diff --git a/Cargo.lock b/Cargo.lock
index ba1df9e6..91370336 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,291 @@
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+ "futures-core",
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@@ -9,17 +294,57 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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+dependencies = [
+ "libc",
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@@ -56,7 +381,7 @@ version = "1.1.2"
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 dependencies = [
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+ "windows-sys 0.59.0",
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- "windows-sys",
+ "windows-sys 0.59.0",
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+dependencies = [
+ "jobserver",
+ "libc",
+ "shlex",
+]
+
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@@ -97,6 +533,30 @@ dependencies = [
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+ "inout",
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@@ -136,12 +596,363 @@ version = "1.0.3"
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+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
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- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
+ "windows_aarch64_gnullvm 0.52.6",
+ "windows_aarch64_msvc 0.52.6",
+ "windows_i686_gnu 0.52.6",
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- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
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+ "windows_x86_64_gnu 0.52.6",
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+
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@@ -638,24 +2794,48 @@ version = "0.52.6"
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+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
+
 [[package]]
 name = "windows_i686_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
 
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
 
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
 
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.52.6"
@@ -671,6 +2851,42 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "write16"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d1890f4022759daae28ed4fe62859b1236caebfc61ede2f63ed4e695f3f6d936"
+
+[[package]]
+name = "writeable"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e9df38ee2d2c3c5948ea468a8406ff0db0b29ae1ffde1bcf20ef305bcc95c51"
+
+[[package]]
+name = "yoke"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "120e6aef9aa629e3d4f52dc8cc43a015c7724194c97dfaf45180d2daf2b77f40"
+dependencies = [
+ "serde",
+ "stable_deref_trait",
+ "yoke-derive",
+ "zerofrom",
+]
+
+[[package]]
+name = "yoke-derive"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2380878cad4ac9aac1e2435f3eb4020e8374b5f13c296cb75b4620ff8e229154"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.90",
+ "synstructure",
+]
+
 [[package]]
 name = "zerocopy"
 version = "0.7.35"
@@ -691,3 +2907,74 @@ dependencies = [
  "quote",
  "syn 2.0.90",
 ]
+
+[[package]]
+name = "zerofrom"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cff3ee08c995dee1859d998dea82f7374f2826091dd9cd47def953cae446cd2e"
+dependencies = [
+ "zerofrom-derive",
+]
+
+[[package]]
+name = "zerofrom-derive"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "595eed982f7d355beb85837f651fa22e90b3c044842dc7f2c2842c086f295808"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.90",
+ "synstructure",
+]
+
+[[package]]
+name = "zerovec"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa2b893d79df23bfb12d5461018d408ea19dfafe76c2c7ef6d4eba614f8ff079"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6eafa6dfb17584ea3e2bd6e76e0cc15ad7af12b09abdd1ca55961bed9b1063c6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.90",
+]
+
+[[package]]
+name = "zstd"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcf2b778a664581e31e389454a7072dab1647606d44f7feea22cd5abb9c9f3f9"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "7.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54a3ab4db68cea366acc5c897c7b4d4d1b8994a9cd6e6f841f8964566a419059"
+dependencies = [
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.13+zstd.1.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38ff0f21cfee8f97d94cef41359e0c89aa6113028ab0291aa8ca0038995a95aa"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 35e82a14..b10ee36a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ members = [
     "helpers/pagetop-macros",
 
     # PageTop
-    #"pagetop",
+    "pagetop",
 
     # Packages
     #"packages/pagetop-aliner",
@@ -25,7 +25,7 @@ authors = ["Manuel Cillero <manuel@cillero.es>"]
 
 [workspace.dependencies]
 #include_dir = "0.7.4"
-#serde = { version = "1.0", features = ["derive"] }
+serde = { version = "1.0", features = ["derive"] }
 static-files = "0.2.4"
 
 # Helpers
@@ -33,7 +33,7 @@ pagetop-build = { version = "0.0", path = "helpers/pagetop-build" }
 pagetop-macros = { version = "0.0", path = "helpers/pagetop-macros" }
 
 # PageTop
-#pagetop = { version = "0.0", path = "pagetop" }
+pagetop = { version = "0.0", path = "pagetop" }
 
 # Packages
 #pagetop-aliner = { version = "0.0", path = "packages/pagetop-aliner" }
diff --git a/README.md b/README.md
index 676f9ffc..e7f8731c 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,114 @@
-# Un nuevo comienzo
+<div align="center">
+
+<img src="https://raw.githubusercontent.com/manuelcillero/pagetop/main/static/banner.png" />
+
+<h1>PageTop</h1>
+
+<p>Entorno de desarrollo para crear soluciones web modulares, extensibles y configurables.</p>
+
+[![Licencia](https://img.shields.io/badge/license-MIT%2FApache-blue.svg?label=Licencia&style=for-the-badge)](#-license)
+[![Doc API](https://img.shields.io/docsrs/pagetop?label=Doc%20API&style=for-the-badge&logo=Docs.rs)](https://docs.rs/pagetop)
+[![Crates.io](https://img.shields.io/crates/v/pagetop.svg?style=for-the-badge&logo=ipfs)](https://crates.io/crates/pagetop)
+[![Descargas](https://img.shields.io/crates/d/pagetop.svg?label=Descargas&style=for-the-badge&logo=transmission)](https://crates.io/crates/pagetop)
+
+</div>
+
+## Presentación
+
+**PageTop** reúne algunos de los *crates* más estables y populares del ecosistema Rust para
+proporcionar un conjunto completo de funcionalidades que pueden extenderse y adaptarse a las
+necesidades específicas de cada aplicación web.
+
+PageTop reivindica la sencillez de la web clásica aplicando *renderizado en el servidor* (SSR),
+HTML, CSS y JS, mediante acciones, componentes, paquetes y temas:
+
+  * **Acciones**. Las funciones y procedimientos que incorporen *acciones* en su lógica de programa
+    estarán proporcionando a los desarrolladores herramientas para alterar su comportamiento interno
+    interceptando su flujo de ejecución.
+  * **Componentes**. Encapsulan HTML, CSS y JavaScript en unidades funcionales, configurables y bien
+    definidas.
+  * **Paquetes**. Extienden o personalizan funcionalidades existentes interactuando con las APIs de
+    PageTop o de paquetes de terceros.
+  * **Temas**. Permiten a los desarrolladores alterar la apariencia de las páginas y componentes sin
+    afectar su funcionalidad.
+
+
+# ⚡️ Inicio rápido
+
+La aplicación más sencilla de PageTop se ve así:
+
+```rust
+use pagetop::prelude::*;
+
+#[pagetop::main]
+async fn main() -> std::io::Result<()> {
+    Application::new().run()?.await
+}
+```
+
+Proporciona una página de bienvenida en `http://localhost:8088` según la configuración predefinida.
+Para personalizar el servicio puedes crear un paquete de PageTop:
+
+```rust
+use pagetop::prelude::*;
+
+struct HelloWorld;
+
+impl PackageTrait for HelloWorld {
+    fn configure_service(&self, scfg: &mut service::web::ServiceConfig) {
+        scfg.route("/", service::web::get().to(hello_world));
+    }
+}
+
+async fn hello_world(request: HttpRequest) -> ResultPage<Markup, ErrorPage> {
+    Page::new(request)
+        .with_component(Html::with(html! { h1 { "Hello world!" } }))
+        .render()
+}
+
+#[pagetop::main]
+async fn main() -> std::io::Result<()> {
+    Application::prepare(&HelloWorld).run()?.await
+}
+```
+
+Este programa prepara un paquete personalizado llamado `HelloWorld` que sirve una página web en la
+ruta raíz (`/`) mostrando el mensaje "Hello world!" en un elemento HTML `<h1>`.
+
+
+# 📂 Crates de ayuda
+
+  * [pagetop-macros](https://github.com/manuelcillero/pagetop/tree/latest/helpers/pagetop-macros):
+    Proporciona una colección de macros que mejoran la experiencia de desarrollo con PageTop.
+
+  * [pagetop-build](https://github.com/manuelcillero/pagetop/tree/latest/helpers/pagetop-build):
+    Permite incluir fácilmente archivos estáticos o archivos SCSS compilados, directamente en el
+    binario de las aplicaciones PageTop.
+
+
+# 🚧 Advertencia
+
+**PageTop** es un proyecto personal que se encuentra en desarrollo activo. Actualmente su API es
+inestable y está sujeta a cambios frecuentes. No se recomienda su uso en producción, al menos hasta
+que alcance la versión **0.1.0**.
+
+
+# 📜 Licencia
+
+El código está disponible bajo una doble licencia:
+
+  * **Licencia MIT**
+    ([LICENSE-MIT](LICENSE-MIT) or https://opensource.org/licenses/MIT)
+
+  * **Licencia Apache, Versión 2.0**
+    ([LICENSE-APACHE](LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)
+
+Puedes elegir la licencia que prefieras. Este enfoque de doble licencia es el estándar de facto en
+el ecosistema Rust.
+
+
+# ✨ Contribuciones
+
+Cualquier contribución para añadir al proyecto se considerará automáticamente bajo la doble licencia
+indicada arriba (MIT o Apache v2.0), sin términos o condiciones adicionales, tal y como permite la
+licencia *Apache v2.0*.
diff --git a/helpers/pagetop-build/README.md b/helpers/pagetop-build/README.md
index 133200e8..c5ecd712 100644
--- a/helpers/pagetop-build/README.md
+++ b/helpers/pagetop-build/README.md
@@ -14,7 +14,7 @@
 # 📦 Sobre PageTop
 
 [PageTop](https://docs.rs/pagetop) es un entorno de desarrollo con convenciones que reivindican la
-web clásica aplicando *renderizado en el servidor* (SSR), HTML, CSS y JS.
+sencillez de la web clásica aplicando *renderizado en el servidor* (SSR), HTML, CSS y JS.
 
 
 # 🚧 Advertencia
diff --git a/helpers/pagetop-macros/Cargo.toml b/helpers/pagetop-macros/Cargo.toml
index 66d71014..1f107111 100644
--- a/helpers/pagetop-macros/Cargo.toml
+++ b/helpers/pagetop-macros/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.0.14"
 edition = "2021"
 
 description = """\
-    Una colección de macros que impulsan el desarrollo con PageTop.\
+    Una colección de macros que mejoran la experiencia de desarrollo con PageTop.\
 """
 categories = ["development-tools::procedural-macro-helpers", "web-programming"]
 keywords = ["pagetop", "macros", "proc-macros", "codegen"]
diff --git a/helpers/pagetop-macros/README.md b/helpers/pagetop-macros/README.md
index da83f592..5f268c84 100644
--- a/helpers/pagetop-macros/README.md
+++ b/helpers/pagetop-macros/README.md
@@ -2,7 +2,7 @@
 
 <h1>PageTop Macros</h1>
 
-<p>Una colección de macros que impulsan el desarrollo con <strong>PageTop</strong>.</p>
+<p>Una colección de macros que mejoran la experiencia de desarrollo con <strong>PageTop</strong>.</p>
 
 [![Licencia](https://img.shields.io/badge/license-MIT%2FApache-blue.svg?label=Licencia&style=for-the-badge)](#-license)
 [![Doc API](https://img.shields.io/docsrs/pagetop-macros?label=Doc%20API&style=for-the-badge&logo=Docs.rs)](https://docs.rs/pagetop-macros)
@@ -14,7 +14,7 @@
 # 📦 Sobre PageTop
 
 [PageTop](https://docs.rs/pagetop) es un entorno de desarrollo con convenciones que reivindican la
-web clásica aplicando *renderizado en el servidor* (SSR), HTML, CSS y JS.
+sencillez de la web clásica aplicando *renderizado en el servidor* (SSR), HTML, CSS y JS.
 
 
 # 🚧 Advertencia
diff --git a/pagetop/Cargo.toml b/pagetop/Cargo.toml
new file mode 100644
index 00000000..e60a8de7
--- /dev/null
+++ b/pagetop/Cargo.toml
@@ -0,0 +1,48 @@
+[package]
+name = "pagetop"
+version = "0.0.57"
+edition = "2021"
+
+description = """\
+    Entorno de desarrollo para crear soluciones web modulares, extensibles y configurables.\
+"""
+categories = ["web-programming", "gui", "development-tools", "asynchronous"]
+keywords = ["pagetop", "web", "framework", "frontend", "ssr"]
+readme = "../README.md"
+
+repository.workspace = true
+homepage.workspace = true
+license.workspace = true
+authors.workspace = true
+
+[dependencies]
+chrono = "0.4.38"
+colored = "2.1.0"
+concat-string = "1.0.1"
+figlet-rs = "0.1.5"
+itoa = "1.0.14"
+nom = "7.1.3"
+paste = "1.0.15"
+serde.workspace = true
+substring = "1.4.5"
+terminal_size = "0.4.1"
+toml = "0.8.19"
+
+tracing = "0.1.41"
+tracing-appender = "0.2.3"
+tracing-subscriber = { version = "0.3.19", features = ["json", "env-filter"] }
+tracing-actix-web = "0.7.15"
+
+fluent-templates = "0.11.0"
+unic-langid = { version = "0.9.5", features = ["macros"] }
+
+actix-web = "4.9.0"
+actix-session = { version = "0.10.1", features = ["cookie-session"] }
+actix-web-files = { package = "actix-files", version = "0.6.6" }
+actix-web-static-files = "4.0.1"
+static-files.workspace = true
+
+pagetop-macros.workspace = true
+
+[build-dependencies]
+pagetop-build.workspace = true
diff --git a/pagetop/build.rs b/pagetop/build.rs
new file mode 100644
index 00000000..1450422c
--- /dev/null
+++ b/pagetop/build.rs
@@ -0,0 +1,7 @@
+use pagetop_build::StaticFilesBundle;
+
+fn main() -> std::io::Result<()> {
+    StaticFilesBundle::from_dir("../static", None)
+        .with_name("assets")
+        .build()
+}
diff --git a/pagetop/config/common.toml b/pagetop/config/common.toml
new file mode 100644
index 00000000..d6b30e57
--- /dev/null
+++ b/pagetop/config/common.toml
@@ -0,0 +1,6 @@
+[app]
+name = "Samples"
+#language = "es-ES"
+
+[log]
+tracing = "Debug"
diff --git a/pagetop/config/predefined-settings.toml b/pagetop/config/predefined-settings.toml
new file mode 100644
index 00000000..08571a92
--- /dev/null
+++ b/pagetop/config/predefined-settings.toml
@@ -0,0 +1,40 @@
+[app]
+name = "My App"
+description = "Developed with the amazing PageTop framework."
+# Default theme.
+theme = "Default"
+# Default language (localization).
+language = "en-US"
+# Default text direction: "ltr", "rtl", or "auto".
+direction = "ltr"
+# Startup banner: "Off", "Slant", "Small", "Speed", or "Starwars".
+startup_banner = "Slant"
+
+[dev]
+# Static files required by the app are integrated by default into the executable
+# binary. However, during development, it can be useful to serve these files
+# from their own directory to avoid recompiling every time they are modified. In
+# this case, just indicate the full path to the project's root directory.
+pagetop_project_dir = ""
+
+[log]
+# Execution trace: "Error", "Warn", "Info", "Debug", or "Trace".
+# For example: "Error,actix_server::builder=Info,tracing_actix_web=Debug".
+tracing = "Info"
+# In terminal ("Stdout") or files "Daily", "Hourly", "Minutely", or "Endless".
+rolling = "Stdout"
+# Directory for trace files (if rolling != "Stdout").
+path = "log"
+# Prefix for trace files (if rolling != "Stdout").
+prefix = "tracing.log"
+# Traces format: "Full", "Compact", "Pretty", or "Json".
+format = "Full"
+
+[server]
+# Web server config.
+bind_address = "localhost"
+bind_port = 8088
+# Session cookie duration (in seconds), i.e., the time from when the session is
+# created until the cookie expires. A value of 0 indicates "until the browser is
+# closed". By default, it is one week.
+session_lifetime = 604800
diff --git a/pagetop/examples/app-basic.rs b/pagetop/examples/app-basic.rs
new file mode 100644
index 00000000..53743870
--- /dev/null
+++ b/pagetop/examples/app-basic.rs
@@ -0,0 +1,6 @@
+use pagetop::prelude::*;
+
+#[pagetop::main]
+async fn main() -> std::io::Result<()> {
+    Application::new().run()?.await
+}
diff --git a/pagetop/examples/hello-name.rs b/pagetop/examples/hello-name.rs
new file mode 100644
index 00000000..3a03e8b1
--- /dev/null
+++ b/pagetop/examples/hello-name.rs
@@ -0,0 +1,25 @@
+use pagetop::prelude::*;
+
+struct HelloName;
+
+impl PackageTrait for HelloName {
+    fn configure_service(&self, scfg: &mut service::web::ServiceConfig) {
+        scfg.service(hello_name);
+    }
+}
+
+#[service::get("/hello/{name}")]
+async fn hello_name(
+    request: HttpRequest,
+    path: service::web::Path<String>,
+) -> ResultPage<Markup, ErrorPage> {
+    let name = path.into_inner();
+    Page::new(request)
+        .with_component(Html::with(html! { h1 { "Hello " (name) "!" } }))
+        .render()
+}
+
+#[pagetop::main]
+async fn main() -> std::io::Result<()> {
+    Application::prepare(&HelloName).run()?.await
+}
diff --git a/pagetop/examples/hello-world.rs b/pagetop/examples/hello-world.rs
new file mode 100644
index 00000000..17c1e9d3
--- /dev/null
+++ b/pagetop/examples/hello-world.rs
@@ -0,0 +1,20 @@
+use pagetop::prelude::*;
+
+struct HelloWorld;
+
+impl PackageTrait for HelloWorld {
+    fn configure_service(&self, scfg: &mut service::web::ServiceConfig) {
+        scfg.route("/", service::web::get().to(hello_world));
+    }
+}
+
+async fn hello_world(request: HttpRequest) -> ResultPage<Markup, ErrorPage> {
+    Page::new(request)
+        .with_component(Html::with(html! { h1 { "Hello World!" } }))
+        .render()
+}
+
+#[pagetop::main]
+async fn main() -> std::io::Result<()> {
+    Application::prepare(&HelloWorld).run()?.await
+}
diff --git a/pagetop/src/app.rs b/pagetop/src/app.rs
new file mode 100644
index 00000000..7c5b8930
--- /dev/null
+++ b/pagetop/src/app.rs
@@ -0,0 +1,168 @@
+//! Prepare and run an application created with **Pagetop**.
+
+mod figfont;
+
+use crate::core::{package, package::PackageRef};
+use crate::html::Markup;
+use crate::response::page::{ErrorPage, ResultPage};
+use crate::service::HttpRequest;
+use crate::{global, locale, service, trace};
+
+use actix_session::config::{BrowserSession, PersistentSession, SessionLifecycle};
+use actix_session::storage::CookieSessionStore;
+use actix_session::SessionMiddleware;
+
+use substring::Substring;
+
+use std::io::Error;
+use std::sync::LazyLock;
+
+pub struct Application;
+
+impl Default for Application {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Application {
+    /// Creates a new application instance without any package.
+    pub fn new() -> Self {
+        Self::internal_prepare(None)
+    }
+
+    /// Prepares an application instance with a specific package.
+    pub fn prepare(root_package: PackageRef) -> Self {
+        Self::internal_prepare(Some(root_package))
+    }
+
+    // Internal method to prepare the application, optionally with a package.
+    fn internal_prepare(root_package: Option<PackageRef>) -> Self {
+        // On startup, show the application banner.
+        Self::show_banner();
+
+        // Starts logging and event tracing.
+        LazyLock::force(&trace::TRACING);
+
+        // Validates the default language identifier.
+        LazyLock::force(&locale::DEFAULT_LANGID);
+
+        // Registers the application's packages.
+        package::all::register_packages(root_package);
+
+        // Registers package actions.
+        package::all::register_actions();
+
+        // Initializes the packages.
+        package::all::init_packages();
+
+        Self
+    }
+
+    // Displays the application banner based on the configuration.
+    fn show_banner() {
+        use colored::Colorize;
+        use terminal_size::{terminal_size, Width};
+
+        if global::SETTINGS.app.startup_banner.to_lowercase() != "off" {
+            // Application name, formatted for the terminal width if necessary.
+            let mut app_ff = "".to_string();
+            let app_name = &global::SETTINGS.app.name;
+            if let Some((Width(term_width), _)) = terminal_size() {
+                if term_width >= 80 {
+                    let maxlen: usize = ((term_width / 10) - 2).into();
+                    let mut app = app_name.substring(0, maxlen).to_owned();
+                    if app_name.len() > maxlen {
+                        app = format!("{app}...");
+                    }
+                    if let Some(ff) = figfont::FIGFONT.convert(&app) {
+                        app_ff = ff.to_string();
+                    }
+                }
+            }
+            if app_ff.is_empty() {
+                println!("\n{app_name}");
+            } else {
+                print!("\n{app_ff}");
+            }
+
+            // Application description.
+            if !global::SETTINGS.app.description.is_empty() {
+                println!("{}", global::SETTINGS.app.description.cyan());
+            };
+
+            // PageTop version.
+            println!(
+                "{} {}\n",
+                "Powered by PageTop".yellow(),
+                env!("CARGO_PKG_VERSION").yellow()
+            );
+        }
+    }
+
+    /// Starts the web server.
+    pub fn run(self) -> Result<service::Server, Error> {
+        // Generate the cookie key.
+        let secret_key = service::cookie::Key::generate();
+
+        // Prepares the web server.
+        Ok(service::HttpServer::new(move || {
+            Self::service_app()
+                .wrap(tracing_actix_web::TracingLogger::default())
+                .wrap(
+                    SessionMiddleware::builder(CookieSessionStore::default(), secret_key.clone())
+                        .session_lifecycle(match global::SETTINGS.server.session_lifetime {
+                            0 => SessionLifecycle::BrowserSession(BrowserSession::default()),
+                            _ => SessionLifecycle::PersistentSession(
+                                PersistentSession::default().session_ttl(
+                                    service::cookie::time::Duration::seconds(
+                                        global::SETTINGS.server.session_lifetime,
+                                    ),
+                                ),
+                            ),
+                        })
+                        .build(),
+                )
+        })
+        .bind(format!(
+            "{}:{}",
+            &global::SETTINGS.server.bind_address,
+            &global::SETTINGS.server.bind_port
+        ))?
+        .run())
+    }
+
+    /// Method for testing, returns a service application instance.
+    pub fn test(
+        self,
+    ) -> service::App<
+        impl service::Factory<
+            service::Request,
+            Config = (),
+            Response = service::Response<service::BoxBody>,
+            Error = service::Error,
+            InitError = (),
+        >,
+    > {
+        Self::service_app()
+    }
+
+    // Configures the service application.
+    fn service_app() -> service::App<
+        impl service::Factory<
+            service::Request,
+            Config = (),
+            Response = service::Response<service::BoxBody>,
+            Error = service::Error,
+            InitError = (),
+        >,
+    > {
+        service::App::new()
+            .configure(package::all::configure_services)
+            .default_service(service::web::route().to(service_not_found))
+    }
+}
+
+async fn service_not_found(request: HttpRequest) -> ResultPage<Markup, ErrorPage> {
+    Err(ErrorPage::NotFound(request))
+}
diff --git a/pagetop/src/app/figfont.rs b/pagetop/src/app/figfont.rs
new file mode 100644
index 00000000..1da9d9b9
--- /dev/null
+++ b/pagetop/src/app/figfont.rs
@@ -0,0 +1,30 @@
+use crate::global;
+
+use std::sync::LazyLock;
+
+use figlet_rs::FIGfont;
+
+pub static FIGFONT: LazyLock<FIGfont> = LazyLock::new(|| {
+    let slant = include_str!("slant.flf");
+    let small = include_str!("small.flf");
+    let speed = include_str!("speed.flf");
+    let starwars = include_str!("starwars.flf");
+
+    FIGfont::from_content(
+        match global::SETTINGS.app.startup_banner.to_lowercase().as_str() {
+            "off" => slant,
+            "slant" => slant,
+            "small" => small,
+            "speed" => speed,
+            "starwars" => starwars,
+            _ => {
+                println!(
+                    "\n FIGfont \"{}\" not found for banner. Using \"Slant\". Check settings files.",
+                    global::SETTINGS.app.startup_banner,
+                );
+                slant
+            }
+        },
+    )
+    .unwrap()
+});
diff --git a/pagetop/src/app/slant.flf b/pagetop/src/app/slant.flf
new file mode 100644
index 00000000..ea27b6ed
--- /dev/null
+++ b/pagetop/src/app/slant.flf
@@ -0,0 +1,1295 @@
+flf2a$ 6 5 16 15 10 0 18319
+Slant by Glenn Chappell 3/93 -- based on Standard
+Includes ISO Latin-1
+figlet release 2.1 -- 12 Aug 1994
+Permission is hereby given to modify this font, as long as the
+modifier's name is placed on a comment line.
+
+Modified by Paul Burton <solution@earthlink.net> 12/96 to include new parameter
+supported by FIGlet and FIGWin.  May also be slightly modified for better use
+of new full-width/kern/smush alternatives, but default output is NOT changed.
+
+     $$@
+    $$ @
+   $$  @
+  $$   @
+ $$    @
+$$     @@
+    __@
+   / /@
+  / / @
+ /_/  @
+(_)   @
+      @@
+ _ _ @
+( | )@
+|/|/ @
+ $   @
+$    @
+     @@
+     __ __ @
+  __/ // /_@
+ /_  _  __/@
+/_  _  __/ @
+ /_//_/    @
+           @@
+     __@
+   _/ /@
+  / __/@
+ (_  ) @
+/  _/  @
+/_/    @@
+   _   __@
+  (_)_/_/@
+   _/_/  @
+ _/_/_   @
+/_/ (_)  @
+         @@
+   ___   @
+  ( _ )  @
+ / __ \/|@
+/ /_/  < @
+\____/\/ @
+         @@
+  _ @
+ ( )@
+ |/ @
+ $  @
+$   @
+    @@
+     __@
+   _/_/@
+  / /  @
+ / /   @
+/ /    @
+|_|    @@
+     _ @
+    | |@
+    / /@
+   / / @
+ _/_/  @
+/_/    @@
+       @
+  __/|_@
+ |    /@
+/_ __| @
+ |/    @
+       @@
+       @
+    __ @
+ __/ /_@
+/_  __/@
+ /_/   @
+       @@
+   @
+   @
+   @
+ _ @
+( )@
+|/ @@
+       @
+       @
+ ______@
+/_____/@
+  $    @
+       @@
+   @
+   @
+   @
+ _ @
+(_)@
+   @@
+       __@
+     _/_/@
+   _/_/  @
+ _/_/    @
+/_/      @
+         @@
+   ____ @
+  / __ \@
+ / / / /@
+/ /_/ / @
+\____/  @
+        @@
+   ___@
+  <  /@
+  / / @
+ / /  @
+/_/   @
+      @@
+   ___ @
+  |__ \@
+  __/ /@
+ / __/ @
+/____/ @
+       @@
+   _____@
+  |__  /@
+   /_ < @
+ ___/ / @
+/____/  @
+        @@
+   __ __@
+  / // /@
+ / // /_@
+/__  __/@
+  /_/   @
+        @@
+    ______@
+   / ____/@
+  /___ \  @
+ ____/ /  @
+/_____/   @
+          @@
+   _____@
+  / ___/@
+ / __ \ @
+/ /_/ / @
+\____/  @
+        @@
+ _____@
+/__  /@
+  / / @
+ / /  @
+/_/   @
+      @@
+   ____ @
+  ( __ )@
+ / __  |@
+/ /_/ / @
+\____/  @
+        @@
+   ____ @
+  / __ \@
+ / /_/ /@
+ \__, / @
+/____/  @
+        @@
+     @
+   _ @
+  (_)@
+ _   @
+(_)  @
+     @@
+     @
+   _ @
+  (_)@
+ _   @
+( )  @
+|/   @@
+  __@
+ / /@
+/ / @
+\ \ @
+ \_\@
+    @@
+       @
+  _____@
+ /____/@
+/____/ @
+  $    @
+       @@
+__  @
+\ \ @
+ \ \@
+ / /@
+/_/ @
+    @@
+  ___ @
+ /__ \@
+  / _/@
+ /_/  @
+(_)   @
+      @@
+   ______ @
+  / ____ \@
+ / / __ `/@
+/ / /_/ / @
+\ \__,_/  @
+ \____/   @@
+    ___ @
+   /   |@
+  / /| |@
+ / ___ |@
+/_/  |_|@
+        @@
+    ____ @
+   / __ )@
+  / __  |@
+ / /_/ / @
+/_____/  @
+         @@
+   ______@
+  / ____/@
+ / /     @
+/ /___   @
+\____/   @
+         @@
+    ____ @
+   / __ \@
+  / / / /@
+ / /_/ / @
+/_____/  @
+         @@
+    ______@
+   / ____/@
+  / __/   @
+ / /___   @
+/_____/   @
+          @@
+    ______@
+   / ____/@
+  / /_    @
+ / __/    @
+/_/       @
+          @@
+   ______@
+  / ____/@
+ / / __  @
+/ /_/ /  @
+\____/   @
+         @@
+    __  __@
+   / / / /@
+  / /_/ / @
+ / __  /  @
+/_/ /_/   @
+          @@
+    ____@
+   /  _/@
+   / /  @
+ _/ /   @
+/___/   @
+        @@
+       __@
+      / /@
+ __  / / @
+/ /_/ /  @
+\____/   @
+         @@
+    __ __@
+   / //_/@
+  / ,<   @
+ / /| |  @
+/_/ |_|  @
+         @@
+    __ @
+   / / @
+  / /  @
+ / /___@
+/_____/@
+       @@
+    __  ___@
+   /  |/  /@
+  / /|_/ / @
+ / /  / /  @
+/_/  /_/   @
+           @@
+    _   __@
+   / | / /@
+  /  |/ / @
+ / /|  /  @
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+          @@
+   ____ @
+  / __ \@
+ / / / /@
+/ /_/ / @
+\____/  @
+        @@
+    ____ @
+   / __ \@
+  / /_/ /@
+ / ____/ @
+/_/      @
+         @@
+   ____ @
+  / __ \@
+ / / / /@
+/ /_/ / @
+\___\_\ @
+        @@
+    ____ @
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+ / _, _/ @
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+         @@
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+  / ___/@
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+/____/  @
+        @@
+  ______@
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+ / /    @
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+        @@
+   __  __@
+  / / / /@
+ / / / / @
+/ /_/ /  @
+\____/   @
+         @@
+ _    __@
+| |  / /@
+| | / / @
+| |/ /  @
+|___/   @
+        @@
+ _       __@
+| |     / /@
+| | /| / / @
+| |/ |/ /  @
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+   _  __@
+  | |/ /@
+  |   / @
+ /   |  @
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+        @@
+__  __@
+\ \/ /@
+ \  / @
+ / /  @
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+  / / @
+ / /__@
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+      @@
+     ___@
+    / _/@
+   / /  @
+  / /   @
+ / /    @
+/__/    @@
+__    @
+\ \   @
+ \ \  @
+  \ \ @
+   \_\@
+      @@
+     ___@
+    /  /@
+    / / @
+   / /  @
+ _/ /   @
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+  //|@
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+ ______@
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+  _ @
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+    @@
+        @
+  ____ _@
+ / __ `/@
+/ /_/ / @
+\__,_/  @
+        @@
+    __  @
+   / /_ @
+  / __ \@
+ / /_/ /@
+/_.___/ @
+        @@
+       @
+  _____@
+ / ___/@
+/ /__  @
+\___/  @
+       @@
+       __@
+  ____/ /@
+ / __  / @
+/ /_/ /  @
+\__,_/   @
+         @@
+      @
+  ___ @
+ / _ \@
+/  __/@
+\___/ @
+      @@
+    ____@
+   / __/@
+  / /_  @
+ / __/  @
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+        @@
+         @
+   ____ _@
+  / __ `/@
+ / /_/ / @
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+    __  @
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+  / __ \@
+ / / / /@
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+        @@
+    _ @
+   (_)@
+  / / @
+ / /  @
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+      @@
+       _ @
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+    / /  @
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+    __  @
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+    __@
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+  / / @
+ / /  @
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+            @@
+        @
+   ____ @
+  / __ \@
+ / / / /@
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+        @@
+       @
+  ____ @
+ / __ \@
+/ /_/ /@
+\____/ @
+       @@
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+  / /_/ /@
+ / .___/ @
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+        @
+  ____ _@
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+/ /_/ / @
+\__, /  @
+  /_/   @@
+        @
+   _____@
+  / ___/@
+ / /    @
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+        @@
+        @
+   _____@
+  / ___/@
+ (__  ) @
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+        @@
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+  / /_@
+ / __/@
+/ /_  @
+\__/  @
+      @@
+        @
+  __  __@
+ / / / /@
+/ /_/ / @
+\__,_/  @
+        @@
+       @
+ _   __@
+| | / /@
+| |/ / @
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+       @@
+          @
+ _      __@
+| | /| / /@
+| |/ |/ / @
+|__/|__/  @
+          @@
+        @
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+  | |/_/@
+ _>  <  @
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+        @@
+         @
+   __  __@
+  / / / /@
+ / /_/ / @
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+     @
+ ____@
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+ / /_@
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+     @@
+     __@
+   _/_/@
+ _/_/  @
+< <    @
+/ /    @
+\_\    @@
+     __@
+    / /@
+   / / @
+  / /  @
+ / /   @
+/_/    @@
+     _ @
+    | |@
+    / /@
+   _>_>@
+ _/_/  @
+/_/    @@
+  /\//@
+ //\/ @
+  $   @
+ $    @
+$     @
+      @@
+    _  _ @
+   (_)(_)@
+  / _ |  @
+ / __ |  @
+/_/ |_|  @
+         @@
+   _   _ @
+  (_)_(_)@
+ / __ \  @
+/ /_/ /  @
+\____/   @
+         @@
+   _   _ @
+  (_) (_)@
+ / / / / @
+/ /_/ /  @
+\____/   @
+         @@
+   _   _ @
+  (_)_(_)@
+ / __ `/ @
+/ /_/ /  @
+\__,_/   @
+         @@
+   _   _ @
+  (_)_(_)@
+ / __ \  @
+/ /_/ /  @
+\____/   @
+         @@
+   _   _ @
+  (_) (_)@
+ / / / / @
+/ /_/ /  @
+\__,_/   @
+         @@
+     ____ @
+    / __ \@
+   / / / /@
+  / /_| | @
+ / //__/  @
+/_/       @@
+160  NO-BREAK SPACE
+     $$@
+    $$ @
+   $$  @
+  $$   @
+ $$    @
+$$     @@
+161  INVERTED EXCLAMATION MARK
+    _ @
+   (_)@
+  / / @
+ / /  @
+/_/   @
+      @@
+162  CENT SIGN
+     __@
+  __/ /@
+ / ___/@
+/ /__  @
+\  _/  @
+/_/    @@
+163  POUND SIGN
+     ____ @
+    / ,__\@
+ __/ /_   @
+ _/ /___  @
+(_,____/  @
+          @@
+164  CURRENCY SIGN
+    /|___/|@
+   | __  / @
+  / /_/ /  @
+ /___  |   @
+|/   |/    @
+           @@
+165  YEN SIGN
+    ____@
+  _| / /@
+ /_  __/@
+/_  __/ @
+ /_/    @
+        @@
+166  BROKEN BAR
+     __@
+    / /@
+   /_/ @
+  __   @
+ / /   @
+/_/    @@
+167  SECTION SIGN
+     __ @
+   _/ _)@
+  / | | @
+ | || | @
+ | |_/  @
+(__/    @@
+168  DIAERESIS
+  _   _ @
+ (_) (_)@
+  $   $ @
+ $   $  @
+$   $   @
+        @@
+169  COPYRIGHT SIGN
+    ______  @
+   / _____\ @
+  / / ___/ |@
+ / / /__  / @
+|  \___/ /  @
+ \______/   @@
+170  FEMININE ORDINAL INDICATOR
+   ___ _@
+  / _ `/@
+ _\_,_/ @
+/____/  @
+ $      @
+        @@
+171  LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
+  ____@
+ / / /@
+/ / / @
+\ \ \ @
+ \_\_\@
+      @@
+172  NOT SIGN
+       @
+ ______@
+/___  /@
+   /_/ @
+ $     @
+       @@
+173  SOFT HYPHEN
+      @
+      @
+ _____@
+/____/@
+  $   @
+      @@
+174  REGISTERED SIGN
+    ______  @
+   / ___  \ @
+  / / _ \  |@
+ / / , _/ / @
+| /_/|_| /  @
+ \______/   @@
+175  MACRON
+ ______@
+/_____/@
+  $    @
+ $     @
+$      @
+       @@
+176  DEGREE SIGN
+  ___ @
+ / _ \@
+/ // /@
+\___/ @
+ $    @
+      @@
+177  PLUS-MINUS SIGN
+      __ @
+   __/ /_@
+  /_  __/@
+ __/_/_  @
+/_____/  @
+         @@
+178  SUPERSCRIPT TWO
+   ___ @
+  |_  |@
+ / __/ @
+/____/ @
+ $     @
+       @@
+179  SUPERSCRIPT THREE
+   ____@
+  |_  /@
+ _/_ < @
+/____/ @
+ $     @
+       @@
+180  ACUTE ACCENT
+  __@
+ /_/@
+  $ @
+ $  @
+$   @
+    @@
+181  MICRO SIGN
+          @
+    __  __@
+   / / / /@
+  / /_/ / @
+ / ._,_/  @
+/_/       @@
+182  PILCROW SIGN
+  _______@
+ / _    /@
+/ (/ / / @
+\_  / /  @
+ /_/_/   @
+         @@
+183  MIDDLE DOT
+   @
+ _ @
+(_)@
+ $ @
+$  @
+   @@
+184  CEDILLA
+   @
+   @
+   @
+   @
+ _ @
+/_)@@
+185  SUPERSCRIPT ONE
+  ___@
+ <  /@
+ / / @
+/_/  @
+$    @
+     @@
+186  MASCULINE ORDINAL INDICATOR
+   ___ @
+  / _ \@
+ _\___/@
+/____/ @
+ $     @
+       @@
+187  RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
+____  @
+\ \ \ @
+ \ \ \@
+ / / /@
+/_/_/ @
+      @@
+188  VULGAR FRACTION ONE QUARTER
+  ___   __ @
+ <  / _/_/ @
+ / /_/_/___@
+/_//_// / /@
+ /_/ /_  _/@
+      /_/  @@
+189  VULGAR FRACTION ONE HALF
+  ___   __   @
+ <  / _/_/__ @
+ / /_/_/|_  |@
+/_//_/ / __/ @
+ /_/  /____/ @
+             @@
+190  VULGAR FRACTION THREE QUARTERS
+   ____    __ @
+  |_  /  _/_/ @
+ _/_ < _/_/___@
+/____//_// / /@
+    /_/ /_  _/@
+         /_/  @@
+191  INVERTED QUESTION MARK
+    _ @
+   (_)@
+ _/ / @
+/ _/_ @
+\___/ @
+      @@
+192  LATIN CAPITAL LETTER A WITH GRAVE
+    __ @
+   _\_\@
+  / _ |@
+ / __ |@
+/_/ |_|@
+       @@
+193  LATIN CAPITAL LETTER A WITH ACUTE
+     __@
+   _/_/@
+  / _ |@
+ / __ |@
+/_/ |_|@
+       @@
+194  LATIN CAPITAL LETTER A WITH CIRCUMFLEX
+     //|@
+   _|/||@
+  / _ | @
+ / __ | @
+/_/ |_| @
+        @@
+195  LATIN CAPITAL LETTER A WITH TILDE
+     /\//@
+   _//\/ @
+  / _ |  @
+ / __ |  @
+/_/ |_|  @
+         @@
+196  LATIN CAPITAL LETTER A WITH DIAERESIS
+    _  _ @
+   (_)(_)@
+  / _ |  @
+ / __ |  @
+/_/ |_|  @
+         @@
+197  LATIN CAPITAL LETTER A WITH RING ABOVE
+    (())@
+   /   |@
+  / /| |@
+ / ___ |@
+/_/  |_|@
+        @@
+198  LATIN CAPITAL LETTER AE
+    __________@
+   /     ____/@
+  / /|  __/   @
+ / __  /___   @
+/_/ /_____/   @
+              @@
+199  LATIN CAPITAL LETTER C WITH CEDILLA
+   ______@
+  / ____/@
+ / /     @
+/ /___   @
+\____/   @
+ /_)     @@
+200  LATIN CAPITAL LETTER E WITH GRAVE
+    __ @
+   _\_\@
+  / __/@
+ / _/  @
+/___/  @
+       @@
+201  LATIN CAPITAL LETTER E WITH ACUTE
+     __@
+   _/_/@
+  / __/@
+ / _/  @
+/___/  @
+       @@
+202  LATIN CAPITAL LETTER E WITH CIRCUMFLEX
+     //|@
+   _|/||@
+  / __/ @
+ / _/   @
+/___/   @
+        @@
+203  LATIN CAPITAL LETTER E WITH DIAERESIS
+    _  _ @
+   (_)(_)@
+  / __/  @
+ / _/    @
+/___/    @
+         @@
+204  LATIN CAPITAL LETTER I WITH GRAVE
+    __ @
+   _\_\@
+  /  _/@
+ _/ /  @
+/___/  @
+       @@
+205  LATIN CAPITAL LETTER I WITH ACUTE
+     __@
+   _/_/@
+  /  _/@
+ _/ /  @
+/___/  @
+       @@
+206  LATIN CAPITAL LETTER I WITH CIRCUMFLEX
+     //|@
+   _|/||@
+  /  _/ @
+ _/ /   @
+/___/   @
+        @@
+207  LATIN CAPITAL LETTER I WITH DIAERESIS
+    _  _ @
+   (_)(_)@
+  /  _/  @
+ _/ /    @
+/___/    @
+         @@
+208  LATIN CAPITAL LETTER ETH
+     ____ @
+    / __ \@
+ __/ /_/ /@
+/_  __/ / @
+ /_____/  @
+          @@
+209  LATIN CAPITAL LETTER N WITH TILDE
+     /\//@
+   _//\/ @
+  / |/ / @
+ /    /  @
+/_/|_/   @
+         @@
+210  LATIN CAPITAL LETTER O WITH GRAVE
+    __ @
+  __\_\@
+ / __ \@
+/ /_/ /@
+\____/ @
+       @@
+211  LATIN CAPITAL LETTER O WITH ACUTE
+     __@
+  __/_/@
+ / __ \@
+/ /_/ /@
+\____/ @
+       @@
+212  LATIN CAPITAL LETTER O WITH CIRCUMFLEX
+    //|@
+  _|/||@
+ / __ \@
+/ /_/ /@
+\____/ @
+       @@
+213  LATIN CAPITAL LETTER O WITH TILDE
+    /\//@
+  _//\/ @
+ / __ \ @
+/ /_/ / @
+\____/  @
+        @@
+214  LATIN CAPITAL LETTER O WITH DIAERESIS
+   _   _ @
+  (_)_(_)@
+ / __ \  @
+/ /_/ /  @
+\____/   @
+         @@
+215  MULTIPLICATION SIGN
+     @
+     @
+ /|/|@
+ > < @
+|/|/ @
+     @@
+216  LATIN CAPITAL LETTER O WITH STROKE
+   _____ @
+  / _// \@
+ / //// /@
+/ //// / @
+\_//__/  @
+         @@
+217  LATIN CAPITAL LETTER U WITH GRAVE
+    __  @
+  __\_\_@
+ / / / /@
+/ /_/ / @
+\____/  @
+        @@
+218  LATIN CAPITAL LETTER U WITH ACUTE
+     __ @
+  __/_/_@
+ / / / /@
+/ /_/ / @
+\____/  @
+        @@
+219  LATIN CAPITAL LETTER U WITH CIRCUMFLEX
+    //| @
+  _|/||_@
+ / / / /@
+/ /_/ / @
+\____/  @
+        @@
+220  LATIN CAPITAL LETTER U WITH DIAERESIS
+   _   _ @
+  (_) (_)@
+ / / / / @
+/ /_/ /  @
+\____/   @
+         @@
+221  LATIN CAPITAL LETTER Y WITH ACUTE
+   __ @
+__/_/_@
+\ \/ /@
+ \  / @
+ /_/  @
+      @@
+222  LATIN CAPITAL LETTER THORN
+    __  @
+   / /_ @
+  / __ \@
+ / ____/@
+/_/     @
+        @@
+223  LATIN SMALL LETTER SHARP S
+     ____ @
+    / __ \@
+   / / / /@
+  / /_| | @
+ / //__/  @
+/_/       @@
+224  LATIN SMALL LETTER A WITH GRAVE
+    __  @
+  __\_\_@
+ / __ `/@
+/ /_/ / @
+\__,_/  @
+        @@
+225  LATIN SMALL LETTER A WITH ACUTE
+     __ @
+  __/_/_@
+ / __ `/@
+/ /_/ / @
+\__,_/  @
+        @@
+226  LATIN SMALL LETTER A WITH CIRCUMFLEX
+    //| @
+  _|/||_@
+ / __ `/@
+/ /_/ / @
+\__,_/  @
+        @@
+227  LATIN SMALL LETTER A WITH TILDE
+    /\//@
+  _//\/_@
+ / __ `/@
+/ /_/ / @
+\__,_/  @
+        @@
+228  LATIN SMALL LETTER A WITH DIAERESIS
+   _   _ @
+  (_)_(_)@
+ / __ `/ @
+/ /_/ /  @
+\__,_/   @
+         @@
+229  LATIN SMALL LETTER A WITH RING ABOVE
+     __ @
+  __(())@
+ / __ `/@
+/ /_/ / @
+\__,_/  @
+        @@
+230  LATIN SMALL LETTER AE
+           @
+  ____ ___ @
+ / __ ` _ \@
+/ /_/   __/@
+\__,_____/ @
+           @@
+231  LATIN SMALL LETTER C WITH CEDILLA
+       @
+  _____@
+ / ___/@
+/ /__  @
+\___/  @
+/_)    @@
+232  LATIN SMALL LETTER E WITH GRAVE
+   __ @
+  _\_\@
+ / _ \@
+/  __/@
+\___/ @
+      @@
+233  LATIN SMALL LETTER E WITH ACUTE
+    __@
+  _/_/@
+ / _ \@
+/  __/@
+\___/ @
+      @@
+234  LATIN SMALL LETTER E WITH CIRCUMFLEX
+    //|@
+  _|/||@
+ / _ \ @
+/  __/ @
+\___/  @
+       @@
+235  LATIN SMALL LETTER E WITH DIAERESIS
+   _  _ @
+  (_)(_)@
+ / _ \  @
+/  __/  @
+\___/   @
+        @@
+236  LATIN SMALL LETTER I WITH GRAVE
+   __ @
+   \_\@
+  / / @
+ / /  @
+/_/   @
+      @@
+237  LATIN SMALL LETTER I WITH ACUTE
+    __@
+   /_/@
+  / / @
+ / /  @
+/_/   @
+      @@
+238  LATIN SMALL LETTER I WITH CIRCUMFLEX
+    //|@
+   |/||@
+  / /  @
+ / /   @
+/_/    @
+       @@
+239  LATIN SMALL LETTER I WITH DIAERESIS
+  _   _ @
+ (_)_(_)@
+  / /   @
+ / /    @
+/_/     @
+        @@
+240  LATIN SMALL LETTER ETH
+     || @
+    =||=@
+ ___ || @
+/ __` | @
+\____/  @
+        @@
+241  LATIN SMALL LETTER N WITH TILDE
+     /\//@
+   _//\/ @
+  / __ \ @
+ / / / / @
+/_/ /_/  @
+         @@
+242  LATIN SMALL LETTER O WITH GRAVE
+    __ @
+  __\_\@
+ / __ \@
+/ /_/ /@
+\____/ @
+       @@
+243  LATIN SMALL LETTER O WITH ACUTE
+     __@
+  __/_/@
+ / __ \@
+/ /_/ /@
+\____/ @
+       @@
+244  LATIN SMALL LETTER O WITH CIRCUMFLEX
+    //|@
+  _|/||@
+ / __ \@
+/ /_/ /@
+\____/ @
+       @@
+245  LATIN SMALL LETTER O WITH TILDE
+    /\//@
+  _//\/ @
+ / __ \ @
+/ /_/ / @
+\____/  @
+        @@
+246  LATIN SMALL LETTER O WITH DIAERESIS
+   _   _ @
+  (_)_(_)@
+ / __ \  @
+/ /_/ /  @
+\____/   @
+         @@
+247  DIVISION SIGN
+       @
+    _  @
+ __(_)_@
+/_____/@
+ (_)   @
+       @@
+248  LATIN SMALL LETTER O WITH STROKE
+        @
+  _____ @
+ / _// \@
+/ //// /@
+\_//__/ @
+        @@
+249  LATIN SMALL LETTER U WITH GRAVE
+    __  @
+  __\_\_@
+ / / / /@
+/ /_/ / @
+\__,_/  @
+        @@
+250  LATIN SMALL LETTER U WITH ACUTE
+     __ @
+  __/_/_@
+ / / / /@
+/ /_/ / @
+\__,_/  @
+        @@
+251  LATIN SMALL LETTER U WITH CIRCUMFLEX
+    //| @
+  _|/||_@
+ / / / /@
+/ /_/ / @
+\__,_/  @
+        @@
+252  LATIN SMALL LETTER U WITH DIAERESIS
+   _   _ @
+  (_) (_)@
+ / / / / @
+/ /_/ /  @
+\__,_/   @
+         @@
+253  LATIN SMALL LETTER Y WITH ACUTE
+      __ @
+   __/_/_@
+  / / / /@
+ / /_/ / @
+ \__, /  @
+/____/   @@
+254  LATIN SMALL LETTER THORN
+     __  @
+    / /_ @
+   / __ \@
+  / /_/ /@
+ / .___/ @
+/_/      @@
+255  LATIN SMALL LETTER Y WITH DIAERESIS
+    _   _ @
+   (_) (_)@
+  / / / / @
+ / /_/ /  @
+ \__, /   @
+/____/    @@
diff --git a/pagetop/src/app/small.flf b/pagetop/src/app/small.flf
new file mode 100644
index 00000000..d2a2c49c
--- /dev/null
+++ b/pagetop/src/app/small.flf
@@ -0,0 +1,1097 @@
+flf2a$ 5 4 13 15 10 0 22415
+Small by Glenn Chappell 4/93 -- based on Standard
+Includes ISO Latin-1
+figlet release 2.1 -- 12 Aug 1994
+Permission is hereby given to modify this font, as long as the
+modifier's name is placed on a comment line.
+
+Modified by Paul Burton <solution@earthlink.net> 12/96 to include new parameter
+supported by FIGlet and FIGWin.  May also be slightly modified for better use
+of new full-width/kern/smush alternatives, but default output is NOT changed.
+
+ $@
+ $@
+ $@
+ $@
+ $@@
+  _ @
+ | |@
+ |_|@
+ (_)@
+    @@
+  _ _ @
+ ( | )@
+  V V @
+   $  @
+      @@
+    _ _   @
+  _| | |_ @
+ |_  .  _|@
+ |_     _|@
+   |_|_|  @@
+     @
+  ||_@
+ (_-<@
+ / _/@
+  || @@
+  _  __ @
+ (_)/ / @
+   / /_ @
+  /_/(_)@
+        @@
+  __     @
+ / _|___ @
+ > _|_ _|@
+ \_____| @
+         @@
+  _ @
+ ( )@
+ |/ @
+  $ @
+    @@
+   __@
+  / /@
+ | | @
+ | | @
+  \_\@@
+ __  @
+ \ \ @
+  | |@
+  | |@
+ /_/ @@
+     @
+ _/\_@
+ >  <@
+  \/ @
+     @@
+    _   @
+  _| |_ @
+ |_   _|@
+   |_|  @
+        @@
+    @
+    @
+  _ @
+ ( )@
+ |/ @@
+      @
+  ___ @
+ |___|@
+   $  @
+      @@
+    @
+    @
+  _ @
+ (_)@
+    @@
+    __@
+   / /@
+  / / @
+ /_/  @
+      @@
+   __  @
+  /  \ @
+ | () |@
+  \__/ @
+       @@
+  _ @
+ / |@
+ | |@
+ |_|@
+    @@
+  ___ @
+ |_  )@
+  / / @
+ /___|@
+      @@
+  ____@
+ |__ /@
+  |_ \@
+ |___/@
+      @@
+  _ _  @
+ | | | @
+ |_  _|@
+   |_| @
+       @@
+  ___ @
+ | __|@
+ |__ \@
+ |___/@
+      @@
+   __ @
+  / / @
+ / _ \@
+ \___/@
+      @@
+  ____ @
+ |__  |@
+   / / @
+  /_/  @
+       @@
+  ___ @
+ ( _ )@
+ / _ \@
+ \___/@
+      @@
+  ___ @
+ / _ \@
+ \_, /@
+  /_/ @
+      @@
+  _ @
+ (_)@
+  _ @
+ (_)@
+    @@
+  _ @
+ (_)@
+  _ @
+ ( )@
+ |/ @@
+   __@
+  / /@
+ < < @
+  \_\@
+     @@
+      @
+  ___ @
+ |___|@
+ |___|@
+      @@
+ __  @
+ \ \ @
+  > >@
+ /_/ @
+     @@
+  ___ @
+ |__ \@
+   /_/@
+  (_) @
+      @@
+   ____  @
+  / __ \ @
+ / / _` |@
+ \ \__,_|@
+  \____/ @@
+    _   @
+   /_\  @
+  / _ \ @
+ /_/ \_\@
+        @@
+  ___ @
+ | _ )@
+ | _ \@
+ |___/@
+      @@
+   ___ @
+  / __|@
+ | (__ @
+  \___|@
+       @@
+  ___  @
+ |   \ @
+ | |) |@
+ |___/ @
+       @@
+  ___ @
+ | __|@
+ | _| @
+ |___|@
+      @@
+  ___ @
+ | __|@
+ | _| @
+ |_|  @
+      @@
+   ___ @
+  / __|@
+ | (_ |@
+  \___|@
+       @@
+  _  _ @
+ | || |@
+ | __ |@
+ |_||_|@
+       @@
+  ___ @
+ |_ _|@
+  | | @
+ |___|@
+      @@
+     _ @
+  _ | |@
+ | || |@
+  \__/ @
+       @@
+  _  __@
+ | |/ /@
+ | ' < @
+ |_|\_\@
+       @@
+  _    @
+ | |   @
+ | |__ @
+ |____|@
+       @@
+  __  __ @
+ |  \/  |@
+ | |\/| |@
+ |_|  |_|@
+         @@
+  _  _ @
+ | \| |@
+ | .` |@
+ |_|\_|@
+       @@
+   ___  @
+  / _ \ @
+ | (_) |@
+  \___/ @
+        @@
+  ___ @
+ | _ \@
+ |  _/@
+ |_|  @
+      @@
+   ___  @
+  / _ \ @
+ | (_) |@
+  \__\_\@
+        @@
+  ___ @
+ | _ \@
+ |   /@
+ |_|_\@
+      @@
+  ___ @
+ / __|@
+ \__ \@
+ |___/@
+      @@
+  _____ @
+ |_   _|@
+   | |  @
+   |_|  @
+        @@
+  _   _ @
+ | | | |@
+ | |_| |@
+  \___/ @
+        @@
+ __   __@
+ \ \ / /@
+  \ V / @
+   \_/  @
+        @@
+ __      __@
+ \ \    / /@
+  \ \/\/ / @
+   \_/\_/  @
+           @@
+ __  __@
+ \ \/ /@
+  >  < @
+ /_/\_\@
+       @@
+ __   __@
+ \ \ / /@
+  \ V / @
+   |_|  @
+        @@
+  ____@
+ |_  /@
+  / / @
+ /___|@
+      @@
+  __ @
+ | _|@
+ | | @
+ | | @
+ |__|@@
+ __   @
+ \ \  @
+  \ \ @
+   \_\@
+      @@
+  __ @
+ |_ |@
+  | |@
+  | |@
+ |__|@@
+  /\ @
+ |/\|@
+   $ @
+   $ @
+     @@
+      @
+      @
+      @
+  ___ @
+ |___|@@
+  _ @
+ ( )@
+  \|@
+  $ @
+    @@
+       @
+  __ _ @
+ / _` |@
+ \__,_|@
+       @@
+  _    @
+ | |__ @
+ | '_ \@
+ |_.__/@
+       @@
+     @
+  __ @
+ / _|@
+ \__|@
+     @@
+     _ @
+  __| |@
+ / _` |@
+ \__,_|@
+       @@
+      @
+  ___ @
+ / -_)@
+ \___|@
+      @@
+   __ @
+  / _|@
+ |  _|@
+ |_|  @
+      @@
+       @
+  __ _ @
+ / _` |@
+ \__, |@
+ |___/ @@
+  _    @
+ | |_  @
+ | ' \ @
+ |_||_|@
+       @@
+  _ @
+ (_)@
+ | |@
+ |_|@
+    @@
+    _ @
+   (_)@
+   | |@
+  _/ |@
+ |__/ @@
+  _   @
+ | |__@
+ | / /@
+ |_\_\@
+      @@
+  _ @
+ | |@
+ | |@
+ |_|@
+    @@
+        @
+  _ __  @
+ | '  \ @
+ |_|_|_|@
+        @@
+       @
+  _ _  @
+ | ' \ @
+ |_||_|@
+       @@
+      @
+  ___ @
+ / _ \@
+ \___/@
+      @@
+       @
+  _ __ @
+ | '_ \@
+ | .__/@
+ |_|   @@
+       @
+  __ _ @
+ / _` |@
+ \__, |@
+    |_|@@
+      @
+  _ _ @
+ | '_|@
+ |_|  @
+      @@
+     @
+  ___@
+ (_-<@
+ /__/@
+     @@
+  _   @
+ | |_ @
+ |  _|@
+  \__|@
+      @@
+       @
+  _  _ @
+ | || |@
+  \_,_|@
+       @@
+      @
+ __ __@
+ \ V /@
+  \_/ @
+      @@
+         @
+ __ __ __@
+ \ V  V /@
+  \_/\_/ @
+         @@
+      @
+ __ __@
+ \ \ /@
+ /_\_\@
+      @@
+       @
+  _  _ @
+ | || |@
+  \_, |@
+  |__/ @@
+     @
+  ___@
+ |_ /@
+ /__|@
+     @@
+    __@
+   / /@
+ _| | @
+  | | @
+   \_\@@
+  _ @
+ | |@
+ | |@
+ | |@
+ |_|@@
+ __   @
+ \ \  @
+  | |_@
+  | | @
+ /_/  @@
+  /\/|@
+ |/\/ @
+   $  @
+   $  @
+      @@
+  _  _ @
+ (_)(_)@
+  /--\ @
+ /_/\_\@
+       @@
+  _  _ @
+ (_)(_)@
+ / __ \@
+ \____/@
+       @@
+  _   _ @
+ (_) (_)@
+ | |_| |@
+  \___/ @
+        @@
+  _  _ @
+ (_)(_)@
+ / _` |@
+ \__,_|@
+       @@
+  _   _ @
+ (_)_(_)@
+  / _ \ @
+  \___/ @
+        @@
+  _  _ @
+ (_)(_)@
+ | || |@
+  \_,_|@
+       @@
+   ___ @
+  / _ \@
+ | |< <@
+ | ||_/@
+ |_|   @@
+160  NO-BREAK SPACE
+ $@
+ $@
+ $@
+ $@
+ $@@
+161  INVERTED EXCLAMATION MARK
+  _ @
+ (_)@
+ | |@
+ |_|@
+    @@
+162  CENT SIGN
+     @
+  || @
+ / _)@
+ \ _)@
+  || @@
+163  POUND SIGN
+    __  @
+  _/ _\ @
+ |_ _|_ @
+ (_,___|@
+        @@
+164  CURRENCY SIGN
+ /\_/\@
+ \ . /@
+ / _ \@
+ \/ \/@
+      @@
+165  YEN SIGN
+  __ __ @
+  \ V / @
+ |__ __|@
+ |__ __|@
+   |_|  @@
+166  BROKEN BAR
+  _ @
+ | |@
+ |_|@
+ | |@
+ |_|@@
+167  SECTION SIGN
+    __ @
+   / _)@
+  /\ \ @
+  \ \/ @
+ (__/  @@
+168  DIAERESIS
+  _  _ @
+ (_)(_)@
+  $  $ @
+  $  $ @
+       @@
+169  COPYRIGHT SIGN
+   ____  @
+  / __ \ @
+ / / _| \@
+ \ \__| /@
+  \____/ @@
+170  FEMININE ORDINAL INDICATOR
+  __ _ @
+ / _` |@
+ \__,_|@
+ |____|@
+       @@
+171  LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
+   ____@
+  / / /@
+ < < < @
+  \_\_\@
+       @@
+172  NOT SIGN
+  ____ @
+ |__  |@
+    |_|@
+   $   @
+       @@
+173  SOFT HYPHEN
+     @
+  __ @
+ |__|@
+   $ @
+     @@
+174  REGISTERED SIGN
+   ____  @
+  / __ \ @
+ / | -) \@
+ \ ||\\ /@
+  \____/ @@
+175  MACRON
+  ___ @
+ |___|@
+   $  @
+   $  @
+      @@
+176  DEGREE SIGN
+  _ @
+ /.\@
+ \_/@
+  $ @
+    @@
+177  PLUS-MINUS SIGN
+    _   @
+  _| |_ @
+ |_   _|@
+  _|_|_ @
+ |_____|@@
+178  SUPERSCRIPT TWO
+  __ @
+ |_ )@
+ /__|@
+   $ @
+     @@
+179  SUPERSCRIPT THREE
+  ___@
+ |_ /@
+ |__)@
+   $ @
+     @@
+180  ACUTE ACCENT
+  __@
+ /_/@
+  $ @
+  $ @
+    @@
+181  MICRO SIGN
+       @
+  _  _ @
+ | || |@
+ | .,_|@
+ |_|   @@
+182  PILCROW SIGN
+  ____ @
+ /    |@
+ \_ | |@
+  |_|_|@
+       @@
+183  MIDDLE DOT
+    @
+  _ @
+ (_)@
+  $ @
+    @@
+184  CEDILLA
+    @
+    @
+    @
+  _ @
+ )_)@@
+185  SUPERSCRIPT ONE
+  _ @
+ / |@
+ |_|@
+  $ @
+    @@
+186  MASCULINE ORDINAL INDICATOR
+  ___ @
+ / _ \@
+ \___/@
+ |___|@
+      @@
+187  RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
+ ____  @
+ \ \ \ @
+  > > >@
+ /_/_/ @
+       @@
+188  VULGAR FRACTION ONE QUARTER
+  _  __   @
+ / |/ /__ @
+ |_/ /_' |@
+  /_/  |_|@
+          @@
+189  VULGAR FRACTION ONE HALF
+  _  __  @
+ / |/ /_ @
+ |_/ /_ )@
+  /_//__|@
+         @@
+190  VULGAR FRACTION THREE QUARTERS
+  ___ __   @
+ |_ // /__ @
+ |__) /_' |@
+   /_/  |_|@
+           @@
+191  INVERTED QUESTION MARK
+   _  @
+  (_) @
+ / /_ @
+ \___|@
+      @@
+192  LATIN CAPITAL LETTER A WITH GRAVE
+  __   @
+  \_\  @
+  /--\ @
+ /_/\_\@
+       @@
+193  LATIN CAPITAL LETTER A WITH ACUTE
+    __ @
+   /_/ @
+  /--\ @
+ /_/\_\@
+       @@
+194  LATIN CAPITAL LETTER A WITH CIRCUMFLEX
+   /\  @
+  |/\| @
+  /--\ @
+ /_/\_\@
+       @@
+195  LATIN CAPITAL LETTER A WITH TILDE
+   /\/|@
+  |/\/ @
+  /--\ @
+ /_/\_\@
+       @@
+196  LATIN CAPITAL LETTER A WITH DIAERESIS
+  _  _ @
+ (_)(_)@
+  /--\ @
+ /_/\_\@
+       @@
+197  LATIN CAPITAL LETTER A WITH RING ABOVE
+   __  @
+  (()) @
+  /--\ @
+ /_/\_\@
+       @@
+198  LATIN CAPITAL LETTER AE
+    ____ @
+   /, __|@
+  / _ _| @
+ /_/|___|@
+         @@
+199  LATIN CAPITAL LETTER C WITH CEDILLA
+   ___ @
+  / __|@
+ | (__ @
+  \___|@
+   )_) @@
+200  LATIN CAPITAL LETTER E WITH GRAVE
+  __ @
+  \_\@
+ | -<@
+ |__<@
+     @@
+201  LATIN CAPITAL LETTER E WITH ACUTE
+   __@
+  /_/@
+ | -<@
+ |__<@
+     @@
+202  LATIN CAPITAL LETTER E WITH CIRCUMFLEX
+  /\ @
+ |/\|@
+ | -<@
+ |__<@
+     @@
+203  LATIN CAPITAL LETTER E WITH DIAERESIS
+  _  _ @
+ (_)(_)@
+  | -< @
+  |__< @
+       @@
+204  LATIN CAPITAL LETTER I WITH GRAVE
+  __  @
+  \_\ @
+ |_ _|@
+ |___|@
+      @@
+205  LATIN CAPITAL LETTER I WITH ACUTE
+   __ @
+  /_/ @
+ |_ _|@
+ |___|@
+      @@
+206  LATIN CAPITAL LETTER I WITH CIRCUMFLEX
+  //\ @
+ |/_\|@
+ |_ _|@
+ |___|@
+      @@
+207  LATIN CAPITAL LETTER I WITH DIAERESIS
+  _   _ @
+ (_)_(_)@
+  |_ _| @
+  |___| @
+        @@
+208  LATIN CAPITAL LETTER ETH
+   ____  @
+  | __ \ @
+ |_ _|) |@
+  |____/ @
+         @@
+209  LATIN CAPITAL LETTER N WITH TILDE
+   /\/|@
+  |/\/ @
+ | \| |@
+ |_|\_|@
+       @@
+210  LATIN CAPITAL LETTER O WITH GRAVE
+  __   @
+  \_\_ @
+ / __ \@
+ \____/@
+       @@
+211  LATIN CAPITAL LETTER O WITH ACUTE
+    __ @
+  _/_/ @
+ / __ \@
+ \____/@
+       @@
+212  LATIN CAPITAL LETTER O WITH CIRCUMFLEX
+   /\  @
+  |/\| @
+ / __ \@
+ \____/@
+       @@
+213  LATIN CAPITAL LETTER O WITH TILDE
+   /\/|@
+  |/\/ @
+ / __ \@
+ \____/@
+       @@
+214  LATIN CAPITAL LETTER O WITH DIAERESIS
+  _  _ @
+ (_)(_)@
+ / __ \@
+ \____/@
+       @@
+215  MULTIPLICATION SIGN
+     @
+ /\/\@
+ >  <@
+ \/\/@
+     @@
+216  LATIN CAPITAL LETTER O WITH STROKE
+   ____  @
+  / _//\ @
+ | (//) |@
+  \//__/ @
+         @@
+217  LATIN CAPITAL LETTER U WITH GRAVE
+   __   @
+  _\_\_ @
+ | |_| |@
+  \___/ @
+        @@
+218  LATIN CAPITAL LETTER U WITH ACUTE
+    __  @
+  _/_/_ @
+ | |_| |@
+  \___/ @
+        @@
+219  LATIN CAPITAL LETTER U WITH CIRCUMFLEX
+   //\  @
+  |/ \| @
+ | |_| |@
+  \___/ @
+        @@
+220  LATIN CAPITAL LETTER U WITH DIAERESIS
+  _   _ @
+ (_) (_)@
+ | |_| |@
+  \___/ @
+        @@
+221  LATIN CAPITAL LETTER Y WITH ACUTE
+   __ @
+ _/_/_@
+ \ V /@
+  |_| @
+      @@
+222  LATIN CAPITAL LETTER THORN
+  _   @
+ | |_ @
+ | -_)@
+ |_|  @
+      @@
+223  LATIN SMALL LETTER SHARP S
+   ___ @
+  / _ \@
+ | |< <@
+ | ||_/@
+ |_|   @@
+224  LATIN SMALL LETTER A WITH GRAVE
+  __   @
+  \_\_ @
+ / _` |@
+ \__,_|@
+       @@
+225  LATIN SMALL LETTER A WITH ACUTE
+    __ @
+  _/_/ @
+ / _` |@
+ \__,_|@
+       @@
+226  LATIN SMALL LETTER A WITH CIRCUMFLEX
+   /\  @
+  |/\| @
+ / _` |@
+ \__,_|@
+       @@
+227  LATIN SMALL LETTER A WITH TILDE
+   /\/|@
+  |/\/ @
+ / _` |@
+ \__,_|@
+       @@
+228  LATIN SMALL LETTER A WITH DIAERESIS
+  _  _ @
+ (_)(_)@
+ / _` |@
+ \__,_|@
+       @@
+229  LATIN SMALL LETTER A WITH RING ABOVE
+   __  @
+  (()) @
+ / _` |@
+ \__,_|@
+       @@
+230  LATIN SMALL LETTER AE
+         @
+  __ ___ @
+ / _` -_)@
+ \__,___|@
+         @@
+231  LATIN SMALL LETTER C WITH CEDILLA
+     @
+  __ @
+ / _|@
+ \__|@
+  )_)@@
+232  LATIN SMALL LETTER E WITH GRAVE
+  __  @
+  \_\ @
+ / -_)@
+ \___|@
+      @@
+233  LATIN SMALL LETTER E WITH ACUTE
+   __ @
+  /_/ @
+ / -_)@
+ \___|@
+      @@
+234  LATIN SMALL LETTER E WITH CIRCUMFLEX
+  //\ @
+ |/_\|@
+ / -_)@
+ \___|@
+      @@
+235  LATIN SMALL LETTER E WITH DIAERESIS
+  _   _ @
+ (_)_(_)@
+  / -_) @
+  \___| @
+        @@
+236  LATIN SMALL LETTER I WITH GRAVE
+ __ @
+ \_\@
+ | |@
+ |_|@
+    @@
+237  LATIN SMALL LETTER I WITH ACUTE
+  __@
+ /_/@
+ | |@
+ |_|@
+    @@
+238  LATIN SMALL LETTER I WITH CIRCUMFLEX
+  //\ @
+ |/_\|@
+  | | @
+  |_| @
+      @@
+239  LATIN SMALL LETTER I WITH DIAERESIS
+  _   _ @
+ (_)_(_)@
+   | |  @
+   |_|  @
+        @@
+240  LATIN SMALL LETTER ETH
+  \\/\ @
+  \/\\ @
+ / _` |@
+ \___/ @
+       @@
+241  LATIN SMALL LETTER N WITH TILDE
+  /\/| @
+ |/\/  @
+ | ' \ @
+ |_||_|@
+       @@
+242  LATIN SMALL LETTER O WITH GRAVE
+  __  @
+  \_\ @
+ / _ \@
+ \___/@
+      @@
+243  LATIN SMALL LETTER O WITH ACUTE
+   __ @
+  /_/ @
+ / _ \@
+ \___/@
+      @@
+244  LATIN SMALL LETTER O WITH CIRCUMFLEX
+  //\ @
+ |/_\|@
+ / _ \@
+ \___/@
+      @@
+245  LATIN SMALL LETTER O WITH TILDE
+  /\/|@
+ |/\/ @
+ / _ \@
+ \___/@
+      @@
+246  LATIN SMALL LETTER O WITH DIAERESIS
+  _   _ @
+ (_)_(_)@
+  / _ \ @
+  \___/ @
+        @@
+247  DIVISION SIGN
+   _  @
+  (_) @
+ |___|@
+  (_) @
+      @@
+248  LATIN SMALL LETTER O WITH STROKE
+      @
+  ___ @
+ / //\@
+ \//_/@
+      @@
+249  LATIN SMALL LETTER U WITH GRAVE
+  __   @
+  \_\_ @
+ | || |@
+  \_,_|@
+       @@
+250  LATIN SMALL LETTER U WITH ACUTE
+    __ @
+  _/_/ @
+ | || |@
+  \_,_|@
+       @@
+251  LATIN SMALL LETTER U WITH CIRCUMFLEX
+   /\  @
+  |/\| @
+ | || |@
+  \_,_|@
+       @@
+252  LATIN SMALL LETTER U WITH DIAERESIS
+  _  _ @
+ (_)(_)@
+ | || |@
+  \_,_|@
+       @@
+253  LATIN SMALL LETTER Y WITH ACUTE
+    __ @
+  _/_/ @
+ | || |@
+  \_, |@
+  |__/ @@
+254  LATIN SMALL LETTER THORN
+  _    @
+ | |__ @
+ | '_ \@
+ | .__/@
+ |_|   @@
+255  LATIN SMALL LETTER Y WITH DIAERESIS
+  _  _ @
+ (_)(_)@
+ | || |@
+  \_, |@
+  |__/ @@
diff --git a/pagetop/src/app/speed.flf b/pagetop/src/app/speed.flf
new file mode 100644
index 00000000..d294c52f
--- /dev/null
+++ b/pagetop/src/app/speed.flf
@@ -0,0 +1,1301 @@
+flf2a$ 6 5 16 15 16
+Speed by Claude Martins 2/95 -- based on Slant
+Includes ISO Latin-1
+figlet release 2.1 -- 12 Aug 1994
+Permission is hereby given to modify this font, as long as the
+modifier's name is placed on a comment line.
+
+Explanation of first line:
+flf2 - "magic number" for file identification
+a    - should always be `a', for now
+$    - the "hardblank" -- prints as a blank, but can't be smushed
+6    - height of a character
+5    - height of a character, not including descenders
+14   - max line length (excluding comment lines) + a fudge factor
+15   - default smushmode for this font
+16   - number of comment lines
+
+     $$@
+    $$ @
+   $$  @
+  $$   @
+ $$    @
+$$     @@
+______@
+___  /@
+__  / @
+ /_/  @
+(_)   @
+      @@
+___ _ @
+_( | )@
+_|/|/ @
+  $   @
+ $    @
+      @@
+_______ __ @
+____/ // /_@
+_ _  _  __/@
+/_  _  __/ @
+ /_//_/    @
+           @@
+_______@
+____/ /@
+__  __/@
+_(_  ) @
+/  _/  @
+/_/    @@
+____   __@
+__(_)_/_/@
+____/_/  @
+__/_/_   @
+/_/ (_)  @
+         @@
+______   @
+__( _ )  @
+_  __ \/|@
+/ /_/  < @
+\____/\/ @
+         @@
+___ @
+_( )@
+_|/ @
+ $  @
+$   @
+    @@
+_______@
+____/_/@
+__  /  @
+_  /   @
+/ /    @
+|_|    @@
+______ @
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+____  /@
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+__/_/  @
+/_/    @@
+_____  @
+____/|_@
+_|    /@
+/_ __| @
+ |/    @
+       @@
+       @
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+___/ /_@
+/_  __/@
+ /_/   @
+       @@
+    @
+    @
+    @
+___ @
+_( )@
+_|/ @@
+        @
+        @
+________@
+_/_____/@
+   $    @
+        @@
+    @
+    @
+    @
+___ @
+_(_)@
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+_________@
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+/ /_/ / @
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+        @@
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+____@
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+/ / @
+\ \ @
+ \_\@
+    @@
+       @
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+___  / / /@
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+_  //__/  @
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diff --git a/pagetop/src/app/starwars.flf b/pagetop/src/app/starwars.flf
new file mode 100644
index 00000000..6ea55f02
--- /dev/null
+++ b/pagetop/src/app/starwars.flf
@@ -0,0 +1,719 @@
+flf2a$ 7 6 22 15 4
+starwars.flf by Ryan Youck (youck@cs.uregina.ca) Dec 25/1994
+I am not responsible for use of this font  
+Based on Big.flf by Glenn Chappell
+
+$ $@
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+|  |_)  |$@
+|______/ $@
+         $@@
+  ______$@
+ /      |@
+|  ,----'@
+|  |    $@
+|  `----.@
+ \______|@
+        $@@
+ _______ $@
+|       \$@
+|  .--.  |@
+|  |  |  |@
+|  '--'  |@
+|_______/$@
+         $@@
+ _______ @
+|   ____|@
+|  |__  $@
+|   __| $@
+|  |____ @
+|_______|@
+         @@
+ _______ @
+|   ____|@
+|  |__  $@
+|   __| $@
+|  |   $ @
+|__|     @
+         @@
+  _______ @
+ /  _____|@
+|  |  __ $@
+|  | |_ |$@
+|  |__| |$@
+ \______|$@
+         $@@
+ __    __ $@
+|  |  |  |$@
+|  |__|  |$@
+|   __   |$@
+|  |  |  |$@
+|__|  |__|$@
+          $@@
+ __ $@
+|  |$@
+|  |$@
+|  |$@
+|  |$@
+|__|$@
+    $@@
+       __ $@
+      |  |$@
+      |  |$@
+.--.  |  |$@
+|  `--'  |$@
+ \______/ $@
+          $@@
+ __  ___$@
+|  |/  /$@
+|  '  / $@
+|    <  $@
+|  .  \ $@
+|__|\__\$@
+        $@@
+ __     $@
+|  |    $@
+|  |    $@
+|  |    $@
+|  `----.@
+|_______|@
+        $@@
+.___  ___.$@
+|   \/   |$@
+|  \  /  |$@
+|  |\/|  |$@
+|  |  |  |$@
+|__|  |__|$@
+          $@@
+.__   __.$@
+|  \ |  |$@
+|   \|  |$@
+|  . `  |$@
+|  |\   |$@
+|__| \__|$@
+         $@@
+  ______  $@
+ /  __  \ $@
+|  |  |  |$@
+|  |  |  |$@
+|  `--'  |$@
+ \______/ $@
+          $@@
+.______  $@
+|   _  \ $@
+|  |_)  |$@
+|   ___/ $@
+|  |  $   @
+| _|  $   @
+      $   @@
+  ______    $ @
+ /  __  \   $ @
+|  |  |  |  $ @
+|  |  |  |  $ @
+|  `--'  '--. @
+ \_____\_____\@
+            $ @@
+.______    $ @
+|   _  \   $ @
+|  |_)  |  $ @
+|      /   $ @
+|  |\  \----.@
+| _| `._____|@
+            $@@
+     _______.@
+    /       |@
+   |   (----`@
+    \   \   $@
+.----)   |  $@
+|_______/   $@
+            $@@
+.___________.@
+|           |@
+`---|  |----`@
+    |  |   $ @
+    |  |   $ @
+    |__|   $ @
+           $ @@
+ __    __ $@
+|  |  |  |$@
+|  |  |  |$@
+|  |  |  |$@
+|  `--'  |$@
+ \______/ $@
+          $@@
+____    ____$@
+\   \  /   /$@
+ \   \/   /$ @
+  \      /$  @
+   \    /$   @
+    \__/$    @
+        $    @@
+____    __    ____$@
+\   \  /  \  /   /$@
+ \   \/    \/   /$ @
+  \            /$  @
+   \    /\    /$   @
+    \__/  \__/$    @
+              $    @@
+___   ___$@
+\  \ /  /$@
+ \  V  / $@
+  >   <  $@
+ /  .  \ $@
+/__/ \__\$@
+         $@@
+____    ____$@
+\   \  /   /$@
+ \   \/   /$ @
+  \_    _/$  @
+    |  |$    @
+    |__|$    @
+        $    @@
+ ________ $@
+|       / $@
+`---/  /  $@
+   /  /   $@
+  /  /----.@
+ /________|@
+          $@@
+   ___@
+  /  /@
+ |  |$@
+/  /$ @
+\  \$ @
+ |  |$@
+  \__\@@
+ __ $@
+|  |$@
+|  |$@
+|  |$@
+|  |$@
+|  |$@
+|__|$@@
+___   @
+\  \$ @
+ |  | @
+  \  \@
+  /  /@
+ |  | @
+/__/$ @@
+  __  _ @
+ /  \/ |@
+|_/\__/ @
+     $  @
+     $  @
+     $  @
+        @@
+  _   _  @
+ (_)_(_) @
+   / \   @
+  / _ \  @
+ / ___ \ @
+/_/   \_\@
+         @@
+ _   _ @
+(_)_(_)@
+ / _ \ @
+| | | |@
+| |_| |@
+ \___/ @
+       @@
+ _   _ @
+(_) (_)@
+| | | |@
+| | | |@
+| |_| |@
+ \___/ @
+       @@
+ _   _ @
+(_) (_)@
+  __ _ @
+ / _` |@
+| (_| |@
+ \__,_|@
+       @@
+ _   _ @
+(_) (_)@
+  ___  @
+ / _ \ @
+| (_) |@
+ \___/ @
+       @@
+ _   _ @
+(_) (_)@
+ _   _ @
+| | | |@
+| |_| |@
+ \__,_|@
+       @@
+  ___  @
+ / _ \ @
+| | ) |@
+| |< < @
+| | ) |@
+| ||_/ @
+|_|    @@
diff --git a/pagetop/src/base.rs b/pagetop/src/base.rs
new file mode 100644
index 00000000..196f119c
--- /dev/null
+++ b/pagetop/src/base.rs
@@ -0,0 +1,9 @@
+//! Base actions, components, packages, and themes.
+
+pub mod action;
+
+pub mod component;
+
+pub mod package;
+
+pub mod theme;
diff --git a/pagetop/src/base/action.rs b/pagetop/src/base/action.rs
new file mode 100644
index 00000000..fe6741c5
--- /dev/null
+++ b/pagetop/src/base/action.rs
@@ -0,0 +1,9 @@
+use crate::prelude::*;
+
+pub type FnActionWithComponent<C> = fn(component: &mut C, cx: &mut Context);
+
+pub mod page;
+
+pub mod theme;
+
+pub mod component;
diff --git a/pagetop/src/base/action/component.rs b/pagetop/src/base/action/component.rs
new file mode 100644
index 00000000..03eedf26
--- /dev/null
+++ b/pagetop/src/base/action/component.rs
@@ -0,0 +1,8 @@
+mod is_renderable;
+pub use is_renderable::*;
+
+mod before_prepare_component;
+pub use before_prepare_component::*;
+
+mod after_prepare_component;
+pub use after_prepare_component::*;
diff --git a/pagetop/src/base/action/component/after_prepare_component.rs b/pagetop/src/base/action/component/after_prepare_component.rs
new file mode 100644
index 00000000..233c1a7b
--- /dev/null
+++ b/pagetop/src/base/action/component/after_prepare_component.rs
@@ -0,0 +1,65 @@
+use crate::prelude::*;
+
+use crate::base::action::FnActionWithComponent;
+
+pub struct AfterPrepare<C: ComponentTrait> {
+    f: FnActionWithComponent<C>,
+    referer_type_id: Option<TypeId>,
+    referer_id: OptionId,
+    weight: Weight,
+}
+
+impl<C: ComponentTrait> ActionTrait for AfterPrepare<C> {
+    fn referer_type_id(&self) -> Option<TypeId> {
+        self.referer_type_id
+    }
+
+    fn referer_id(&self) -> Option<String> {
+        self.referer_id.get()
+    }
+
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl<C: ComponentTrait> AfterPrepare<C> {
+    pub fn new(f: FnActionWithComponent<C>) -> Self {
+        AfterPrepare {
+            f,
+            referer_type_id: Some(TypeId::of::<C>()),
+            referer_id: OptionId::default(),
+            weight: 0,
+        }
+    }
+
+    pub fn filter_by_referer_id(mut self, id: impl Into<String>) -> Self {
+        self.referer_id.set_value(id);
+        self
+    }
+
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
+        self
+    }
+
+    #[inline(always)]
+    #[allow(clippy::inline_always)]
+    pub(crate) fn dispatch(component: &mut C, cx: &mut Context) {
+        dispatch_actions(
+            &ActionKey::new(TypeId::of::<Self>(), None, Some(TypeId::of::<C>()), None),
+            |action: &Self| (action.f)(component, cx),
+        );
+        if let Some(id) = component.id() {
+            dispatch_actions(
+                &ActionKey::new(
+                    TypeId::of::<Self>(),
+                    None,
+                    Some(TypeId::of::<C>()),
+                    Some(id),
+                ),
+                |action: &Self| (action.f)(component, cx),
+            );
+        }
+    }
+}
diff --git a/pagetop/src/base/action/component/before_prepare_component.rs b/pagetop/src/base/action/component/before_prepare_component.rs
new file mode 100644
index 00000000..cedc45db
--- /dev/null
+++ b/pagetop/src/base/action/component/before_prepare_component.rs
@@ -0,0 +1,65 @@
+use crate::prelude::*;
+
+use crate::base::action::FnActionWithComponent;
+
+pub struct BeforePrepare<C: ComponentTrait> {
+    f: FnActionWithComponent<C>,
+    referer_type_id: Option<TypeId>,
+    referer_id: OptionId,
+    weight: Weight,
+}
+
+impl<C: ComponentTrait> ActionTrait for BeforePrepare<C> {
+    fn referer_type_id(&self) -> Option<TypeId> {
+        self.referer_type_id
+    }
+
+    fn referer_id(&self) -> Option<String> {
+        self.referer_id.get()
+    }
+
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl<C: ComponentTrait> BeforePrepare<C> {
+    pub fn new(f: FnActionWithComponent<C>) -> Self {
+        BeforePrepare {
+            f,
+            referer_type_id: Some(TypeId::of::<C>()),
+            referer_id: OptionId::default(),
+            weight: 0,
+        }
+    }
+
+    pub fn filter_by_referer_id(mut self, id: impl Into<String>) -> Self {
+        self.referer_id.set_value(id);
+        self
+    }
+
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
+        self
+    }
+
+    #[inline(always)]
+    #[allow(clippy::inline_always)]
+    pub(crate) fn dispatch(component: &mut C, cx: &mut Context) {
+        dispatch_actions(
+            &ActionKey::new(TypeId::of::<Self>(), None, Some(TypeId::of::<C>()), None),
+            |action: &Self| (action.f)(component, cx),
+        );
+        if let Some(id) = component.id() {
+            dispatch_actions(
+                &ActionKey::new(
+                    TypeId::of::<Self>(),
+                    None,
+                    Some(TypeId::of::<C>()),
+                    Some(id),
+                ),
+                |action: &Self| (action.f)(component, cx),
+            );
+        }
+    }
+}
diff --git a/pagetop/src/base/action/component/is_renderable.rs b/pagetop/src/base/action/component/is_renderable.rs
new file mode 100644
index 00000000..93159237
--- /dev/null
+++ b/pagetop/src/base/action/component/is_renderable.rs
@@ -0,0 +1,77 @@
+use crate::prelude::*;
+
+pub type FnIsRenderable<C> = fn(component: &C, cx: &mut Context) -> bool;
+
+pub struct IsRenderable<C: ComponentTrait> {
+    f: FnIsRenderable<C>,
+    referer_type_id: Option<TypeId>,
+    referer_id: OptionId,
+    weight: Weight,
+}
+
+impl<C: ComponentTrait> ActionTrait for IsRenderable<C> {
+    fn referer_type_id(&self) -> Option<TypeId> {
+        self.referer_type_id
+    }
+
+    fn referer_id(&self) -> Option<String> {
+        self.referer_id.get()
+    }
+
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl<C: ComponentTrait> IsRenderable<C> {
+    pub fn new(f: FnIsRenderable<C>) -> Self {
+        IsRenderable {
+            f,
+            referer_type_id: Some(TypeId::of::<C>()),
+            referer_id: OptionId::default(),
+            weight: 0,
+        }
+    }
+
+    pub fn filter_by_referer_id(mut self, id: impl Into<String>) -> Self {
+        self.referer_id.set_value(id);
+        self
+    }
+
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
+        self
+    }
+
+    #[inline(always)]
+    #[allow(clippy::inline_always)]
+    pub(crate) fn dispatch(component: &C, cx: &mut Context) -> bool {
+        let mut renderable = true;
+        dispatch_actions(
+            &ActionKey::new(TypeId::of::<Self>(), None, Some(TypeId::of::<C>()), None),
+            |action: &Self| {
+                if renderable && !(action.f)(component, cx) {
+                    renderable = false;
+                }
+            },
+        );
+        if renderable {
+            if let Some(id) = component.id() {
+                dispatch_actions(
+                    &ActionKey::new(
+                        TypeId::of::<Self>(),
+                        None,
+                        Some(TypeId::of::<C>()),
+                        Some(id),
+                    ),
+                    |action: &Self| {
+                        if renderable && !(action.f)(component, cx) {
+                            renderable = false;
+                        }
+                    },
+                );
+            }
+        }
+        renderable
+    }
+}
diff --git a/pagetop/src/base/action/page.rs b/pagetop/src/base/action/page.rs
new file mode 100644
index 00000000..9c89e2d1
--- /dev/null
+++ b/pagetop/src/base/action/page.rs
@@ -0,0 +1,5 @@
+mod before_render_body;
+pub use before_render_body::*;
+
+mod after_render_body;
+pub use after_render_body::*;
diff --git a/pagetop/src/base/action/page/after_render_body.rs b/pagetop/src/base/action/page/after_render_body.rs
new file mode 100644
index 00000000..81a89d87
--- /dev/null
+++ b/pagetop/src/base/action/page/after_render_body.rs
@@ -0,0 +1,34 @@
+use crate::prelude::*;
+
+pub type FnAfterRenderBody = fn(page: &mut Page);
+
+pub struct AfterRenderBody {
+    f: FnAfterRenderBody,
+    weight: Weight,
+}
+
+impl ActionTrait for AfterRenderBody {
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl AfterRenderBody {
+    pub fn new(f: FnAfterRenderBody) -> Self {
+        AfterRenderBody { f, weight: 0 }
+    }
+
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
+        self
+    }
+
+    #[inline(always)]
+    #[allow(clippy::inline_always)]
+    pub(crate) fn dispatch(page: &mut Page) {
+        dispatch_actions(
+            &ActionKey::new(TypeId::of::<Self>(), None, None, None),
+            |action: &Self| (action.f)(page),
+        );
+    }
+}
diff --git a/pagetop/src/base/action/page/before_render_body.rs b/pagetop/src/base/action/page/before_render_body.rs
new file mode 100644
index 00000000..e0a9d770
--- /dev/null
+++ b/pagetop/src/base/action/page/before_render_body.rs
@@ -0,0 +1,34 @@
+use crate::prelude::*;
+
+pub type FnBeforeRenderBody = fn(page: &mut Page);
+
+pub struct BeforeRenderBody {
+    f: FnBeforeRenderBody,
+    weight: Weight,
+}
+
+impl ActionTrait for BeforeRenderBody {
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+}
+
+impl BeforeRenderBody {
+    pub fn new(f: FnBeforeRenderBody) -> Self {
+        BeforeRenderBody { f, weight: 0 }
+    }
+
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
+        self
+    }
+
+    #[inline(always)]
+    #[allow(clippy::inline_always)]
+    pub(crate) fn dispatch(page: &mut Page) {
+        dispatch_actions(
+            &ActionKey::new(TypeId::of::<Self>(), None, None, None),
+            |action: &Self| (action.f)(page),
+        );
+    }
+}
diff --git a/pagetop/src/base/action/theme.rs b/pagetop/src/base/action/theme.rs
new file mode 100644
index 00000000..8f307d98
--- /dev/null
+++ b/pagetop/src/base/action/theme.rs
@@ -0,0 +1,8 @@
+mod before_prepare_component;
+pub use before_prepare_component::*;
+
+mod after_prepare_component;
+pub use after_prepare_component::*;
+
+mod render_component;
+pub use render_component::*;
diff --git a/pagetop/src/base/action/theme/after_prepare_component.rs b/pagetop/src/base/action/theme/after_prepare_component.rs
new file mode 100644
index 00000000..7285aec1
--- /dev/null
+++ b/pagetop/src/base/action/theme/after_prepare_component.rs
@@ -0,0 +1,43 @@
+use crate::prelude::*;
+
+use crate::base::action::FnActionWithComponent;
+
+pub struct AfterPrepare<C: ComponentTrait> {
+    f: FnActionWithComponent<C>,
+    theme_type_id: Option<TypeId>,
+    referer_type_id: Option<TypeId>,
+}
+
+impl<C: ComponentTrait> ActionTrait for AfterPrepare<C> {
+    fn theme_type_id(&self) -> Option<TypeId> {
+        self.theme_type_id
+    }
+
+    fn referer_type_id(&self) -> Option<TypeId> {
+        self.referer_type_id
+    }
+}
+
+impl<C: ComponentTrait> AfterPrepare<C> {
+    pub fn new(theme: ThemeRef, f: FnActionWithComponent<C>) -> Self {
+        AfterPrepare {
+            f,
+            theme_type_id: Some(theme.type_id()),
+            referer_type_id: Some(TypeId::of::<C>()),
+        }
+    }
+
+    #[inline(always)]
+    #[allow(clippy::inline_always)]
+    pub(crate) fn dispatch(component: &mut C, cx: &mut Context) {
+        dispatch_actions(
+            &ActionKey::new(
+                TypeId::of::<Self>(),
+                Some(cx.theme().type_id()),
+                Some(TypeId::of::<C>()),
+                None,
+            ),
+            |action: &Self| (action.f)(component, cx),
+        );
+    }
+}
diff --git a/pagetop/src/base/action/theme/before_prepare_component.rs b/pagetop/src/base/action/theme/before_prepare_component.rs
new file mode 100644
index 00000000..7c80a655
--- /dev/null
+++ b/pagetop/src/base/action/theme/before_prepare_component.rs
@@ -0,0 +1,43 @@
+use crate::prelude::*;
+
+use crate::base::action::FnActionWithComponent;
+
+pub struct BeforePrepare<C: ComponentTrait> {
+    f: FnActionWithComponent<C>,
+    theme_type_id: Option<TypeId>,
+    referer_type_id: Option<TypeId>,
+}
+
+impl<C: ComponentTrait> ActionTrait for BeforePrepare<C> {
+    fn theme_type_id(&self) -> Option<TypeId> {
+        self.theme_type_id
+    }
+
+    fn referer_type_id(&self) -> Option<TypeId> {
+        self.referer_type_id
+    }
+}
+
+impl<C: ComponentTrait> BeforePrepare<C> {
+    pub fn new(theme: ThemeRef, f: FnActionWithComponent<C>) -> Self {
+        BeforePrepare {
+            f,
+            theme_type_id: Some(theme.type_id()),
+            referer_type_id: Some(TypeId::of::<C>()),
+        }
+    }
+
+    #[inline(always)]
+    #[allow(clippy::inline_always)]
+    pub(crate) fn dispatch(component: &mut C, cx: &mut Context) {
+        dispatch_actions(
+            &ActionKey::new(
+                TypeId::of::<Self>(),
+                Some(cx.theme().type_id()),
+                Some(TypeId::of::<C>()),
+                None,
+            ),
+            |action: &Self| (action.f)(component, cx),
+        );
+    }
+}
diff --git a/pagetop/src/base/action/theme/render_component.rs b/pagetop/src/base/action/theme/render_component.rs
new file mode 100644
index 00000000..e79c5c92
--- /dev/null
+++ b/pagetop/src/base/action/theme/render_component.rs
@@ -0,0 +1,49 @@
+use crate::prelude::*;
+
+pub type FnRenderComponent<C> = fn(component: &C, cx: &mut Context) -> Option<Markup>;
+
+pub struct RenderComponent<C: ComponentTrait> {
+    f: FnRenderComponent<C>,
+    theme_type_id: Option<TypeId>,
+    referer_type_id: Option<TypeId>,
+}
+
+impl<C: ComponentTrait> ActionTrait for RenderComponent<C> {
+    fn theme_type_id(&self) -> Option<TypeId> {
+        self.theme_type_id
+    }
+
+    fn referer_type_id(&self) -> Option<TypeId> {
+        self.referer_type_id
+    }
+}
+
+impl<C: ComponentTrait> RenderComponent<C> {
+    pub fn new(theme: ThemeRef, f: FnRenderComponent<C>) -> Self {
+        RenderComponent {
+            f,
+            theme_type_id: Some(theme.type_id()),
+            referer_type_id: Some(TypeId::of::<C>()),
+        }
+    }
+
+    #[inline(always)]
+    #[allow(clippy::inline_always)]
+    pub(crate) fn dispatch(component: &C, cx: &mut Context) -> Option<Markup> {
+        let mut render_component: Option<Markup> = None;
+        dispatch_actions(
+            &ActionKey::new(
+                TypeId::of::<Self>(),
+                Some(cx.theme().type_id()),
+                Some(TypeId::of::<C>()),
+                None,
+            ),
+            |action: &Self| {
+                if render_component.is_none() {
+                    render_component = (action.f)(component, cx);
+                }
+            },
+        );
+        render_component
+    }
+}
diff --git a/pagetop/src/base/component.rs b/pagetop/src/base/component.rs
new file mode 100644
index 00000000..93b22fa1
--- /dev/null
+++ b/pagetop/src/base/component.rs
@@ -0,0 +1,11 @@
+mod html;
+pub use html::Html;
+
+mod fluent;
+pub use fluent::Fluent;
+
+mod error403;
+pub use error403::Error403;
+
+mod error404;
+pub use error404::Error404;
diff --git a/pagetop/src/base/component/error403.rs b/pagetop/src/base/component/error403.rs
new file mode 100644
index 00000000..172487d7
--- /dev/null
+++ b/pagetop/src/base/component/error403.rs
@@ -0,0 +1,17 @@
+use crate::prelude::*;
+
+pub struct Error403;
+
+impl ComponentTrait for Error403 {
+    fn new() -> Self {
+        Error403
+    }
+
+    fn prepare_component(&self, _cx: &mut Context) -> PrepareMarkup {
+        PrepareMarkup::With(html! {
+            div {
+                h1 { ("FORBIDDEN ACCESS") }
+            }
+        })
+    }
+}
diff --git a/pagetop/src/base/component/error404.rs b/pagetop/src/base/component/error404.rs
new file mode 100644
index 00000000..0292df8f
--- /dev/null
+++ b/pagetop/src/base/component/error404.rs
@@ -0,0 +1,17 @@
+use crate::prelude::*;
+
+pub struct Error404;
+
+impl ComponentTrait for Error404 {
+    fn new() -> Self {
+        Error404
+    }
+
+    fn prepare_component(&self, _cx: &mut Context) -> PrepareMarkup {
+        PrepareMarkup::With(html! {
+            div {
+                h1 { ("RESOURCE NOT FOUND") }
+            }
+        })
+    }
+}
diff --git a/pagetop/src/base/component/fluent.rs b/pagetop/src/base/component/fluent.rs
new file mode 100644
index 00000000..9e7220fa
--- /dev/null
+++ b/pagetop/src/base/component/fluent.rs
@@ -0,0 +1,25 @@
+use crate::prelude::*;
+
+#[derive(AutoDefault)]
+pub struct Fluent(L10n);
+
+impl ComponentTrait for Fluent {
+    fn new() -> Self {
+        Fluent::default()
+    }
+
+    fn prepare_component(&self, cx: &mut Context) -> PrepareMarkup {
+        PrepareMarkup::With(self.0.escaped(cx.langid()))
+    }
+}
+
+impl Fluent {
+    pub fn with(l10n: L10n) -> Self {
+        Fluent(l10n)
+    }
+
+    pub fn set_l10n(&mut self, l10n: L10n) -> &mut Self {
+        self.0 = l10n;
+        self
+    }
+}
diff --git a/pagetop/src/base/component/html.rs b/pagetop/src/base/component/html.rs
new file mode 100644
index 00000000..6d308438
--- /dev/null
+++ b/pagetop/src/base/component/html.rs
@@ -0,0 +1,25 @@
+use crate::prelude::*;
+
+#[derive(AutoDefault)]
+pub struct Html(Markup);
+
+impl ComponentTrait for Html {
+    fn new() -> Self {
+        Html::default()
+    }
+
+    fn prepare_component(&self, _cx: &mut Context) -> PrepareMarkup {
+        PrepareMarkup::With(html! { (self.0) })
+    }
+}
+
+impl Html {
+    pub fn with(html: Markup) -> Self {
+        Html(html)
+    }
+
+    pub fn set_html(&mut self, html: Markup) -> &mut Self {
+        self.0 = html;
+        self
+    }
+}
diff --git a/pagetop/src/base/package.rs b/pagetop/src/base/package.rs
new file mode 100644
index 00000000..7b633f33
--- /dev/null
+++ b/pagetop/src/base/package.rs
@@ -0,0 +1,133 @@
+use crate::prelude::*;
+
+pub struct Welcome;
+
+impl PackageTrait for Welcome {
+    fn name(&self) -> L10n {
+        L10n::l("welcome_package_name")
+    }
+
+    fn description(&self) -> L10n {
+        L10n::l("welcome_package_description")
+    }
+
+    fn configure_service(&self, scfg: &mut service::web::ServiceConfig) {
+        scfg.route("/", service::web::get().to(homepage));
+    }
+}
+
+async fn homepage(request: HttpRequest) -> ResultPage<Markup, ErrorPage> {
+    Page::new(request)
+        .with_title(L10n::l("welcome_page"))
+        .with_assets(AssetsOp::Theme("Basic"))
+        .with_assets(AssetsOp::AddStyleSheet(StyleSheet::inline("styles", r##"
+            body {
+                background-color: #f3d060;
+                font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+                font-size: 20px;
+            }
+            .skip__to_content {
+                display: none;
+            }
+            .wrapper {
+                max-width: 1200px;
+                width: 100%;
+                margin: 0 auto;
+                padding: 0;
+            }
+            .container {
+                padding: 0 16px;
+            }
+            .title {
+                font-size: clamp(3rem, 10vw, 10rem);
+                letter-spacing: -0.05em;
+                line-height: 1.2;
+                margin: 0;
+            }
+            .subtitle {
+                font-size: clamp(1.8rem, 2vw, 3rem);
+                letter-spacing: -0.02em;
+                line-height: 1.2;
+                margin: 0;
+            }
+            .powered {
+                margin: .5em 0 1em;
+            }
+            .box-container {
+                display: flex;
+                flex-wrap: wrap;
+                justify-content: space-between;
+                align-items: stretch;
+                gap: 1.5em;
+            }
+            .box {
+                flex: 1 1 280px;
+                border: 3px solid #25282a;
+                box-shadow: 5px 5px 0px #25282a;
+                box-sizing: border-box;
+                padding: 0 16px;
+            }
+            footer {
+                margin-top: 5em;
+                font-size: 14px;
+                font-weight: 500;
+                color: #a5282c;
+            }
+        "##)))
+        .with_component(Html::with(html! {
+            div class="wrapper" {
+                div class="container" {
+                    h1 class="title" { (L10n::l("welcome_title").markup()) }
+
+                    p class="subtitle" {
+                        (L10n::l("welcome_intro").with_arg("app", format!(
+                            "<span style=\"font-weight: bold;\">{}</span>",
+                            &global::SETTINGS.app.name
+                        )).markup())
+                    }
+                    p class="powered" {
+                        (L10n::l("welcome_powered").with_arg("pagetop", format!(
+                            "<a href=\"{}\" target=\"_blank\">{}</a>",
+                            "https://crates.io/crates/pagetop", "PageTop"
+                        )).markup())
+                    }
+
+                    h2 { (L10n::l("welcome_page").markup()) }
+
+                    div class="box-container" {
+                        section class="box" style="background-color: #5eb0e5;" {
+                            h3 {
+                                (L10n::l("welcome_subtitle")
+                                    .with_arg("app", &global::SETTINGS.app.name)
+                                    .markup())
+                            }
+                            p { (L10n::l("welcome_text1").markup()) }
+                            p { (L10n::l("welcome_text2").markup()) }
+                        }
+                        section class="box" style="background-color: #aee1cd;" {
+                            h3 {
+                                (L10n::l("welcome_pagetop_title").markup())
+                            }
+                            p { (L10n::l("welcome_pagetop_text1").markup()) }
+                            p { (L10n::l("welcome_pagetop_text2").markup()) }
+                            p { (L10n::l("welcome_pagetop_text3").markup()) }
+                        }
+                        section class="box" style="background-color: #ebebe3;" {
+                            h3 {
+                                (L10n::l("welcome_issues_title").markup())
+                            }
+                            p { (L10n::l("welcome_issues_text1").markup()) }
+                            p {
+                                (L10n::l("welcome_issues_text2")
+                                    .with_arg("app", &global::SETTINGS.app.name)
+                                    .markup())
+                            }
+                        }
+                    }
+
+                    footer { "[ " (L10n::l("welcome_have_fun").markup()) " ]" }
+                }
+            }
+        }))
+        .render()
+}
diff --git a/pagetop/src/base/theme.rs b/pagetop/src/base/theme.rs
new file mode 100644
index 00000000..c07ffc56
--- /dev/null
+++ b/pagetop/src/base/theme.rs
@@ -0,0 +1,11 @@
+use crate::prelude::*;
+
+pub struct Basic;
+
+impl PackageTrait for Basic {
+    fn theme(&self) -> Option<ThemeRef> {
+        Some(&Basic)
+    }
+}
+
+impl ThemeTrait for Basic {}
diff --git a/pagetop/src/config.rs b/pagetop/src/config.rs
new file mode 100644
index 00000000..07924057
--- /dev/null
+++ b/pagetop/src/config.rs
@@ -0,0 +1,196 @@
+//! Load configuration settings.
+//!
+//! These settings are loaded from [TOML](https://toml.io) files as `key = value` pairs and mapped
+//! into type-safe structures with predefined values.
+//!
+//! Following the [Twelve-Factor App](https://12factor.net/config) methodology, `PageTop` separates
+//! code from configuration. This approach allows configurations to vary across deployments, such as
+//! development, staging, or production, without changing the codebase.
+//!
+//!
+//! # Loading configuration settings
+//!
+//! If your application requires configuration files, create a `config` directory in the root of
+//! your project, at the same level as the *Cargo.toml* file or the application's binary.
+//!
+//! `PageTop` automatically loads configuration settings by reading the following TOML files in
+//! order (all files are optional):
+//!
+//! 1. **config/common.toml**, for settings shared across all environments. This approach simplifies
+//!    maintenance by centralizing common configuration values.
+//!
+//! 2. **config/{rm}.toml**, where `{rm}` corresponds to the environment variable
+//!    `PAGETOP_RUN_MODE`:
+//!
+//!     * If `PAGETOP_RUN_MODE` is not set, it defaults to `default`, and `PageTop` attempts to load
+//!       *config/default.toml* if available.
+//!
+//!     * Useful for environment-specific configurations, ensuring that each environment
+//!       (e.g., development, staging, production) has its own settings without affecting others,
+//!       such as API keys, URLs, or performance-related adjustments.
+//!
+//! 3. **config/local.{rm}.toml**, useful for local machine-specific configurations:
+//!
+//!     * This file allows you to add or override settings specific to the environment. For example,
+//!       `local.devel.toml` for development or `local.production.toml` for production tweaks.
+//!
+//!     * It enables developers to tailor settings for their machines within a given environment and
+//!       is typically not shared or committed to version control systems.
+//!
+//! 4. **config/local.toml**, for general local settings across all environments, ideal for quick
+//!    adjustments or temporary values not tied to any specific environment.
+//!
+//! The configuration settings are merged in the order listed above, with later files overriding
+//! earlier ones if there are conflicts.
+//!
+//!
+//! # Adding configuration settings
+//!
+//! To give your **module** its own configuration settings, add [*serde*](https://docs.rs/serde) as
+//! a dependency in your *Cargo.toml* file with the `derive` feature enabled:
+//!
+//! ```toml
+//! [dependencies]
+//! serde = { version = "1.0", features = ["derive"] }
+//! ```
+//!
+//! Then, use the [`include_config!`](crate::include_config) macro to initialize your settings with
+//! type-safe structures and predefined values:
+//!
+//! ```
+//! use pagetop::prelude::*;
+//! use serde::Deserialize;
+//!
+//! include_config!(SETTINGS: Settings => [
+//!     // [myapp]
+//!     "myapp.name" => "Value Name",
+//!     "myapp.width" => 900,
+//!     "myapp.height" => 320,
+//! ]);
+//!
+//! #[derive(Debug, Deserialize)]
+//! pub struct Settings {
+//!    pub myapp: MyApp,
+//! }
+//!
+//! #[derive(Debug, Deserialize)]
+//! pub struct MyApp {
+//!     pub name: String,
+//!     pub description: Option<String>,
+//!     pub width: u16,
+//!     pub height: u16,
+//! }
+//! ```
+//!
+//! This is how global configuration settings are declared (see [`SETTINGS`](crate::global::SETTINGS)).
+//!
+//! You can add a new `[myapp]` section in the configuration files using the
+//! [TOML syntax](https://toml.io/en/v1.0.0#table), just like the `[log]` or `[server]` sections in
+//! the global settings (see [`Settings`](crate::global::Settings)).
+//!
+//! It is recommended to initialize all settings with predefined values or use `Option<T>` for
+//! optional settings handled within the code.
+//!
+//! If configuration settings fail to initialize correctly, the application will panic and stop
+//! execution.
+//!
+//! Configuration settings are always read-only.
+//!
+//!
+//! # Using your new configuration settings
+//!
+//! Access the settings directly in your code:
+//!
+//! ```
+//! use pagetop::prelude::*;
+//! use crate::config;
+//!
+//! fn global_settings() {
+//!     println!("App name: {}", &global::SETTINGS.app.name);
+//!     println!("App description: {}", &global::SETTINGS.app.description);
+//!     println!("Value of PAGETOP_RUN_MODE: {}", &global::SETTINGS.app.run_mode);
+//! }
+//!
+//! fn package_settings() {
+//!     println!("{} - {:?}", &config::SETTINGS.myapp.name, &config::SETTINGS.myapp.description);
+//!     println!("{}", &config::SETTINGS.myapp.width);
+//! }
+//! ```
+
+mod data;
+mod de;
+mod error;
+mod file;
+mod path;
+mod source;
+mod value;
+
+use crate::concat_string;
+use crate::config::data::ConfigData;
+use crate::config::file::File;
+
+use std::sync::LazyLock;
+
+use std::env;
+use std::path::Path;
+
+/// Original values read from configuration files in `key = value` pairs.
+pub static CONFIG_VALUES: LazyLock<ConfigData> = LazyLock::new(|| {
+    // Identify the configuration directory.
+    let config_dir = env::var("CARGO_MANIFEST_DIR")
+        .map(|manifest_dir| {
+            let manifest_config = Path::new(&manifest_dir).join("config");
+            if manifest_config.exists() {
+                manifest_config.to_string_lossy().to_string()
+            } else {
+                "config".to_string()
+            }
+        })
+        .unwrap_or_else(|_| "config".to_string());
+
+    // Execution mode based on the environment variable PAGETOP_RUN_MODE, defaults to 'default'.
+    let rm = env::var("PAGETOP_RUN_MODE").unwrap_or_else(|_| "default".into());
+
+    // Initialize config values.
+    let mut values = ConfigData::default();
+
+    // Merge (optional) configuration files and set the execution mode.
+    values
+        // First, add the common configuration for all environments. Defaults to 'common.toml'.
+        .merge(File::with_name(&concat_string!(config_dir, "/common.toml")).required(false))
+        .expect("Failed to merge common configuration (common.toml)")
+        // Add the environment-specific configuration. Defaults to 'default.toml'.
+        .merge(File::with_name(&concat_string!(config_dir, "/", rm, ".toml")).required(false))
+        .expect(&format!("Failed to merge {rm}.toml configuration"))
+        // Add reserved local configuration for the environment. Defaults to 'local.default.toml'.
+        .merge(File::with_name(&concat_string!(config_dir, "/local.", rm, ".toml")).required(false))
+        .expect("Failed to merge reserved local environment configuration")
+        // Add common reserved local configuration. Defaults to 'local.toml'.
+        .merge(File::with_name(&concat_string!(config_dir, "/local.toml")).required(false))
+        .expect("Failed to merge general reserved local configuration")
+        // Save the execution mode.
+        .set("app.run_mode", rm)
+        .expect("Failed to set application run mode");
+
+    values
+});
+
+#[macro_export]
+macro_rules! include_config {
+    ( $SETTINGS:ident: $Settings:ty => [ $($key:literal => $value:literal),* $(,)? ] ) => {
+        #[doc = concat!(
+            "Assigned or predefined values for configuration settings associated to the ",
+            "[`", stringify!($Settings), "`] type."
+        )]
+        pub static $SETTINGS: std::sync::LazyLock<$Settings> = std::sync::LazyLock::new(|| {
+            let mut settings = $crate::config::CONFIG_VALUES.clone();
+            $(
+                settings.set_default($key, $value).unwrap();
+            )*
+            match settings.try_into() {
+                Ok(s) => s,
+                Err(e) => panic!("Error parsing settings: {}", e),
+            }
+        });
+    };
+}
diff --git a/pagetop/src/config/data.rs b/pagetop/src/config/data.rs
new file mode 100644
index 00000000..22fe8359
--- /dev/null
+++ b/pagetop/src/config/data.rs
@@ -0,0 +1,136 @@
+use crate::config::error::*;
+use crate::config::path;
+use crate::config::source::Source;
+use crate::config::value::Value;
+
+use serde::de::Deserialize;
+
+use std::collections::HashMap;
+use std::fmt::Debug;
+
+#[derive(Clone, Debug)]
+enum ConfigKind {
+    // A mutable configuration. This is the default.
+    Mutable {
+        defaults: HashMap<path::Expression, Value>,
+        overrides: HashMap<path::Expression, Value>,
+        sources: Vec<Box<dyn Source + Send + Sync>>,
+    },
+}
+
+impl Default for ConfigKind {
+    fn default() -> Self {
+        ConfigKind::Mutable {
+            defaults: HashMap::new(),
+            overrides: HashMap::new(),
+            sources: Vec::new(),
+        }
+    }
+}
+
+/// A prioritized configuration repository. It maintains a set of configuration sources, fetches
+/// values to populate those, and provides them according to the source's priority.
+#[derive(Default, Clone, Debug)]
+pub struct ConfigData {
+    kind: ConfigKind,
+    /// Root of the cached configuration.
+    pub cache: Value,
+}
+
+impl ConfigData {
+    /// Merge in a configuration property source.
+    pub fn merge<T>(&mut self, source: T) -> Result<&mut ConfigData>
+    where
+        T: 'static,
+        T: Source + Send + Sync,
+    {
+        match self.kind {
+            ConfigKind::Mutable {
+                ref mut sources, ..
+            } => {
+                sources.push(Box::new(source));
+            }
+        }
+
+        self.refresh()
+    }
+
+    /// Refresh the configuration cache with fresh data from added sources.
+    ///
+    /// Configuration is automatically refreshed after a mutation operation (`set`, `merge`,
+    /// `set_default`, etc.).
+    pub fn refresh(&mut self) -> Result<&mut ConfigData> {
+        self.cache = match self.kind {
+            // TODO: We need to actually merge in all the stuff.
+            ConfigKind::Mutable {
+                ref overrides,
+                ref sources,
+                ref defaults,
+            } => {
+                let mut cache: Value = HashMap::<String, Value>::new().into();
+
+                // Add defaults.
+                for (key, val) in defaults {
+                    key.set(&mut cache, val.clone());
+                }
+
+                // Add sources.
+                sources.collect_to(&mut cache)?;
+
+                // Add overrides.
+                for (key, val) in overrides {
+                    key.set(&mut cache, val.clone());
+                }
+
+                cache
+            }
+        };
+
+        Ok(self)
+    }
+
+    pub fn set_default<T>(&mut self, key: &str, value: T) -> Result<&mut ConfigData>
+    where
+        T: Into<Value>,
+    {
+        match self.kind {
+            ConfigKind::Mutable {
+                ref mut defaults, ..
+            } => {
+                defaults.insert(key.parse()?, value.into());
+            }
+        };
+
+        self.refresh()
+    }
+
+    pub fn set<T>(&mut self, key: &str, value: T) -> Result<&mut ConfigData>
+    where
+        T: Into<Value>,
+    {
+        match self.kind {
+            ConfigKind::Mutable {
+                ref mut overrides, ..
+            } => {
+                overrides.insert(key.parse()?, value.into());
+            }
+        };
+
+        self.refresh()
+    }
+
+    /// Attempt to deserialize the entire configuration into the requested type.
+    pub fn try_into<'de, T: Deserialize<'de>>(self) -> Result<T> {
+        T::deserialize(self)
+    }
+}
+
+impl Source for ConfigData {
+    fn clone_into_box(&self) -> Box<dyn Source + Send + Sync> {
+        Box::new((*self).clone())
+    }
+
+    fn collect(&self) -> Result<HashMap<String, Value>> {
+        self.cache.clone().into_table()
+    }
+}
diff --git a/pagetop/src/config/de.rs b/pagetop/src/config/de.rs
new file mode 100644
index 00000000..875219af
--- /dev/null
+++ b/pagetop/src/config/de.rs
@@ -0,0 +1,462 @@
+use crate::config::data::ConfigData;
+use crate::config::error::*;
+use crate::config::value::{Table, Value, ValueKind};
+
+use serde::de;
+use serde::forward_to_deserialize_any;
+
+use std::collections::{HashMap, VecDeque};
+use std::iter::Enumerate;
+
+impl<'de> de::Deserializer<'de> for Value {
+    type Error = ConfigError;
+
+    #[inline]
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value>
+    where
+        V: de::Visitor<'de>,
+    {
+        // Deserialize based on the underlying type.
+        match self.kind {
+            ValueKind::Nil => visitor.visit_unit(),
+            ValueKind::Integer(i) => visitor.visit_i64(i),
+            ValueKind::Boolean(b) => visitor.visit_bool(b),
+            ValueKind::Float(f) => visitor.visit_f64(f),
+            ValueKind::String(s) => visitor.visit_string(s),
+            ValueKind::Array(values) => visitor.visit_seq(SeqAccess::new(values)),
+            ValueKind::Table(map) => visitor.visit_map(MapAccess::new(map)),
+        }
+    }
+
+    #[inline]
+    fn deserialize_bool<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_bool(self.into_bool()?)
+    }
+
+    #[inline]
+    fn deserialize_i8<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_i8(self.into_int()? as i8)
+    }
+
+    #[inline]
+    fn deserialize_i16<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_i16(self.into_int()? as i16)
+    }
+
+    #[inline]
+    fn deserialize_i32<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_i32(self.into_int()? as i32)
+    }
+
+    #[inline]
+    fn deserialize_i64<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_i64(self.into_int()?)
+    }
+
+    #[inline]
+    fn deserialize_u8<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_u8(self.into_int()? as u8)
+    }
+
+    #[inline]
+    fn deserialize_u16<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_u16(self.into_int()? as u16)
+    }
+
+    #[inline]
+    fn deserialize_u32<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_u32(self.into_int()? as u32)
+    }
+
+    #[inline]
+    fn deserialize_u64<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_u64(self.into_int()? as u64)
+    }
+
+    #[inline]
+    fn deserialize_f32<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_f32(self.into_float()? as f32)
+    }
+
+    #[inline]
+    fn deserialize_f64<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_f64(self.into_float()?)
+    }
+
+    #[inline]
+    fn deserialize_str<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_string(self.into_str()?)
+    }
+
+    #[inline]
+    fn deserialize_string<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_string(self.into_str()?)
+    }
+
+    #[inline]
+    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value>
+    where
+        V: de::Visitor<'de>,
+    {
+        // Match an explicit nil as None and everything else as Some.
+        match self.kind {
+            ValueKind::Nil => visitor.visit_none(),
+            _ => visitor.visit_some(self),
+        }
+    }
+
+    fn deserialize_newtype_struct<V>(self, _name: &'static str, visitor: V) -> Result<V::Value>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_newtype_struct(self)
+    }
+
+    fn deserialize_enum<V>(
+        self,
+        name: &'static str,
+        variants: &'static [&'static str],
+        visitor: V,
+    ) -> Result<V::Value>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_enum(EnumAccess {
+            value: self,
+            name,
+            variants,
+        })
+    }
+
+    forward_to_deserialize_any! {
+        char seq
+        bytes byte_buf map struct unit
+        identifier ignored_any unit_struct tuple_struct tuple
+    }
+}
+
+struct StrDeserializer<'a>(&'a str);
+
+impl<'de, 'a> de::Deserializer<'de> for StrDeserializer<'a> {
+    type Error = ConfigError;
+
+    #[inline]
+    fn deserialize_any<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_str(self.0)
+    }
+
+    forward_to_deserialize_any! {
+        bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
+        bytes byte_buf map struct unit enum newtype_struct
+        identifier ignored_any unit_struct tuple_struct tuple option
+    }
+}
+
+struct SeqAccess {
+    elements: Enumerate<::std::vec::IntoIter<Value>>,
+}
+
+impl SeqAccess {
+    fn new(elements: Vec<Value>) -> Self {
+        SeqAccess {
+            elements: elements.into_iter().enumerate(),
+        }
+    }
+}
+
+impl<'de> de::SeqAccess<'de> for SeqAccess {
+    type Error = ConfigError;
+
+    fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>>
+    where
+        T: de::DeserializeSeed<'de>,
+    {
+        match self.elements.next() {
+            Some((idx, value)) => seed
+                .deserialize(value)
+                .map(Some)
+                .map_err(|e| e.prepend_index(idx)),
+            None => Ok(None),
+        }
+    }
+
+    fn size_hint(&self) -> Option<usize> {
+        match self.elements.size_hint() {
+            (lower, Some(upper)) if lower == upper => Some(upper),
+            _ => None,
+        }
+    }
+}
+
+struct MapAccess {
+    elements: VecDeque<(String, Value)>,
+}
+
+impl MapAccess {
+    fn new(table: HashMap<String, Value>) -> Self {
+        MapAccess {
+            elements: table.into_iter().collect(),
+        }
+    }
+}
+
+impl<'de> de::MapAccess<'de> for MapAccess {
+    type Error = ConfigError;
+
+    fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>>
+    where
+        K: de::DeserializeSeed<'de>,
+    {
+        if let Some((key_s, _)) = self.elements.front() {
+            let key_de = Value::new(None, key_s as &str);
+            let key = de::DeserializeSeed::deserialize(seed, key_de)?;
+
+            Ok(Some(key))
+        } else {
+            Ok(None)
+        }
+    }
+
+    fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value>
+    where
+        V: de::DeserializeSeed<'de>,
+    {
+        let (key, value) = self.elements.pop_front().unwrap();
+        de::DeserializeSeed::deserialize(seed, value).map_err(|e| e.prepend_key(key))
+    }
+}
+
+struct EnumAccess {
+    value: Value,
+    name: &'static str,
+    variants: &'static [&'static str],
+}
+
+impl EnumAccess {
+    fn variant_deserializer(&self, name: &str) -> Result<StrDeserializer> {
+        self.variants
+            .iter()
+            .find(|&&s| s == name)
+            .map(|&s| StrDeserializer(s))
+            .ok_or_else(|| self.no_constructor_error(name))
+    }
+
+    fn table_deserializer(&self, table: &Table) -> Result<StrDeserializer> {
+        if table.len() == 1 {
+            self.variant_deserializer(table.iter().next().unwrap().0)
+        } else {
+            Err(self.structural_error())
+        }
+    }
+
+    fn no_constructor_error(&self, supposed_variant: &str) -> ConfigError {
+        ConfigError::Message(format!(
+            "enum {} does not have variant constructor {}",
+            self.name, supposed_variant
+        ))
+    }
+
+    fn structural_error(&self) -> ConfigError {
+        ConfigError::Message(format!(
+            "value of enum {} should be represented by either string or table with exactly one key",
+            self.name
+        ))
+    }
+}
+
+impl<'de> de::EnumAccess<'de> for EnumAccess {
+    type Error = ConfigError;
+    type Variant = Self;
+
+    fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant)>
+    where
+        V: de::DeserializeSeed<'de>,
+    {
+        let value = {
+            let deserializer = match self.value.kind {
+                ValueKind::String(ref s) => self.variant_deserializer(s),
+                ValueKind::Table(ref t) => self.table_deserializer(t),
+                _ => Err(self.structural_error()),
+            }?;
+            seed.deserialize(deserializer)?
+        };
+
+        Ok((value, self))
+    }
+}
+
+impl<'de> de::VariantAccess<'de> for EnumAccess {
+    type Error = ConfigError;
+
+    fn unit_variant(self) -> Result<()> {
+        Ok(())
+    }
+
+    fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value>
+    where
+        T: de::DeserializeSeed<'de>,
+    {
+        match self.value.kind {
+            ValueKind::Table(t) => seed.deserialize(t.into_iter().next().unwrap().1),
+            _ => unreachable!(),
+        }
+    }
+
+    fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value>
+    where
+        V: de::Visitor<'de>,
+    {
+        match self.value.kind {
+            ValueKind::Table(t) => {
+                de::Deserializer::deserialize_seq(t.into_iter().next().unwrap().1, visitor)
+            }
+            _ => unreachable!(),
+        }
+    }
+
+    fn struct_variant<V>(self, _fields: &'static [&'static str], visitor: V) -> Result<V::Value>
+    where
+        V: de::Visitor<'de>,
+    {
+        match self.value.kind {
+            ValueKind::Table(t) => {
+                de::Deserializer::deserialize_map(t.into_iter().next().unwrap().1, visitor)
+            }
+            _ => unreachable!(),
+        }
+    }
+}
+
+impl<'de> de::Deserializer<'de> for ConfigData {
+    type Error = ConfigError;
+
+    #[inline]
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value>
+    where
+        V: de::Visitor<'de>,
+    {
+        // Deserialize based on the underlying type.
+        match self.cache.kind {
+            ValueKind::Nil => visitor.visit_unit(),
+            ValueKind::Integer(i) => visitor.visit_i64(i),
+            ValueKind::Boolean(b) => visitor.visit_bool(b),
+            ValueKind::Float(f) => visitor.visit_f64(f),
+            ValueKind::String(s) => visitor.visit_string(s),
+            ValueKind::Array(values) => visitor.visit_seq(SeqAccess::new(values)),
+            ValueKind::Table(map) => visitor.visit_map(MapAccess::new(map)),
+        }
+    }
+
+    #[inline]
+    fn deserialize_bool<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_bool(self.cache.into_bool()?)
+    }
+
+    #[inline]
+    fn deserialize_i8<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_i8(self.cache.into_int()? as i8)
+    }
+
+    #[inline]
+    fn deserialize_i16<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_i16(self.cache.into_int()? as i16)
+    }
+
+    #[inline]
+    fn deserialize_i32<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_i32(self.cache.into_int()? as i32)
+    }
+
+    #[inline]
+    fn deserialize_i64<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_i64(self.cache.into_int()?)
+    }
+
+    #[inline]
+    fn deserialize_u8<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_u8(self.cache.into_int()? as u8)
+    }
+
+    #[inline]
+    fn deserialize_u16<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_u16(self.cache.into_int()? as u16)
+    }
+
+    #[inline]
+    fn deserialize_u32<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_u32(self.cache.into_int()? as u32)
+    }
+
+    #[inline]
+    fn deserialize_u64<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        // FIXME: This should *fail* if the value does not fit in the requets integer type.
+        visitor.visit_u64(self.cache.into_int()? as u64)
+    }
+
+    #[inline]
+    fn deserialize_f32<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_f32(self.cache.into_float()? as f32)
+    }
+
+    #[inline]
+    fn deserialize_f64<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_f64(self.cache.into_float()?)
+    }
+
+    #[inline]
+    fn deserialize_str<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_string(self.cache.into_str()?)
+    }
+
+    #[inline]
+    fn deserialize_string<V: de::Visitor<'de>>(self, visitor: V) -> Result<V::Value> {
+        visitor.visit_string(self.cache.into_str()?)
+    }
+
+    #[inline]
+    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value>
+    where
+        V: de::Visitor<'de>,
+    {
+        // Match an explicit nil as None and everything else as Some.
+        match self.cache.kind {
+            ValueKind::Nil => visitor.visit_none(),
+            _ => visitor.visit_some(self),
+        }
+    }
+
+    fn deserialize_enum<V>(
+        self,
+        name: &'static str,
+        variants: &'static [&'static str],
+        visitor: V,
+    ) -> Result<V::Value>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_enum(EnumAccess {
+            value: self.cache,
+            name,
+            variants,
+        })
+    }
+
+    forward_to_deserialize_any! {
+        char seq
+        bytes byte_buf map struct unit newtype_struct
+        identifier ignored_any unit_struct tuple_struct tuple
+    }
+}
diff --git a/pagetop/src/config/error.rs b/pagetop/src/config/error.rs
new file mode 100644
index 00000000..be3649c0
--- /dev/null
+++ b/pagetop/src/config/error.rs
@@ -0,0 +1,222 @@
+use nom;
+use serde::de;
+use serde::ser;
+
+use std::error::Error;
+use std::fmt;
+use std::result;
+
+#[derive(Debug)]
+pub enum Unexpected {
+    Bool(bool),
+    Integer(i64),
+    Float(f64),
+    Str(String),
+    Unit,
+    Seq,
+    Map,
+}
+
+impl fmt::Display for Unexpected {
+    fn fmt(&self, f: &mut fmt::Formatter) -> result::Result<(), fmt::Error> {
+        match *self {
+            Unexpected::Bool(b) => write!(f, "boolean `{}`", b),
+            Unexpected::Integer(i) => write!(f, "integer `{}`", i),
+            Unexpected::Float(v) => write!(f, "floating point `{}`", v),
+            Unexpected::Str(ref s) => write!(f, "string {:?}", s),
+            Unexpected::Unit => write!(f, "unit value"),
+            Unexpected::Seq => write!(f, "sequence"),
+            Unexpected::Map => write!(f, "map"),
+        }
+    }
+}
+
+/// Represents all possible errors that can occur when working with configuration.
+pub enum ConfigError {
+    /// Configuration is frozen and no further mutations can be made.
+    Frozen,
+
+    /// Configuration property was not found.
+    NotFound(String),
+
+    /// Configuration path could not be parsed.
+    PathParse(nom::error::ErrorKind),
+
+    /// Configuration could not be parsed from file.
+    FileParse {
+        /// The URI used to access the file (if not loaded from a string).
+        /// Example: `/path/to/config.json`
+        uri: Option<String>,
+
+        /// The captured error from attempting to parse the file in its desired format.
+        /// This is the actual error object from the library used for the parsing.
+        cause: Box<dyn Error + Send + Sync>,
+    },
+
+    /// Value could not be converted into the requested type.
+    Type {
+        /// The URI that references the source that the value came from.
+        /// Example: `/path/to/config.json` or `Environment` or `etcd://localhost`
+        // TODO: Why is this called Origin but FileParse has a uri field?
+        origin: Option<String>,
+
+        /// What we found when parsing the value.
+        unexpected: Unexpected,
+
+        /// What was expected when parsing the value.
+        expected: &'static str,
+
+        /// The key in the configuration hash of this value (if available where the error is
+        /// generated).
+        key: Option<String>,
+    },
+
+    /// Custom message.
+    Message(String),
+
+    /// Unadorned error from a foreign origin.
+    Foreign(Box<dyn Error + Send + Sync>),
+}
+
+impl ConfigError {
+    // FIXME: pub(crate).
+    #[doc(hidden)]
+    pub fn invalid_type(
+        origin: Option<String>,
+        unexpected: Unexpected,
+        expected: &'static str,
+    ) -> Self {
+        ConfigError::Type {
+            origin,
+            unexpected,
+            expected,
+            key: None,
+        }
+    }
+
+    // FIXME: pub(crate).
+    #[doc(hidden)]
+    pub fn extend_with_key(self, key: &str) -> Self {
+        match self {
+            ConfigError::Type {
+                origin,
+                unexpected,
+                expected,
+                ..
+            } => ConfigError::Type {
+                origin,
+                unexpected,
+                expected,
+                key: Some(key.into()),
+            },
+
+            _ => self,
+        }
+    }
+
+    fn prepend(self, segment: String, add_dot: bool) -> Self {
+        let concat = |key: Option<String>| {
+            let key = key.unwrap_or_default();
+            let dot = if add_dot && key.as_bytes().first().unwrap_or(&b'[') != &b'[' {
+                "."
+            } else {
+                ""
+            };
+            format!("{}{}{}", segment, dot, key)
+        };
+        match self {
+            ConfigError::Type {
+                origin,
+                unexpected,
+                expected,
+                key,
+            } => ConfigError::Type {
+                origin,
+                unexpected,
+                expected,
+                key: Some(concat(key)),
+            },
+            ConfigError::NotFound(key) => ConfigError::NotFound(concat(Some(key))),
+            _ => self,
+        }
+    }
+
+    pub(crate) fn prepend_key(self, key: String) -> Self {
+        self.prepend(key, true)
+    }
+
+    pub(crate) fn prepend_index(self, idx: usize) -> Self {
+        self.prepend(format!("[{}]", idx), false)
+    }
+}
+
+/// Alias for a `Result` with the error type set to `ConfigError`.
+pub type Result<T> = result::Result<T, ConfigError>;
+
+// Forward Debug to Display for readable panic! messages.
+impl fmt::Debug for ConfigError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", *self)
+    }
+}
+
+impl fmt::Display for ConfigError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            ConfigError::Frozen => write!(f, "configuration is frozen"),
+
+            ConfigError::PathParse(ref kind) => write!(f, "{}", kind.description()),
+
+            ConfigError::Message(ref s) => write!(f, "{}", s),
+
+            ConfigError::Foreign(ref cause) => write!(f, "{}", cause),
+
+            ConfigError::NotFound(ref key) => {
+                write!(f, "configuration property {:?} not found", key)
+            }
+
+            ConfigError::Type {
+                ref origin,
+                ref unexpected,
+                expected,
+                ref key,
+            } => {
+                write!(f, "invalid type: {}, expected {}", unexpected, expected)?;
+
+                if let Some(ref key) = *key {
+                    write!(f, " for key `{}`", key)?;
+                }
+
+                if let Some(ref origin) = *origin {
+                    write!(f, " in {}", origin)?;
+                }
+
+                Ok(())
+            }
+
+            ConfigError::FileParse { ref cause, ref uri } => {
+                write!(f, "{}", cause)?;
+
+                if let Some(ref uri) = *uri {
+                    write!(f, " in {}", uri)?;
+                }
+
+                Ok(())
+            }
+        }
+    }
+}
+
+impl Error for ConfigError {}
+
+impl de::Error for ConfigError {
+    fn custom<T: fmt::Display>(msg: T) -> Self {
+        ConfigError::Message(msg.to_string())
+    }
+}
+
+impl ser::Error for ConfigError {
+    fn custom<T: fmt::Display>(msg: T) -> Self {
+        ConfigError::Message(msg.to_string())
+    }
+}
diff --git a/pagetop/src/config/file.rs b/pagetop/src/config/file.rs
new file mode 100644
index 00000000..00f0c34d
--- /dev/null
+++ b/pagetop/src/config/file.rs
@@ -0,0 +1,85 @@
+mod source;
+mod toml;
+
+use crate::config::error::*;
+use crate::config::source::Source;
+use crate::config::value::Value;
+
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+
+use self::source::FileSource;
+
+#[derive(Clone, Debug)]
+pub struct File<T>
+where
+    T: FileSource,
+{
+    source: T,
+    /// A required File will error if it cannot be found.
+    required: bool,
+}
+
+impl File<source::FileSourceFile> {
+    /// Given the basename of a file, will attempt to locate a file by setting its extension to a
+    /// registered format.
+    pub fn with_name(name: &str) -> Self {
+        File {
+            source: source::FileSourceFile::new(name.into()),
+            required: true,
+        }
+    }
+}
+
+impl<'a> From<&'a Path> for File<source::FileSourceFile> {
+    fn from(path: &'a Path) -> Self {
+        File {
+            source: source::FileSourceFile::new(path.to_path_buf()),
+            required: true,
+        }
+    }
+}
+
+impl From<PathBuf> for File<source::FileSourceFile> {
+    fn from(path: PathBuf) -> Self {
+        File {
+            source: source::FileSourceFile::new(path),
+            required: true,
+        }
+    }
+}
+
+impl<T: FileSource> File<T> {
+    pub fn required(mut self, required: bool) -> Self {
+        self.required = required;
+        self
+    }
+}
+
+impl<T: FileSource> Source for File<T>
+where
+    T: 'static,
+    T: Sync + Send,
+{
+    fn clone_into_box(&self) -> Box<dyn Source + Send + Sync> {
+        Box::new((*self).clone())
+    }
+
+    fn collect(&self) -> Result<HashMap<String, Value>> {
+        // Coerce the file contents to a string.
+        let (uri, contents) = match self.source.resolve().map_err(ConfigError::Foreign) {
+            Ok((uri, contents)) => (uri, contents),
+
+            Err(error) => {
+                if !self.required {
+                    return Ok(HashMap::new());
+                }
+
+                return Err(error);
+            }
+        };
+
+        // Parse the string using the given format.
+        toml::parse(uri.as_ref(), &contents).map_err(|cause| ConfigError::FileParse { uri, cause })
+    }
+}
diff --git a/pagetop/src/config/file/source.rs b/pagetop/src/config/file/source.rs
new file mode 100644
index 00000000..46d9ff00
--- /dev/null
+++ b/pagetop/src/config/file/source.rs
@@ -0,0 +1,126 @@
+use std::env;
+use std::error::Error;
+use std::fmt::Debug;
+use std::fs;
+use std::io::{self, Read};
+use std::iter::Iterator;
+use std::path::{Path, PathBuf};
+
+/// Describes where the file is sourced.
+pub trait FileSource: Debug + Clone {
+    fn resolve(&self) -> Result<(Option<String>, String), Box<dyn Error + Send + Sync>>;
+}
+
+/// Describes a file sourced from a file.
+#[derive(Clone, Debug)]
+pub struct FileSourceFile {
+    /// Path of configuration file.
+    name: PathBuf,
+}
+
+impl FileSourceFile {
+    pub fn new(name: PathBuf) -> FileSourceFile {
+        FileSourceFile { name }
+    }
+
+    fn find_file(&self) -> Result<PathBuf, Box<dyn Error + Send + Sync>> {
+        // First check for an _exact_ match.
+        let mut filename = env::current_dir()?.as_path().join(self.name.clone());
+        if filename.is_file() {
+            if ["toml"].contains(
+                &filename
+                    .extension()
+                    .unwrap_or_default()
+                    .to_string_lossy()
+                    .as_ref(),
+            ) {
+                return Ok(filename);
+            }
+
+            Err(Box::new(io::Error::new(
+                io::ErrorKind::NotFound,
+                format!(
+                    "configuration file \"{}\" is not of a registered file format",
+                    filename.to_string_lossy()
+                ),
+            )))
+        } else {
+            filename.set_extension("toml");
+
+            if filename.is_file() {
+                return Ok(filename);
+            }
+
+            Err(Box::new(io::Error::new(
+                io::ErrorKind::NotFound,
+                format!(
+                    "configuration file \"{}\" not found",
+                    self.name.to_string_lossy()
+                ),
+            )))
+        }
+    }
+}
+
+impl FileSource for FileSourceFile {
+    fn resolve(&self) -> Result<(Option<String>, String), Box<dyn Error + Send + Sync>> {
+        // Find file.
+        let filename = self.find_file()?;
+
+        // Attempt to use a relative path for the URI.
+        let base = env::current_dir()?;
+        let uri = match path_relative_from(&filename, &base) {
+            Some(value) => value,
+            None => filename.clone(),
+        };
+
+        // Read contents from file.
+        let mut file = fs::File::open(filename)?;
+        let mut text = String::new();
+        file.read_to_string(&mut text)?;
+
+        Ok((Some(uri.to_string_lossy().into_owned()), text))
+    }
+}
+
+// TODO: This should probably be a crate.
+// https://github.com/rust-lang/rust/blob/master/src/librustc_trans/back/rpath.rs#L128
+fn path_relative_from(path: &Path, base: &Path) -> Option<PathBuf> {
+    use std::path::Component;
+
+    if path.is_absolute() != base.is_absolute() {
+        if path.is_absolute() {
+            Some(PathBuf::from(path))
+        } else {
+            None
+        }
+    } else {
+        let mut ita = path.components();
+        let mut itb = base.components();
+        let mut comps: Vec<Component> = vec![];
+        loop {
+            match (ita.next(), itb.next()) {
+                (None, None) => break,
+                (Some(a), None) => {
+                    comps.push(a);
+                    comps.extend(ita.by_ref());
+                    break;
+                }
+                (None, _) => comps.push(Component::ParentDir),
+                (Some(a), Some(b)) if comps.is_empty() && a == b => (),
+                (Some(a), Some(Component::CurDir)) => comps.push(a),
+                (Some(_), Some(Component::ParentDir)) => return None,
+                (Some(a), Some(_)) => {
+                    comps.push(Component::ParentDir);
+                    for _ in itb {
+                        comps.push(Component::ParentDir);
+                    }
+                    comps.push(a);
+                    comps.extend(ita.by_ref());
+                    break;
+                }
+            }
+        }
+        Some(comps.iter().map(|c| c.as_os_str()).collect())
+    }
+}
diff --git a/pagetop/src/config/file/toml.rs b/pagetop/src/config/file/toml.rs
new file mode 100644
index 00000000..e8fa06c6
--- /dev/null
+++ b/pagetop/src/config/file/toml.rs
@@ -0,0 +1,51 @@
+use crate::config::value::{Value, ValueKind};
+
+use toml;
+
+use std::collections::HashMap;
+use std::error::Error;
+
+pub fn parse(
+    uri: Option<&String>,
+    text: &str,
+) -> Result<HashMap<String, Value>, Box<dyn Error + Send + Sync>> {
+    // Parse a TOML value from the provided text.
+    // TODO: Have a proper error fire if the root of a file is ever not a Table
+    let value = from_toml_value(uri, &toml::from_str(text)?);
+    match value.kind {
+        ValueKind::Table(map) => Ok(map),
+
+        _ => Ok(HashMap::new()),
+    }
+}
+
+fn from_toml_value(uri: Option<&String>, value: &toml::Value) -> Value {
+    match *value {
+        toml::Value::String(ref value) => Value::new(uri, value.to_string()),
+        toml::Value::Float(value) => Value::new(uri, value),
+        toml::Value::Integer(value) => Value::new(uri, value),
+        toml::Value::Boolean(value) => Value::new(uri, value),
+
+        toml::Value::Table(ref table) => {
+            let mut m = HashMap::new();
+
+            for (key, value) in table {
+                m.insert(key.clone(), from_toml_value(uri, value));
+            }
+
+            Value::new(uri, m)
+        }
+
+        toml::Value::Array(ref array) => {
+            let mut l = Vec::new();
+
+            for value in array {
+                l.push(from_toml_value(uri, value));
+            }
+
+            Value::new(uri, l)
+        }
+
+        toml::Value::Datetime(ref datetime) => Value::new(uri, datetime.to_string()),
+    }
+}
diff --git a/pagetop/src/config/path.rs b/pagetop/src/config/path.rs
new file mode 100644
index 00000000..72376a95
--- /dev/null
+++ b/pagetop/src/config/path.rs
@@ -0,0 +1,167 @@
+use crate::config::error::*;
+use crate::config::value::{Value, ValueKind};
+
+use std::collections::HashMap;
+use std::str::FromStr;
+
+mod parser;
+
+#[derive(Debug, Eq, PartialEq, Clone, Hash)]
+pub enum Expression {
+    Identifier(String),
+    Child(Box<Expression>, String),
+    Subscript(Box<Expression>, isize),
+}
+
+impl FromStr for Expression {
+    type Err = ConfigError;
+
+    fn from_str(s: &str) -> Result<Expression> {
+        parser::from_str(s).map_err(ConfigError::PathParse)
+    }
+}
+
+fn sindex_to_uindex(index: isize, len: usize) -> usize {
+    if index >= 0 {
+        index as usize
+    } else {
+        len - (index.unsigned_abs())
+    }
+}
+
+impl Expression {
+    pub fn get_mut_forcibly<'a>(&self, root: &'a mut Value) -> Option<&'a mut Value> {
+        match *self {
+            Expression::Identifier(ref id) => match root.kind {
+                ValueKind::Table(ref mut map) => Some(
+                    map.entry(id.clone())
+                        .or_insert_with(|| Value::new(None, ValueKind::Nil)),
+                ),
+
+                _ => None,
+            },
+
+            Expression::Child(ref expr, ref key) => match expr.get_mut_forcibly(root) {
+                Some(value) => match value.kind {
+                    ValueKind::Table(ref mut map) => Some(
+                        map.entry(key.clone())
+                            .or_insert_with(|| Value::new(None, ValueKind::Nil)),
+                    ),
+
+                    _ => {
+                        *value = HashMap::<String, Value>::new().into();
+
+                        if let ValueKind::Table(ref mut map) = value.kind {
+                            Some(
+                                map.entry(key.clone())
+                                    .or_insert_with(|| Value::new(None, ValueKind::Nil)),
+                            )
+                        } else {
+                            unreachable!();
+                        }
+                    }
+                },
+
+                _ => None,
+            },
+
+            Expression::Subscript(ref expr, index) => match expr.get_mut_forcibly(root) {
+                Some(value) => {
+                    match value.kind {
+                        ValueKind::Array(_) => (),
+                        _ => *value = Vec::<Value>::new().into(),
+                    }
+
+                    match value.kind {
+                        ValueKind::Array(ref mut array) => {
+                            let index = sindex_to_uindex(index, array.len());
+
+                            if index >= array.len() {
+                                array.resize(index + 1, Value::new(None, ValueKind::Nil));
+                            }
+
+                            Some(&mut array[index])
+                        }
+
+                        _ => None,
+                    }
+                }
+                _ => None,
+            },
+        }
+    }
+
+    pub fn set(&self, root: &mut Value, value: Value) {
+        match *self {
+            Expression::Identifier(ref id) => {
+                // Ensure that root is a table.
+                match root.kind {
+                    ValueKind::Table(_) => {}
+
+                    _ => {
+                        *root = HashMap::<String, Value>::new().into();
+                    }
+                }
+
+                match value.kind {
+                    ValueKind::Table(ref incoming_map) => {
+                        // Pull out another table.
+                        let target = if let ValueKind::Table(ref mut map) = root.kind {
+                            map.entry(id.clone())
+                                .or_insert_with(|| HashMap::<String, Value>::new().into())
+                        } else {
+                            unreachable!();
+                        };
+
+                        // Continue the deep merge.
+                        for (key, val) in incoming_map {
+                            Expression::Identifier(key.clone()).set(target, val.clone());
+                        }
+                    }
+
+                    _ => {
+                        if let ValueKind::Table(ref mut map) = root.kind {
+                            // Just do a simple set.
+                            map.insert(id.clone(), value);
+                        }
+                    }
+                }
+            }
+
+            Expression::Child(ref expr, ref key) => {
+                if let Some(parent) = expr.get_mut_forcibly(root) {
+                    match parent.kind {
+                        ValueKind::Table(_) => {
+                            Expression::Identifier(key.clone()).set(parent, value);
+                        }
+
+                        _ => {
+                            // Didn't find a table. Oh well. Make a table and do this anyway.
+                            *parent = HashMap::<String, Value>::new().into();
+
+                            Expression::Identifier(key.clone()).set(parent, value);
+                        }
+                    }
+                }
+            }
+
+            Expression::Subscript(ref expr, index) => {
+                if let Some(parent) = expr.get_mut_forcibly(root) {
+                    match parent.kind {
+                        ValueKind::Array(_) => (),
+                        _ => *parent = Vec::<Value>::new().into(),
+                    }
+
+                    if let ValueKind::Array(ref mut array) = parent.kind {
+                        let uindex = sindex_to_uindex(index, array.len());
+                        if uindex >= array.len() {
+                            array.resize(uindex + 1, Value::new(None, ValueKind::Nil));
+                        }
+
+                        array[uindex] = value;
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/pagetop/src/config/path/parser.rs b/pagetop/src/config/path/parser.rs
new file mode 100644
index 00000000..6bc95276
--- /dev/null
+++ b/pagetop/src/config/path/parser.rs
@@ -0,0 +1,131 @@
+use super::Expression;
+
+use nom::{
+    branch::alt,
+    bytes::complete::{is_a, tag},
+    character::complete::{char, digit1, space0},
+    combinator::{map, map_res, opt, recognize},
+    error::ErrorKind,
+    sequence::{delimited, pair, preceded},
+    Err, IResult,
+};
+
+use std::str::FromStr;
+
+fn raw_ident(i: &str) -> IResult<&str, String> {
+    map(
+        is_a(
+            "abcdefghijklmnopqrstuvwxyz \
+         ABCDEFGHIJKLMNOPQRSTUVWXYZ \
+         0123456789 \
+         _-",
+        ),
+        |s: &str| s.to_string(),
+    )(i)
+}
+
+fn integer(i: &str) -> IResult<&str, isize> {
+    map_res(
+        delimited(space0, recognize(pair(opt(tag("-")), digit1)), space0),
+        FromStr::from_str,
+    )(i)
+}
+
+fn ident(i: &str) -> IResult<&str, Expression> {
+    map(raw_ident, Expression::Identifier)(i)
+}
+
+fn postfix<'a>(expr: Expression) -> impl FnMut(&'a str) -> IResult<&'a str, Expression> {
+    let e2 = expr.clone();
+    let child = map(preceded(tag("."), raw_ident), move |id| {
+        Expression::Child(Box::new(expr.clone()), id)
+    });
+
+    let subscript = map(delimited(char('['), integer, char(']')), move |num| {
+        Expression::Subscript(Box::new(e2.clone()), num)
+    });
+
+    alt((child, subscript))
+}
+
+pub fn from_str(input: &str) -> Result<Expression, ErrorKind> {
+    match ident(input) {
+        Ok((mut rem, mut expr)) => {
+            while !rem.is_empty() {
+                match postfix(expr)(rem) {
+                    Ok((rem_, expr_)) => {
+                        rem = rem_;
+                        expr = expr_;
+                    }
+
+                    // Forward Incomplete and Error
+                    result => {
+                        return result.map(|(_, o)| o).map_err(to_error_kind);
+                    }
+                }
+            }
+
+            Ok(expr)
+        }
+
+        // Forward Incomplete and Error
+        result => result.map(|(_, o)| o).map_err(to_error_kind),
+    }
+}
+
+pub fn to_error_kind(e: Err<nom::error::Error<&str>>) -> ErrorKind {
+    match e {
+        Err::Incomplete(_) => ErrorKind::Complete,
+        Err::Failure(e) | Err::Error(e) => e.code,
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::Expression::*;
+    use super::*;
+
+    #[test]
+    fn test_id() {
+        let parsed: Expression = from_str("abcd").unwrap();
+        assert_eq!(parsed, Identifier("abcd".into()));
+    }
+
+    #[test]
+    fn test_id_dash() {
+        let parsed: Expression = from_str("abcd-efgh").unwrap();
+        assert_eq!(parsed, Identifier("abcd-efgh".into()));
+    }
+
+    #[test]
+    fn test_child() {
+        let parsed: Expression = from_str("abcd.efgh").unwrap();
+        let expected = Child(Box::new(Identifier("abcd".into())), "efgh".into());
+
+        assert_eq!(parsed, expected);
+
+        let parsed: Expression = from_str("abcd.efgh.ijkl").unwrap();
+        let expected = Child(
+            Box::new(Child(Box::new(Identifier("abcd".into())), "efgh".into())),
+            "ijkl".into(),
+        );
+
+        assert_eq!(parsed, expected);
+    }
+
+    #[test]
+    fn test_subscript() {
+        let parsed: Expression = from_str("abcd[12]").unwrap();
+        let expected = Subscript(Box::new(Identifier("abcd".into())), 12);
+
+        assert_eq!(parsed, expected);
+    }
+
+    #[test]
+    fn test_subscript_neg() {
+        let parsed: Expression = from_str("abcd[-1]").unwrap();
+        let expected = Subscript(Box::new(Identifier("abcd".into())), -1);
+
+        assert_eq!(parsed, expected);
+    }
+}
diff --git a/pagetop/src/config/source.rs b/pagetop/src/config/source.rs
new file mode 100644
index 00000000..5e693b68
--- /dev/null
+++ b/pagetop/src/config/source.rs
@@ -0,0 +1,87 @@
+use crate::config::error::*;
+use crate::config::path;
+use crate::config::value::{Value, ValueKind};
+
+use std::collections::HashMap;
+use std::fmt::Debug;
+use std::str::FromStr;
+
+/// Describes a generic _source_ of configuration properties.
+pub trait Source: Debug {
+    fn clone_into_box(&self) -> Box<dyn Source + Send + Sync>;
+
+    /// Collect all configuration properties available from this source and return a HashMap.
+    fn collect(&self) -> Result<HashMap<String, Value>>;
+
+    fn collect_to(&self, cache: &mut Value) -> Result<()> {
+        let props = match self.collect() {
+            Ok(props) => props,
+            Err(error) => {
+                return Err(error);
+            }
+        };
+
+        for (key, val) in &props {
+            match path::Expression::from_str(key) {
+                // Set using the path.
+                Ok(expr) => expr.set(cache, val.clone()),
+
+                // Set diretly anyway.
+                _ => path::Expression::Identifier(key.clone()).set(cache, val.clone()),
+            }
+        }
+
+        Ok(())
+    }
+}
+
+impl Clone for Box<dyn Source + Send + Sync> {
+    fn clone(&self) -> Box<dyn Source + Send + Sync> {
+        self.clone_into_box()
+    }
+}
+
+impl Source for Vec<Box<dyn Source + Send + Sync>> {
+    fn clone_into_box(&self) -> Box<dyn Source + Send + Sync> {
+        Box::new((*self).clone())
+    }
+
+    fn collect(&self) -> Result<HashMap<String, Value>> {
+        let mut cache: Value = HashMap::<String, Value>::new().into();
+
+        for source in self {
+            source.collect_to(&mut cache)?;
+        }
+
+        if let ValueKind::Table(table) = cache.kind {
+            Ok(table)
+        } else {
+            unreachable!();
+        }
+    }
+}
+
+impl<T> Source for Vec<T>
+where
+    T: Source + Sync + Send,
+    T: Clone,
+    T: 'static,
+{
+    fn clone_into_box(&self) -> Box<dyn Source + Send + Sync> {
+        Box::new((*self).clone())
+    }
+
+    fn collect(&self) -> Result<HashMap<String, Value>> {
+        let mut cache: Value = HashMap::<String, Value>::new().into();
+
+        for source in self {
+            source.collect_to(&mut cache)?;
+        }
+
+        if let ValueKind::Table(table) = cache.kind {
+            Ok(table)
+        } else {
+            unreachable!();
+        }
+    }
+}
diff --git a/pagetop/src/config/value.rs b/pagetop/src/config/value.rs
new file mode 100644
index 00000000..29d62cfe
--- /dev/null
+++ b/pagetop/src/config/value.rs
@@ -0,0 +1,545 @@
+use crate::config::error::*;
+
+use serde::de::{Deserialize, Deserializer, Visitor};
+
+use std::collections::HashMap;
+use std::fmt;
+use std::fmt::Display;
+
+/// Underlying kind of the configuration value.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub enum ValueKind {
+    #[default]
+    Nil,
+    Boolean(bool),
+    Integer(i64),
+    Float(f64),
+    String(String),
+    Table(Table),
+    Array(Array),
+}
+
+pub type Array = Vec<Value>;
+pub type Table = HashMap<String, Value>;
+
+impl<T> From<Option<T>> for ValueKind
+where
+    T: Into<ValueKind>,
+{
+    fn from(value: Option<T>) -> Self {
+        match value {
+            Some(value) => value.into(),
+            None => ValueKind::Nil,
+        }
+    }
+}
+
+impl From<String> for ValueKind {
+    fn from(value: String) -> Self {
+        ValueKind::String(value)
+    }
+}
+
+impl<'a> From<&'a str> for ValueKind {
+    fn from(value: &'a str) -> Self {
+        ValueKind::String(value.into())
+    }
+}
+
+impl From<i64> for ValueKind {
+    fn from(value: i64) -> Self {
+        ValueKind::Integer(value)
+    }
+}
+
+impl From<f64> for ValueKind {
+    fn from(value: f64) -> Self {
+        ValueKind::Float(value)
+    }
+}
+
+impl From<bool> for ValueKind {
+    fn from(value: bool) -> Self {
+        ValueKind::Boolean(value)
+    }
+}
+
+impl<T> From<HashMap<String, T>> for ValueKind
+where
+    T: Into<Value>,
+{
+    fn from(values: HashMap<String, T>) -> Self {
+        let mut r = HashMap::new();
+
+        for (k, v) in values {
+            r.insert(k.clone(), v.into());
+        }
+
+        ValueKind::Table(r)
+    }
+}
+
+impl<T> From<Vec<T>> for ValueKind
+where
+    T: Into<Value>,
+{
+    fn from(values: Vec<T>) -> Self {
+        let mut l = Vec::new();
+
+        for v in values {
+            l.push(v.into());
+        }
+
+        ValueKind::Array(l)
+    }
+}
+
+impl Display for ValueKind {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            ValueKind::String(ref value) => write!(f, "{}", value),
+            ValueKind::Boolean(value) => write!(f, "{}", value),
+            ValueKind::Integer(value) => write!(f, "{}", value),
+            ValueKind::Float(value) => write!(f, "{}", value),
+            ValueKind::Nil => write!(f, "nil"),
+
+            // TODO: Figure out a nice Display for these
+            ValueKind::Table(ref table) => write!(f, "{:?}", table),
+            ValueKind::Array(ref array) => write!(f, "{:?}", array),
+        }
+    }
+}
+
+/// A configuration value.
+#[derive(Default, Debug, Clone, PartialEq)]
+pub struct Value {
+    /// A description of the original location of the value.
+    ///
+    /// A Value originating from a File might contain:
+    /// ```text
+    /// Settings.toml
+    /// ```
+    ///
+    /// A Value originating from the environment would contain:
+    /// ```text
+    /// the envrionment
+    /// ```
+    ///
+    /// A Value originating from a remote source might contain:
+    /// ```text
+    /// etcd+http://127.0.0.1:2379
+    /// ```
+    origin: Option<String>,
+
+    /// Underlying kind of the configuration value.
+    pub kind: ValueKind,
+}
+
+impl Value {
+    /// Create a new value instance that will remember its source uri.
+    pub fn new<V>(origin: Option<&String>, kind: V) -> Self
+    where
+        V: Into<ValueKind>,
+    {
+        Value {
+            origin: origin.cloned(),
+            kind: kind.into(),
+        }
+    }
+
+    /// Attempt to deserialize this value into the requested type.
+    pub fn try_into<'de, T: Deserialize<'de>>(self) -> Result<T> {
+        T::deserialize(self)
+    }
+
+    /// Returns `self` as a bool, if possible.
+    // FIXME: Should this not be `try_into_*` ?
+    pub fn into_bool(self) -> Result<bool> {
+        match self.kind {
+            ValueKind::Boolean(value) => Ok(value),
+            ValueKind::Integer(value) => Ok(value != 0),
+            ValueKind::Float(value) => Ok(value != 0.0),
+
+            ValueKind::String(ref value) => {
+                match value.to_lowercase().as_ref() {
+                    "1" | "true" | "on" | "yes" => Ok(true),
+                    "0" | "false" | "off" | "no" => Ok(false),
+
+                    // Unexpected string value
+                    s => Err(ConfigError::invalid_type(
+                        self.origin.clone(),
+                        Unexpected::Str(s.into()),
+                        "a boolean",
+                    )),
+                }
+            }
+
+            // Unexpected type
+            ValueKind::Nil => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Unit,
+                "a boolean",
+            )),
+            ValueKind::Table(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Map,
+                "a boolean",
+            )),
+            ValueKind::Array(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Seq,
+                "a boolean",
+            )),
+        }
+    }
+
+    /// Returns `self` into an i64, if possible.
+    // FIXME: Should this not be `try_into_*` ?
+    pub fn into_int(self) -> Result<i64> {
+        match self.kind {
+            ValueKind::Integer(value) => Ok(value),
+
+            ValueKind::String(ref s) => {
+                match s.to_lowercase().as_ref() {
+                    "true" | "on" | "yes" => Ok(1),
+                    "false" | "off" | "no" => Ok(0),
+                    _ => {
+                        s.parse().map_err(|_| {
+                            // Unexpected string
+                            ConfigError::invalid_type(
+                                self.origin.clone(),
+                                Unexpected::Str(s.clone()),
+                                "an integer",
+                            )
+                        })
+                    }
+                }
+            }
+
+            #[allow(clippy::bool_to_int_with_if)]
+            ValueKind::Boolean(value) => Ok(if value { 1 } else { 0 }),
+
+            ValueKind::Float(value) => Ok(value.round() as i64),
+
+            // Unexpected type
+            ValueKind::Nil => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Unit,
+                "an integer",
+            )),
+
+            ValueKind::Table(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Map,
+                "an integer",
+            )),
+
+            ValueKind::Array(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Seq,
+                "an integer",
+            )),
+        }
+    }
+
+    /// Returns `self` into a f64, if possible.
+    // FIXME: Should this not be `try_into_*` ?
+    pub fn into_float(self) -> Result<f64> {
+        match self.kind {
+            ValueKind::Float(value) => Ok(value),
+
+            ValueKind::String(ref s) => {
+                match s.to_lowercase().as_ref() {
+                    "true" | "on" | "yes" => Ok(1.0),
+                    "false" | "off" | "no" => Ok(0.0),
+                    _ => {
+                        s.parse().map_err(|_| {
+                            // Unexpected string
+                            ConfigError::invalid_type(
+                                self.origin.clone(),
+                                Unexpected::Str(s.clone()),
+                                "a floating point",
+                            )
+                        })
+                    }
+                }
+            }
+
+            ValueKind::Integer(value) => Ok(value as f64),
+            ValueKind::Boolean(value) => Ok(if value { 1.0 } else { 0.0 }),
+
+            // Unexpected type.
+            ValueKind::Nil => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Unit,
+                "a floating point",
+            )),
+            ValueKind::Table(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Map,
+                "a floating point",
+            )),
+            ValueKind::Array(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Seq,
+                "a floating point",
+            )),
+        }
+    }
+
+    /// Returns `self` into a str, if possible.
+    // FIXME: Should this not be `try_into_*` ?
+    pub fn into_str(self) -> Result<String> {
+        match self.kind {
+            ValueKind::String(value) => Ok(value),
+
+            ValueKind::Boolean(value) => Ok(value.to_string()),
+            ValueKind::Integer(value) => Ok(value.to_string()),
+            ValueKind::Float(value) => Ok(value.to_string()),
+
+            // Cannot convert.
+            ValueKind::Nil => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Unit,
+                "a string",
+            )),
+            ValueKind::Table(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Map,
+                "a string",
+            )),
+            ValueKind::Array(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Seq,
+                "a string",
+            )),
+        }
+    }
+
+    /// Returns `self` into an array, if possible.
+    // FIXME: Should this not be `try_into_*` ?
+    pub fn into_array(self) -> Result<Vec<Value>> {
+        match self.kind {
+            ValueKind::Array(value) => Ok(value),
+
+            // Cannot convert.
+            ValueKind::Float(value) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Float(value),
+                "an array",
+            )),
+            ValueKind::String(value) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Str(value),
+                "an array",
+            )),
+            ValueKind::Integer(value) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Integer(value),
+                "an array",
+            )),
+            ValueKind::Boolean(value) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Bool(value),
+                "an array",
+            )),
+            ValueKind::Nil => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Unit,
+                "an array",
+            )),
+            ValueKind::Table(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Map,
+                "an array",
+            )),
+        }
+    }
+
+    /// If the `Value` is a Table, returns the associated Map.
+    // FIXME: Should this not be `try_into_*` ?
+    pub fn into_table(self) -> Result<HashMap<String, Value>> {
+        match self.kind {
+            ValueKind::Table(value) => Ok(value),
+
+            // Cannot convert.
+            ValueKind::Float(value) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Float(value),
+                "a map",
+            )),
+            ValueKind::String(value) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Str(value),
+                "a map",
+            )),
+            ValueKind::Integer(value) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Integer(value),
+                "a map",
+            )),
+            ValueKind::Boolean(value) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Bool(value),
+                "a map",
+            )),
+            ValueKind::Nil => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Unit,
+                "a map",
+            )),
+            ValueKind::Array(_) => Err(ConfigError::invalid_type(
+                self.origin,
+                Unexpected::Seq,
+                "a map",
+            )),
+        }
+    }
+}
+
+impl<'de> Deserialize<'de> for Value {
+    #[inline]
+    fn deserialize<D>(deserializer: D) -> ::std::result::Result<Value, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct ValueVisitor;
+
+        impl<'de> Visitor<'de> for ValueVisitor {
+            type Value = Value;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("any valid configuration value")
+            }
+
+            #[inline]
+            fn visit_bool<E>(self, value: bool) -> ::std::result::Result<Value, E> {
+                Ok(value.into())
+            }
+
+            #[inline]
+            fn visit_i8<E>(self, value: i8) -> ::std::result::Result<Value, E> {
+                Ok((value as i64).into())
+            }
+
+            #[inline]
+            fn visit_i16<E>(self, value: i16) -> ::std::result::Result<Value, E> {
+                Ok((value as i64).into())
+            }
+
+            #[inline]
+            fn visit_i32<E>(self, value: i32) -> ::std::result::Result<Value, E> {
+                Ok((value as i64).into())
+            }
+
+            #[inline]
+            fn visit_i64<E>(self, value: i64) -> ::std::result::Result<Value, E> {
+                Ok(value.into())
+            }
+
+            #[inline]
+            fn visit_u8<E>(self, value: u8) -> ::std::result::Result<Value, E> {
+                Ok((value as i64).into())
+            }
+
+            #[inline]
+            fn visit_u16<E>(self, value: u16) -> ::std::result::Result<Value, E> {
+                Ok((value as i64).into())
+            }
+
+            #[inline]
+            fn visit_u32<E>(self, value: u32) -> ::std::result::Result<Value, E> {
+                Ok((value as i64).into())
+            }
+
+            #[inline]
+            fn visit_u64<E>(self, value: u64) -> ::std::result::Result<Value, E> {
+                // FIXME: This is bad
+                Ok((value as i64).into())
+            }
+
+            #[inline]
+            fn visit_f64<E>(self, value: f64) -> ::std::result::Result<Value, E> {
+                Ok(value.into())
+            }
+
+            #[inline]
+            fn visit_str<E>(self, value: &str) -> ::std::result::Result<Value, E>
+            where
+                E: ::serde::de::Error,
+            {
+                self.visit_string(String::from(value))
+            }
+
+            #[inline]
+            fn visit_string<E>(self, value: String) -> ::std::result::Result<Value, E> {
+                Ok(value.into())
+            }
+
+            #[inline]
+            fn visit_none<E>(self) -> ::std::result::Result<Value, E> {
+                Ok(Value::new(None, ValueKind::Nil))
+            }
+
+            #[inline]
+            fn visit_some<D>(self, deserializer: D) -> ::std::result::Result<Value, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                Deserialize::deserialize(deserializer)
+            }
+
+            #[inline]
+            fn visit_unit<E>(self) -> ::std::result::Result<Value, E> {
+                Ok(Value::new(None, ValueKind::Nil))
+            }
+
+            #[inline]
+            fn visit_seq<V>(self, mut visitor: V) -> ::std::result::Result<Value, V::Error>
+            where
+                V: ::serde::de::SeqAccess<'de>,
+            {
+                let mut vec = Array::new();
+
+                while let Some(elem) = visitor.next_element()? {
+                    vec.push(elem);
+                }
+
+                Ok(vec.into())
+            }
+
+            fn visit_map<V>(self, mut visitor: V) -> ::std::result::Result<Value, V::Error>
+            where
+                V: ::serde::de::MapAccess<'de>,
+            {
+                let mut values = Table::new();
+
+                while let Some((key, value)) = visitor.next_entry()? {
+                    values.insert(key, value);
+                }
+
+                Ok(values.into())
+            }
+        }
+
+        deserializer.deserialize_any(ValueVisitor)
+    }
+}
+
+impl<T> From<T> for Value
+where
+    T: Into<ValueKind>,
+{
+    fn from(value: T) -> Self {
+        Value {
+            origin: None,
+            kind: value.into(),
+        }
+    }
+}
+
+impl Display for Value {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.kind)
+    }
+}
diff --git a/pagetop/src/core.rs b/pagetop/src/core.rs
new file mode 100644
index 00000000..2d65eadf
--- /dev/null
+++ b/pagetop/src/core.rs
@@ -0,0 +1,87 @@
+//! Key types and functions for creating actions, components, packages, and themes.
+
+use crate::util::TypeInfo;
+
+use std::any::Any;
+
+/// A base trait that extends `Any` to provide metadata and dynamic type casting capabilities.
+pub trait AnyBase: Any {
+    /// Returns the full name of the type.
+    fn type_name(&self) -> &'static str;
+
+    /// Returns a short name for the type.
+    fn short_name(&self) -> &'static str;
+
+    /// Returns a reference to `dyn Any` for dynamic type casting.
+    fn as_any_ref(&self) -> &dyn Any;
+
+    /// Returns a mutable reference to `dyn Any` for dynamic type casting.
+    fn as_any_mut(&mut self) -> &mut dyn Any;
+}
+
+#[allow(clippy::inline_always)]
+impl<T: Any> AnyBase for T {
+    #[inline(always)]
+    fn type_name(&self) -> &'static str {
+        TypeInfo::FullName.of::<T>()
+    }
+
+    #[inline(always)]
+    fn short_name(&self) -> &'static str {
+        TypeInfo::ShortName.of::<T>()
+    }
+
+    #[inline(always)]
+    fn as_any_ref(&self) -> &dyn Any {
+        self
+    }
+
+    #[inline(always)]
+    fn as_any_mut(&mut self) -> &mut dyn Any {
+        self
+    }
+}
+
+/// A trait for advanced dynamic type manipulation and downcasting.
+pub trait AnyTo: AnyBase {
+    /// Checks if the type is of the specified type `T`.
+    #[inline]
+    fn is<T>(&self) -> bool
+    where
+        T: AnyBase,
+    {
+        self.as_any_ref().is::<T>()
+    }
+
+    /// Attempts to downcast a reference to the specified type `T`.
+    #[inline]
+    fn downcast_ref<T>(&self) -> Option<&T>
+    where
+        T: AnyBase,
+    {
+        self.as_any_ref().downcast_ref()
+    }
+
+    /// Attempts to downcast a mutable reference to the specified type `T`.
+    #[inline]
+    fn downcast_mut<T>(&mut self) -> Option<&mut T>
+    where
+        T: AnyBase,
+    {
+        self.as_any_mut().downcast_mut()
+    }
+}
+
+impl<T: ?Sized + AnyBase> AnyTo for T {}
+
+// API to define functions that alter the predefined behavior of the code.
+pub mod action;
+
+// API to build new components.
+pub mod component;
+
+// API to add new features with packages.
+pub mod package;
+
+// API to add new layouts with themes.
+pub mod theme;
diff --git a/pagetop/src/core/action.rs b/pagetop/src/core/action.rs
new file mode 100644
index 00000000..b960e8b8
--- /dev/null
+++ b/pagetop/src/core/action.rs
@@ -0,0 +1,19 @@
+mod definition;
+pub use definition::{ActionBase, ActionBox, ActionKey, ActionTrait};
+
+mod list;
+use list::ActionsList;
+
+mod all;
+pub(crate) use all::add_action;
+pub use all::dispatch_actions;
+
+#[macro_export]
+macro_rules! actions {
+    () => {
+        Vec::<ActionBox>::new()
+    };
+    ( $($action:expr),+ $(,)? ) => {{
+        vec![$(Box::new($action),)+]
+    }};
+}
diff --git a/pagetop/src/core/action/all.rs b/pagetop/src/core/action/all.rs
new file mode 100644
index 00000000..76256939
--- /dev/null
+++ b/pagetop/src/core/action/all.rs
@@ -0,0 +1,30 @@
+use crate::core::action::{ActionBox, ActionKey, ActionTrait, ActionsList};
+
+use std::collections::HashMap;
+use std::sync::{LazyLock, RwLock};
+
+// Registered actions.
+static ACTIONS: LazyLock<RwLock<HashMap<ActionKey, ActionsList>>> =
+    LazyLock::new(|| RwLock::new(HashMap::new()));
+
+pub fn add_action(action: ActionBox) {
+    let key = action.key();
+    let mut actions = ACTIONS.write().unwrap();
+    if let Some(list) = actions.get_mut(&key) {
+        list.add(action);
+    } else {
+        let mut list = ActionsList::new();
+        list.add(action);
+        actions.insert(key, list);
+    }
+}
+
+pub fn dispatch_actions<A, B, F>(key: &ActionKey, f: F)
+where
+    A: ActionTrait,
+    F: FnMut(&A) -> B,
+{
+    if let Some(list) = ACTIONS.read().unwrap().get(key) {
+        list.iter_map(f);
+    }
+}
diff --git a/pagetop/src/core/action/definition.rs b/pagetop/src/core/action/definition.rs
new file mode 100644
index 00000000..05ff8b79
--- /dev/null
+++ b/pagetop/src/core/action/definition.rs
@@ -0,0 +1,61 @@
+use crate::core::AnyBase;
+use crate::{TypeId, Weight};
+
+pub type ActionBox = Box<dyn ActionTrait>;
+
+#[derive(Eq, PartialEq, Hash)]
+pub struct ActionKey {
+    action_type_id: TypeId,
+    theme_type_id: Option<TypeId>,
+    referer_type_id: Option<TypeId>,
+    referer_id: Option<String>,
+}
+
+impl ActionKey {
+    pub fn new(
+        action_type_id: TypeId,
+        theme_type_id: Option<TypeId>,
+        referer_type_id: Option<TypeId>,
+        referer_id: Option<String>,
+    ) -> Self {
+        ActionKey {
+            action_type_id,
+            theme_type_id,
+            referer_type_id,
+            referer_id,
+        }
+    }
+}
+
+pub trait ActionBase {
+    fn key(&self) -> ActionKey;
+}
+
+pub trait ActionTrait: ActionBase + AnyBase + Send + Sync {
+    fn theme_type_id(&self) -> Option<TypeId> {
+        None
+    }
+
+    fn referer_type_id(&self) -> Option<TypeId> {
+        None
+    }
+
+    fn referer_id(&self) -> Option<String> {
+        None
+    }
+
+    fn weight(&self) -> Weight {
+        0
+    }
+}
+
+impl<A: ActionTrait> ActionBase for A {
+    fn key(&self) -> ActionKey {
+        ActionKey {
+            action_type_id: self.type_id(),
+            theme_type_id: self.theme_type_id(),
+            referer_type_id: self.referer_type_id(),
+            referer_id: self.referer_id(),
+        }
+    }
+}
diff --git a/pagetop/src/core/action/list.rs b/pagetop/src/core/action/list.rs
new file mode 100644
index 00000000..fec25027
--- /dev/null
+++ b/pagetop/src/core/action/list.rs
@@ -0,0 +1,43 @@
+use crate::core::action::{ActionBox, ActionTrait};
+use crate::core::AnyTo;
+use crate::trace;
+use crate::AutoDefault;
+
+use std::sync::RwLock;
+
+#[derive(AutoDefault)]
+pub struct ActionsList(RwLock<Vec<ActionBox>>);
+
+impl ActionsList {
+    pub fn new() -> Self {
+        ActionsList::default()
+    }
+
+    pub fn add(&mut self, action: ActionBox) {
+        let mut list = self.0.write().unwrap();
+        list.push(action);
+        list.sort_by_key(|a| a.weight());
+    }
+
+    pub fn iter_map<A, B, F>(&self, mut f: F)
+    where
+        Self: Sized,
+        A: ActionTrait,
+        F: FnMut(&A) -> B,
+    {
+        let _: Vec<_> = self
+            .0
+            .read()
+            .unwrap()
+            .iter()
+            .rev()
+            .map(|a| {
+                if let Some(action) = (**a).downcast_ref::<A>() {
+                    f(action);
+                } else {
+                    trace::error!("Failed to downcast action of type {}", (**a).type_name());
+                }
+            })
+            .collect();
+    }
+}
diff --git a/pagetop/src/core/component.rs b/pagetop/src/core/component.rs
new file mode 100644
index 00000000..5a02ee0e
--- /dev/null
+++ b/pagetop/src/core/component.rs
@@ -0,0 +1,14 @@
+mod context;
+pub use context::{AssetsOp, Context, ErrorParam};
+pub type FnContextualPath = fn(cx: &Context) -> &str;
+
+mod definition;
+pub use definition::{ComponentBase, ComponentTrait};
+
+mod classes;
+pub use classes::{ComponentClasses, ComponentClassesOp};
+
+mod children;
+pub use children::Children;
+pub use children::{ChildComponent, ChildOp};
+pub use children::{TypedComponent, TypedOp};
diff --git a/pagetop/src/core/component/children.rs b/pagetop/src/core/component/children.rs
new file mode 100644
index 00000000..9a5db05b
--- /dev/null
+++ b/pagetop/src/core/component/children.rs
@@ -0,0 +1,213 @@
+use crate::core::component::{ComponentTrait, Context};
+use crate::html::{html, Markup};
+use crate::{fn_builder, TypeId};
+
+use std::sync::{Arc, RwLock};
+
+#[derive(Clone)]
+pub struct ChildComponent(Arc<RwLock<dyn ComponentTrait>>);
+
+impl ChildComponent {
+    pub fn with(component: impl ComponentTrait) -> Self {
+        ChildComponent(Arc::new(RwLock::new(component)))
+    }
+
+    // ChildComponent RENDER.
+
+    pub fn render(&self, cx: &mut Context) -> Markup {
+        self.0.write().unwrap().render(cx)
+    }
+
+    // ChildComponent HELPERS.
+
+    fn type_id(&self) -> TypeId {
+        self.0.read().unwrap().type_id()
+    }
+
+    fn id(&self) -> String {
+        self.0.read().unwrap().id().unwrap_or_default()
+    }
+}
+
+// *************************************************************************************************
+
+pub struct TypedComponent<C: ComponentTrait>(Arc<RwLock<C>>);
+
+impl<C: ComponentTrait> Clone for TypedComponent<C> {
+    fn clone(&self) -> Self {
+        Self(self.0.clone())
+    }
+}
+
+impl<C: ComponentTrait> TypedComponent<C> {
+    pub fn with(component: C) -> Self {
+        TypedComponent(Arc::new(RwLock::new(component)))
+    }
+
+    // TypedComponent RENDER.
+
+    pub fn render(&self, cx: &mut Context) -> Markup {
+        self.0.write().unwrap().render(cx)
+    }
+
+    // TypedComponent HELPERS.
+
+    fn to_child(&self) -> ChildComponent {
+        ChildComponent(self.0.clone())
+    }
+}
+
+// *************************************************************************************************
+
+pub enum ChildOp {
+    Add(ChildComponent),
+    InsertAfterId(&'static str, ChildComponent),
+    InsertBeforeId(&'static str, ChildComponent),
+    Prepend(ChildComponent),
+    RemoveById(&'static str),
+    ReplaceById(&'static str, ChildComponent),
+    Reset,
+}
+
+pub enum TypedOp<C: ComponentTrait> {
+    Add(TypedComponent<C>),
+    InsertAfterId(&'static str, TypedComponent<C>),
+    InsertBeforeId(&'static str, TypedComponent<C>),
+    Prepend(TypedComponent<C>),
+    RemoveById(&'static str),
+    ReplaceById(&'static str, TypedComponent<C>),
+    Reset,
+}
+
+#[derive(Clone, Default)]
+pub struct Children(Vec<ChildComponent>);
+
+impl Children {
+    pub fn new() -> Self {
+        Children::default()
+    }
+
+    pub fn with(child: ChildComponent) -> Self {
+        Children::default().with_value(ChildOp::Add(child))
+    }
+
+    pub(crate) fn merge(mixes: &[Option<&Children>]) -> Self {
+        let mut opt = Children::default();
+        for m in mixes.iter().flatten() {
+            opt.0.append(&mut m.0.clone());
+        }
+        opt
+    }
+
+    // Children BUILDER.
+
+    #[fn_builder]
+    pub fn set_value(&mut self, op: ChildOp) -> &mut Self {
+        match op {
+            ChildOp::Add(any) => self.add(any),
+            ChildOp::InsertAfterId(id, any) => self.insert_after_id(id, any),
+            ChildOp::InsertBeforeId(id, any) => self.insert_before_id(id, any),
+            ChildOp::Prepend(any) => self.prepend(any),
+            ChildOp::RemoveById(id) => self.remove_by_id(id),
+            ChildOp::ReplaceById(id, any) => self.replace_by_id(id, any),
+            ChildOp::Reset => self.reset(),
+        };
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_typed<C: ComponentTrait + Default>(&mut self, op: TypedOp<C>) -> &mut Self {
+        match op {
+            TypedOp::Add(typed) => self.add(typed.to_child()),
+            TypedOp::InsertAfterId(id, typed) => self.insert_after_id(id, typed.to_child()),
+            TypedOp::InsertBeforeId(id, typed) => self.insert_before_id(id, typed.to_child()),
+            TypedOp::Prepend(typed) => self.prepend(typed.to_child()),
+            TypedOp::RemoveById(id) => self.remove_by_id(id),
+            TypedOp::ReplaceById(id, typed) => self.replace_by_id(id, typed.to_child()),
+            TypedOp::Reset => self.reset(),
+        };
+        self
+    }
+
+    #[inline]
+    fn add(&mut self, child: ChildComponent) {
+        self.0.push(child);
+    }
+
+    #[inline]
+    fn insert_after_id(&mut self, id: &str, child: ChildComponent) {
+        match self.0.iter().position(|c| c.id() == id) {
+            Some(index) => self.0.insert(index + 1, child),
+            _ => self.0.push(child),
+        };
+    }
+
+    #[inline]
+    fn insert_before_id(&mut self, id: &str, child: ChildComponent) {
+        match self.0.iter().position(|c| c.id() == id) {
+            Some(index) => self.0.insert(index, child),
+            _ => self.0.insert(0, child),
+        };
+    }
+
+    #[inline]
+    fn prepend(&mut self, child: ChildComponent) {
+        self.0.insert(0, child);
+    }
+
+    #[inline]
+    fn remove_by_id(&mut self, id: &str) {
+        if let Some(index) = self.0.iter().position(|c| c.id() == id) {
+            self.0.remove(index);
+        }
+    }
+
+    #[inline]
+    fn replace_by_id(&mut self, id: &str, child: ChildComponent) {
+        for c in &mut self.0 {
+            if c.id() == id {
+                *c = child;
+                break;
+            }
+        }
+    }
+
+    #[inline]
+    fn reset(&mut self) {
+        self.0.clear();
+    }
+
+    // Children GETTERS.
+
+    pub fn len(&self) -> usize {
+        self.0.len()
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+
+    pub fn get_by_id(&self, id: impl Into<String>) -> Option<&ChildComponent> {
+        let id = id.into();
+        self.0.iter().find(|c| c.id() == id)
+    }
+
+    pub fn iter_by_id(&self, id: impl Into<String>) -> impl Iterator<Item = &ChildComponent> {
+        let id = id.into();
+        self.0.iter().filter(move |&c| c.id() == id)
+    }
+
+    pub fn iter_by_type_id(&self, type_id: TypeId) -> impl Iterator<Item = &ChildComponent> {
+        self.0.iter().filter(move |&c| c.type_id() == type_id)
+    }
+
+    // Children RENDER.
+
+    pub fn render(&self, cx: &mut Context) -> Markup {
+        html! {
+            @for c in &self.0 {
+                (c.render(cx))
+            }
+        }
+    }
+}
diff --git a/pagetop/src/core/component/classes.rs b/pagetop/src/core/component/classes.rs
new file mode 100644
index 00000000..a61809c6
--- /dev/null
+++ b/pagetop/src/core/component/classes.rs
@@ -0,0 +1,19 @@
+use crate::core::component::ComponentBase;
+use crate::html::{ClassesOp, OptionClasses};
+
+pub trait ComponentClassesOp {
+    fn with_classes(self, op: ClassesOp, classes: impl Into<String>) -> Self;
+}
+
+pub trait ComponentClasses: ComponentBase + ComponentClassesOp {
+    fn set_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self;
+
+    fn classes(&self) -> &OptionClasses;
+}
+
+impl<C: ComponentBase + ComponentClasses> ComponentClassesOp for C {
+    fn with_classes(mut self, op: ClassesOp, classes: impl Into<String>) -> Self {
+        self.set_classes(op, classes);
+        self
+    }
+}
diff --git a/pagetop/src/core/component/context.rs b/pagetop/src/core/component/context.rs
new file mode 100644
index 00000000..45bdcb87
--- /dev/null
+++ b/pagetop/src/core/component/context.rs
@@ -0,0 +1,199 @@
+use crate::concat_string;
+use crate::core::component::ChildOp;
+use crate::core::theme::all::{theme_by_short_name, DEFAULT_THEME};
+use crate::core::theme::{ChildrenInRegions, ThemeRef};
+use crate::html::{html, Markup};
+use crate::html::{Assets, Favicon, JavaScript, StyleSheet};
+use crate::locale::{LanguageIdentifier, DEFAULT_LANGID};
+use crate::service::HttpRequest;
+use crate::util::TypeInfo;
+
+use std::collections::HashMap;
+use std::error::Error;
+use std::str::FromStr;
+
+use std::fmt;
+
+pub enum AssetsOp {
+    LangId(&'static LanguageIdentifier),
+    Theme(&'static str),
+    Layout(&'static str),
+    // Favicon.
+    SetFavicon(Option<Favicon>),
+    SetFaviconIfNone(Favicon),
+    // Stylesheets.
+    AddStyleSheet(StyleSheet),
+    RemoveStyleSheet(&'static str),
+    // JavaScripts.
+    AddJavaScript(JavaScript),
+    RemoveJavaScript(&'static str),
+}
+
+#[derive(Debug)]
+pub enum ErrorParam {
+    NotFound,
+    ParseError(String),
+}
+
+impl fmt::Display for ErrorParam {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ErrorParam::NotFound => write!(f, "Parameter not found"),
+            ErrorParam::ParseError(e) => write!(f, "Parse error: {e}"),
+        }
+    }
+}
+
+impl Error for ErrorParam {}
+
+#[rustfmt::skip]
+pub struct Context {
+    request   : HttpRequest,
+    langid    : &'static LanguageIdentifier,
+    theme     : ThemeRef,
+    layout    : &'static str,
+    favicon   : Option<Favicon>,
+    stylesheet: Assets<StyleSheet>,
+    javascript: Assets<JavaScript>,
+    regions   : ChildrenInRegions,
+    params    : HashMap<&'static str, String>,
+    id_counter: usize,
+}
+
+impl Context {
+    #[rustfmt::skip]
+    pub(crate) fn new(request: HttpRequest) -> Self {
+        Context {
+            request,
+            langid    : &DEFAULT_LANGID,
+            theme     : *DEFAULT_THEME,
+            layout    : "default",
+            favicon   : None,
+            stylesheet: Assets::<StyleSheet>::new(),
+            javascript: Assets::<JavaScript>::new(),
+            regions   : ChildrenInRegions::default(),
+            params    : HashMap::<&str, String>::new(),
+            id_counter: 0,
+        }
+    }
+
+    pub fn set_assets(&mut self, op: AssetsOp) -> &mut Self {
+        match op {
+            AssetsOp::LangId(langid) => {
+                self.langid = langid;
+            }
+            AssetsOp::Theme(theme_name) => {
+                self.theme = theme_by_short_name(theme_name).unwrap_or(*DEFAULT_THEME);
+            }
+            AssetsOp::Layout(layout) => {
+                self.layout = layout;
+            }
+            // Favicon.
+            AssetsOp::SetFavicon(favicon) => {
+                self.favicon = favicon;
+            }
+            AssetsOp::SetFaviconIfNone(icon) => {
+                if self.favicon.is_none() {
+                    self.favicon = Some(icon);
+                }
+            }
+            // Stylesheets.
+            AssetsOp::AddStyleSheet(css) => {
+                self.stylesheet.add(css);
+            }
+            AssetsOp::RemoveStyleSheet(path) => {
+                self.stylesheet.remove(path);
+            }
+            // JavaScripts.
+            AssetsOp::AddJavaScript(js) => {
+                self.javascript.add(js);
+            }
+            AssetsOp::RemoveJavaScript(path) => {
+                self.javascript.remove(path);
+            }
+        }
+        self
+    }
+
+    pub fn set_in_region(&mut self, region: &'static str, op: ChildOp) -> &mut Self {
+        self.regions.set_in_region(region, op);
+        self
+    }
+
+    pub fn set_param<T: FromStr + ToString>(&mut self, key: &'static str, value: &T) -> &mut Self {
+        self.params.insert(key, value.to_string());
+        self
+    }
+
+    // Context GETTERS.
+
+    pub fn request(&self) -> &HttpRequest {
+        &self.request
+    }
+
+    pub fn langid(&self) -> &LanguageIdentifier {
+        self.langid
+    }
+
+    pub fn theme(&self) -> ThemeRef {
+        self.theme
+    }
+
+    pub fn layout(&self) -> &str {
+        self.layout
+    }
+
+    pub fn regions(&self) -> &ChildrenInRegions {
+        &self.regions
+    }
+
+    pub fn get_param<T: FromStr + ToString>(&self, key: &'static str) -> Result<T, ErrorParam> {
+        self.params
+            .get(key)
+            .ok_or(ErrorParam::NotFound)
+            .and_then(|v| T::from_str(v).map_err(|_| ErrorParam::ParseError(v.clone())))
+    }
+
+    // Context RENDER.
+
+    pub fn render_assets(&mut self) -> Markup {
+        html! {
+            @if let Some(favicon) = &self.favicon {
+                (favicon.render())
+            }
+            (self.stylesheet.render())
+            (self.javascript.render())
+        }
+    }
+
+    pub fn render_region(&mut self, region: impl Into<String>) -> Markup {
+        self.regions
+            .all_in_region(self.theme, &region.into())
+            .render(self)
+    }
+
+    // Context EXTRAS.
+
+    pub fn remove_param(&mut self, key: &'static str) -> bool {
+        self.params.remove(key).is_some()
+    }
+
+    pub fn required_id<T>(&mut self, id: Option<String>) -> String {
+        if let Some(id) = id {
+            id
+        } else {
+            let prefix = TypeInfo::ShortName
+                .of::<T>()
+                .trim()
+                .replace(' ', "_")
+                .to_lowercase();
+            let prefix = if prefix.is_empty() {
+                "prefix".to_owned()
+            } else {
+                prefix
+            };
+            self.id_counter += 1;
+            concat_string!(prefix, "-", self.id_counter.to_string())
+        }
+    }
+}
diff --git a/pagetop/src/core/component/definition.rs b/pagetop/src/core/component/definition.rs
new file mode 100644
index 00000000..af33c943
--- /dev/null
+++ b/pagetop/src/core/component/definition.rs
@@ -0,0 +1,66 @@
+use crate::base::action;
+use crate::core::component::Context;
+use crate::core::AnyBase;
+use crate::html::{html, Markup, PrepareMarkup};
+use crate::util::TypeInfo;
+
+pub trait ComponentBase {
+    fn render(&mut self, cx: &mut Context) -> Markup;
+}
+
+pub trait ComponentTrait: AnyBase + ComponentBase + Send + Sync {
+    fn new() -> Self
+    where
+        Self: Sized;
+
+    fn name(&self) -> &'static str {
+        TypeInfo::ShortName.of::<Self>()
+    }
+
+    fn description(&self) -> Option<String> {
+        None
+    }
+
+    fn id(&self) -> Option<String> {
+        None
+    }
+
+    #[allow(unused_variables)]
+    fn setup_before_prepare(&mut self, cx: &mut Context) {}
+
+    #[allow(unused_variables)]
+    fn prepare_component(&self, cx: &mut Context) -> PrepareMarkup {
+        PrepareMarkup::None
+    }
+}
+
+impl<C: ComponentTrait> ComponentBase for C {
+    fn render(&mut self, cx: &mut Context) -> Markup {
+        if action::component::IsRenderable::dispatch(self, cx) {
+            // Comprueba el componente antes de prepararlo.
+            self.setup_before_prepare(cx);
+
+            // Acciones del tema antes de preparar el componente.
+            action::theme::BeforePrepare::dispatch(self, cx);
+
+            // Acciones de los módulos antes de preparar el componente.
+            action::component::BeforePrepare::dispatch(self, cx);
+
+            // Renderiza el componente.
+            let markup = match action::theme::RenderComponent::dispatch(self, cx) {
+                Some(html) => html,
+                None => self.prepare_component(cx).render(),
+            };
+
+            // Acciones del tema después de preparar el componente.
+            action::theme::AfterPrepare::dispatch(self, cx);
+
+            // Acciones de los módulos después de preparar el componente.
+            action::component::AfterPrepare::dispatch(self, cx);
+
+            markup
+        } else {
+            html! {}
+        }
+    }
+}
diff --git a/pagetop/src/core/package.rs b/pagetop/src/core/package.rs
new file mode 100644
index 00000000..e0c6a12e
--- /dev/null
+++ b/pagetop/src/core/package.rs
@@ -0,0 +1,4 @@
+mod definition;
+pub use definition::{PackageRef, PackageTrait};
+
+pub(crate) mod all;
diff --git a/pagetop/src/core/package/all.rs b/pagetop/src/core/package/all.rs
new file mode 100644
index 00000000..301d3a02
--- /dev/null
+++ b/pagetop/src/core/package/all.rs
@@ -0,0 +1,134 @@
+use crate::core::action::add_action;
+use crate::core::package::PackageRef;
+use crate::core::theme::all::THEMES;
+use crate::{global, include_files, include_files_service, service, trace};
+
+use std::sync::{LazyLock, RwLock};
+
+// PACKAGES ****************************************************************************************
+
+static ENABLED_PACKAGES: LazyLock<RwLock<Vec<PackageRef>>> =
+    LazyLock::new(|| RwLock::new(Vec::new()));
+
+static DROPPED_PACKAGES: LazyLock<RwLock<Vec<PackageRef>>> =
+    LazyLock::new(|| RwLock::new(Vec::new()));
+
+// REGISTER PACKAGES *******************************************************************************
+
+pub fn register_packages(root_package: Option<PackageRef>) {
+    // Initialize a list for packages to be enabled.
+    let mut enabled_list: Vec<PackageRef> = Vec::new();
+
+    // Add default theme to the enabled list.
+    add_to_enabled(&mut enabled_list, &crate::base::theme::Basic);
+
+    // If a root package is provided, add it to the enabled list.
+    if let Some(package) = root_package {
+        add_to_enabled(&mut enabled_list, package);
+    }
+
+    // Add default welcome page package to the enabled list.
+    add_to_enabled(&mut enabled_list, &crate::base::package::Welcome);
+
+    // Save the final list of enabled packages.
+    ENABLED_PACKAGES.write().unwrap().append(&mut enabled_list);
+
+    // Initialize a list for packages to be dropped.
+    let mut dropped_list: Vec<PackageRef> = Vec::new();
+    // If a root package is provided, analyze its dropped list.
+    if let Some(package) = root_package {
+        add_to_dropped(&mut dropped_list, package);
+    }
+    // Save the final list of dropped packages.
+    DROPPED_PACKAGES.write().unwrap().append(&mut dropped_list);
+}
+
+fn add_to_enabled(list: &mut Vec<PackageRef>, package: PackageRef) {
+    // Check if the package is not already in the enabled list to avoid duplicates.
+    if !list.iter().any(|p| p.type_id() == package.type_id()) {
+        // Add the package dependencies in reverse order first.
+        for d in package.dependencies().iter().rev() {
+            add_to_enabled(list, *d);
+        }
+
+        // Add the package itself to the enabled list.
+        list.push(package);
+
+        // Check if the package has an associated theme to register.
+        if let Some(theme) = package.theme() {
+            let mut registered_themes = THEMES.write().unwrap();
+            // Ensure the theme is not already registered to avoid duplicates.
+            if !registered_themes
+                .iter()
+                .any(|t| t.type_id() == theme.type_id())
+            {
+                registered_themes.push(theme);
+                trace::debug!("Enabling \"{}\" theme", theme.short_name());
+            }
+        } else {
+            trace::debug!("Enabling \"{}\" package", package.short_name());
+        }
+    }
+}
+
+fn add_to_dropped(list: &mut Vec<PackageRef>, package: PackageRef) {
+    // Iterate through packages recommended to be dropped.
+    for d in &package.drop_packages() {
+        // Check if the package is not already in the dropped list.
+        if !list.iter().any(|p| p.type_id() == d.type_id()) {
+            // Check if the package is currently enabled. If so, log a warning.
+            if ENABLED_PACKAGES
+                .read()
+                .unwrap()
+                .iter()
+                .any(|p| p.type_id() == package.type_id())
+            {
+                trace::warn!(
+                    "Trying to drop \"{}\" package which is enabled",
+                    package.short_name()
+                );
+            } else {
+                // If the package is not enabled, add it to the dropped list and log the action.
+                list.push(*d);
+                trace::debug!("Package \"{}\" dropped", d.short_name());
+                // Recursively add the dependencies of the dropped package to the dropped list.
+                // This ensures that all dependencies are also considered for dropping.
+                for dependency in &package.dependencies() {
+                    add_to_dropped(list, *dependency);
+                }
+            }
+        }
+    }
+}
+
+// REGISTER ACTIONS ********************************************************************************
+
+pub fn register_actions() {
+    for m in ENABLED_PACKAGES.read().unwrap().iter() {
+        for a in m.actions().into_iter() {
+            add_action(a);
+        }
+    }
+}
+
+// INIT PACKAGES ***********************************************************************************
+
+pub fn init_packages() {
+    trace::info!("Calling application bootstrap");
+    for m in ENABLED_PACKAGES.read().unwrap().iter() {
+        m.init();
+    }
+}
+
+// CONFIGURE SERVICES ******************************************************************************
+
+include_files!(assets);
+
+pub fn configure_services(scfg: &mut service::web::ServiceConfig) {
+    for m in ENABLED_PACKAGES.read().unwrap().iter() {
+        m.configure_service(scfg);
+    }
+    include_files_service!(
+        scfg, assets => "/", [&global::SETTINGS.dev.pagetop_project_dir, "static"]
+    );
+}
diff --git a/pagetop/src/core/package/definition.rs b/pagetop/src/core/package/definition.rs
new file mode 100644
index 00000000..b1d0a8c9
--- /dev/null
+++ b/pagetop/src/core/package/definition.rs
@@ -0,0 +1,39 @@
+use crate::core::action::ActionBox;
+use crate::core::theme::ThemeRef;
+use crate::core::AnyBase;
+use crate::locale::L10n;
+use crate::{actions, service};
+
+pub type PackageRef = &'static dyn PackageTrait;
+
+/// Los paquetes deben implementar este *trait*.
+pub trait PackageTrait: AnyBase + Send + Sync {
+    fn name(&self) -> L10n {
+        L10n::n(self.short_name())
+    }
+
+    fn description(&self) -> L10n {
+        L10n::default()
+    }
+
+    fn theme(&self) -> Option<ThemeRef> {
+        None
+    }
+
+    fn dependencies(&self) -> Vec<PackageRef> {
+        vec![]
+    }
+
+    fn drop_packages(&self) -> Vec<PackageRef> {
+        vec![]
+    }
+
+    fn actions(&self) -> Vec<ActionBox> {
+        actions![]
+    }
+
+    fn init(&self) {}
+
+    #[allow(unused_variables)]
+    fn configure_service(&self, scfg: &mut service::web::ServiceConfig) {}
+}
diff --git a/pagetop/src/core/theme.rs b/pagetop/src/core/theme.rs
new file mode 100644
index 00000000..adb99d59
--- /dev/null
+++ b/pagetop/src/core/theme.rs
@@ -0,0 +1,8 @@
+mod definition;
+pub use definition::{ThemeRef, ThemeTrait};
+
+mod regions;
+pub(crate) use regions::ChildrenInRegions;
+pub use regions::InRegion;
+
+pub(crate) mod all;
diff --git a/pagetop/src/core/theme/all.rs b/pagetop/src/core/theme/all.rs
new file mode 100644
index 00000000..6e10eae7
--- /dev/null
+++ b/pagetop/src/core/theme/all.rs
@@ -0,0 +1,31 @@
+use crate::core::theme::ThemeRef;
+use crate::global;
+
+use std::sync::{LazyLock, RwLock};
+
+// THEMES ******************************************************************************************
+
+pub static THEMES: LazyLock<RwLock<Vec<ThemeRef>>> = LazyLock::new(|| RwLock::new(Vec::new()));
+
+// DEFAULT THEME ***********************************************************************************
+
+pub static DEFAULT_THEME: LazyLock<ThemeRef> =
+    LazyLock::new(|| match theme_by_short_name(&global::SETTINGS.app.theme) {
+        Some(theme) => theme,
+        None => &crate::base::theme::Basic,
+    });
+
+// THEME BY NAME ***********************************************************************************
+
+pub fn theme_by_short_name(short_name: &str) -> Option<ThemeRef> {
+    let short_name = short_name.to_lowercase();
+    match THEMES
+        .read()
+        .unwrap()
+        .iter()
+        .find(|t| t.short_name().to_lowercase() == short_name)
+    {
+        Some(theme) => Some(*theme),
+        _ => None,
+    }
+}
diff --git a/pagetop/src/core/theme/definition.rs b/pagetop/src/core/theme/definition.rs
new file mode 100644
index 00000000..01e1cb04
--- /dev/null
+++ b/pagetop/src/core/theme/definition.rs
@@ -0,0 +1,59 @@
+use crate::core::package::PackageTrait;
+use crate::global;
+use crate::html::{html, Markup};
+use crate::locale::L10n;
+use crate::response::page::Page;
+
+pub type ThemeRef = &'static dyn ThemeTrait;
+
+/// Los temas deben implementar este "trait".
+pub trait ThemeTrait: PackageTrait + Send + Sync {
+    fn regions(&self) -> Vec<(&'static str, L10n)> {
+        vec![("content", L10n::l("content"))]
+    }
+
+    fn render_head(&self, page: &mut Page) -> Markup {
+        let viewport = "width=device-width, initial-scale=1, shrink-to-fit=no";
+        html! {
+            head {
+                meta charset="utf-8";
+
+                @if let Some(title) = page.title() {
+                    title { (global::SETTINGS.app.name) (" | ") (title) }
+                } @else {
+                    title { (global::SETTINGS.app.name) }
+                }
+
+                @if let Some(description) = page.description() {
+                    meta name="description" content=(description);
+                }
+
+                meta name="viewport" content=(viewport);
+                @for (name, content) in page.metadata() {
+                    meta name=(name) content=(content) {}
+                }
+
+                meta http-equiv="X-UA-Compatible" content="IE=edge";
+                @for (property, content) in page.properties() {
+                    meta property=(property) content=(content) {}
+                }
+
+                (page.context().render_assets())
+            }
+        }
+    }
+
+    #[allow(unused_variables)]
+    fn before_render_body(&self, page: &mut Page) {}
+
+    fn render_body(&self, page: &mut Page) -> Markup {
+        html! {
+            body id=[page.body_id().get()] class=[page.body_classes().get()] {
+                (page.context().render_region("content"))
+            }
+        }
+    }
+
+    #[allow(unused_variables)]
+    fn after_render_body(&self, page: &mut Page) {}
+}
diff --git a/pagetop/src/core/theme/regions.rs b/pagetop/src/core/theme/regions.rs
new file mode 100644
index 00000000..7e8128c5
--- /dev/null
+++ b/pagetop/src/core/theme/regions.rs
@@ -0,0 +1,78 @@
+use crate::core::component::{ChildComponent, ChildOp, Children};
+use crate::core::theme::ThemeRef;
+use crate::{fn_builder, AutoDefault, TypeId};
+
+use std::collections::HashMap;
+use std::sync::{LazyLock, RwLock};
+
+static THEME_REGIONS: LazyLock<RwLock<HashMap<TypeId, ChildrenInRegions>>> =
+    LazyLock::new(|| RwLock::new(HashMap::new()));
+
+static COMMON_REGIONS: LazyLock<RwLock<ChildrenInRegions>> =
+    LazyLock::new(|| RwLock::new(ChildrenInRegions::default()));
+
+#[derive(AutoDefault)]
+pub struct ChildrenInRegions(HashMap<&'static str, Children>);
+
+impl ChildrenInRegions {
+    pub fn new() -> Self {
+        ChildrenInRegions::default()
+    }
+
+    pub fn with(region: &'static str, child: ChildComponent) -> Self {
+        ChildrenInRegions::default().with_in_region(region, ChildOp::Add(child))
+    }
+
+    #[fn_builder]
+    pub fn set_in_region(&mut self, region: &'static str, op: ChildOp) -> &mut Self {
+        if let Some(region) = self.0.get_mut(region) {
+            region.set_value(op);
+        } else {
+            self.0.insert(region, Children::new().with_value(op));
+        }
+        self
+    }
+
+    pub fn all_in_region(&self, theme: ThemeRef, region: &str) -> Children {
+        let common = COMMON_REGIONS.read().unwrap();
+        if let Some(r) = THEME_REGIONS.read().unwrap().get(&theme.type_id()) {
+            Children::merge(&[common.0.get(region), self.0.get(region), r.0.get(region)])
+        } else {
+            Children::merge(&[common.0.get(region), self.0.get(region)])
+        }
+    }
+}
+
+pub enum InRegion {
+    Content,
+    Named(&'static str),
+    OfTheme(&'static str, ThemeRef),
+}
+
+impl InRegion {
+    pub fn add(&self, child: ChildComponent) -> &Self {
+        match self {
+            InRegion::Content => {
+                COMMON_REGIONS
+                    .write()
+                    .unwrap()
+                    .set_in_region("content", ChildOp::Add(child));
+            }
+            InRegion::Named(name) => {
+                COMMON_REGIONS
+                    .write()
+                    .unwrap()
+                    .set_in_region(name, ChildOp::Add(child));
+            }
+            InRegion::OfTheme(region, theme) => {
+                let mut regions = THEME_REGIONS.write().unwrap();
+                if let Some(r) = regions.get_mut(&theme.type_id()) {
+                    r.set_in_region(region, ChildOp::Add(child));
+                } else {
+                    regions.insert(theme.type_id(), ChildrenInRegions::with(region, child));
+                }
+            }
+        }
+        self
+    }
+}
diff --git a/pagetop/src/datetime.rs b/pagetop/src/datetime.rs
new file mode 100644
index 00000000..732431df
--- /dev/null
+++ b/pagetop/src/datetime.rs
@@ -0,0 +1,4 @@
+//! [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) date and time handling
+//! ([chrono](https://docs.rs/chrono)).
+
+pub use chrono::prelude::*;
diff --git a/pagetop/src/global.rs b/pagetop/src/global.rs
new file mode 100644
index 00000000..e538958b
--- /dev/null
+++ b/pagetop/src/global.rs
@@ -0,0 +1,121 @@
+//! Global settings.
+
+use crate::include_config;
+
+use serde::Deserialize;
+
+include_config!(SETTINGS: Settings => [
+    // [app]
+    "app.name"                => "My App",
+    "app.description"         => "Developed with the amazing PageTop framework.",
+    "app.theme"               => "",
+    "app.language"            => "en-US",
+    "app.text_direction"      => "ltr",
+    "app.startup_banner"      => "Slant",
+
+    // [dev]
+    "dev.pagetop_project_dir" => "",
+
+    // [log]
+    "log.tracing"             => "Info",
+    "log.rolling"             => "Stdout",
+    "log.path"                => "log",
+    "log.prefix"              => "tracing.log",
+    "log.format"              => "Full",
+
+    // [server]
+    "server.bind_address"     => "localhost",
+    "server.bind_port"        => 8088,
+    "server.session_lifetime" => 604_800,
+]);
+
+#[derive(Debug, Deserialize)]
+/// Configuration settings for the global [`[app]`](App), [`[dev]`](Dev), [`[log]`](Log), and
+/// [`[server]`](Server) sections (see [`SETTINGS`]).
+pub struct Settings {
+    pub app: App,
+    pub dev: Dev,
+    pub log: Log,
+    pub server: Server,
+}
+
+#[derive(Debug, Deserialize)]
+/// Section `[app]` of the configuration settings.
+///
+/// See [`Settings`].
+pub struct App {
+    /// The name of the application.
+    /// Default: *"My App"*.
+    pub name: String,
+    /// A brief description of the application.
+    /// Default: *"Developed with the amazing PageTop framework."*.
+    pub description: String,
+    /// Default theme.
+    /// Default: *""*.
+    pub theme: String,
+    /// Default language (localization).
+    /// Default: *"en-US"*.
+    pub language: String,
+    /// Default text direction: *"ltr"* (left-to-right), *"rtl"* (right-to-left), or *"auto"*.
+    /// Default: *"ltr"*.
+    pub text_direction: String,
+    /// ASCII banner printed at startup: *"Off"*, *"Slant"*, *"Small"*, *"Speed"*, or *"Starwars"*.
+    /// Default: *"Slant"*.
+    pub startup_banner: String,
+    /// Default: according to the `PAGETOP_RUN_MODE` environment variable, or *"default"* if unset.
+    pub run_mode: String,
+}
+
+#[derive(Debug, Deserialize)]
+/// Section `[dev]` of the configuration settings.
+///
+/// See [`Settings`].
+pub struct Dev {
+    /// Static files required by the application are integrated by default into the executable
+    /// binary. However, during development, it can be useful to serve these files from their own
+    /// directory to avoid recompilation every time they are modified. In this case, specify the
+    /// full path to the project's root directory.
+    /// Default: *""*.
+    pub pagetop_project_dir: String,
+}
+
+#[derive(Debug, Deserialize)]
+/// Section `[log]` of the configuration settings.
+///
+/// See [`Settings`].
+pub struct Log {
+    /// Filter, or a comma-separated combination of filters, for execution traces: *"Error"*,
+    /// *"Warn"*, *"Info"*, *"Debug"*, or *"Trace"*.
+    /// Example: "Error,actix_server::builder=Info,tracing_actix_web=Debug".
+    /// Default: *"Info"*.
+    pub tracing: String,
+    /// Displays traces in the terminal (*"Stdout"*) or logs them in files with rotation: *"Daily"*,
+    /// *"Hourly"*, *"Minutely"*, or *"Endless"*.
+    /// Default: *"Stdout"*.
+    pub rolling: String,
+    /// Directory for trace files (if `rolling` != *"Stdout"*).
+    /// Default: *"log"*.
+    pub path: String,
+    /// Prefix for trace files (if `rolling` != *"Stdout"*).
+    /// Default: *"tracing.log"*.
+    pub prefix: String,
+    /// Trace output format. Options are *"Full"*, *"Compact"*, *"Pretty"*, or *"Json"*.
+    /// Default: *"Full"*.
+    pub format: String,
+}
+
+#[derive(Debug, Deserialize)]
+/// Section `[server]` of the configuration settings.
+///
+/// See [`Settings`].
+pub struct Server {
+    /// Web server bind address.
+    /// Default: *"localhost"*.
+    pub bind_address: String,
+    /// Web server bind port.
+    /// Default: *8088*.
+    pub bind_port: u16,
+    /// Session cookie duration in seconds (0 means "until the browser is closed").
+    /// Default: *604800* (7 days).
+    pub session_lifetime: i64,
+}
diff --git a/pagetop/src/html.rs b/pagetop/src/html.rs
new file mode 100644
index 00000000..939316b7
--- /dev/null
+++ b/pagetop/src/html.rs
@@ -0,0 +1,52 @@
+//! HTML in code.
+
+mod maud;
+pub use maud::{html, html_private, Markup, PreEscaped, DOCTYPE};
+
+mod assets;
+pub use assets::favicon::Favicon;
+pub use assets::javascript::JavaScript;
+pub use assets::stylesheet::{StyleSheet, TargetMedia};
+pub(crate) use assets::Assets;
+
+mod opt_id;
+pub use opt_id::OptionId;
+
+mod opt_name;
+pub use opt_name::OptionName;
+
+mod opt_string;
+pub use opt_string::OptionString;
+
+mod opt_translated;
+pub use opt_translated::OptionTranslated;
+
+mod opt_classes;
+pub use opt_classes::{ClassesOp, OptionClasses};
+
+mod opt_component;
+pub use opt_component::OptionComponent;
+
+pub mod unit;
+
+use crate::AutoDefault;
+
+#[derive(AutoDefault)]
+pub enum PrepareMarkup {
+    #[default]
+    None,
+    Text(&'static str),
+    Escaped(String),
+    With(Markup),
+}
+
+impl PrepareMarkup {
+    pub fn render(&self) -> Markup {
+        match self {
+            PrepareMarkup::None => html! {},
+            PrepareMarkup::Text(text) => html! { (text) },
+            PrepareMarkup::Escaped(string) => html! { (PreEscaped(string)) },
+            PrepareMarkup::With(markup) => html! { (markup) },
+        }
+    }
+}
diff --git a/pagetop/src/html/assets.rs b/pagetop/src/html/assets.rs
new file mode 100644
index 00000000..c8b8f1b9
--- /dev/null
+++ b/pagetop/src/html/assets.rs
@@ -0,0 +1,53 @@
+pub mod favicon;
+pub mod javascript;
+pub mod stylesheet;
+
+use crate::html::{html, Markup};
+use crate::{AutoDefault, Weight};
+
+pub trait AssetsTrait {
+    fn name(&self) -> &String;
+
+    fn weight(&self) -> Weight;
+
+    fn render(&self) -> Markup;
+}
+
+#[derive(AutoDefault)]
+pub(crate) struct Assets<T>(Vec<T>);
+
+impl<T: AssetsTrait> Assets<T> {
+    pub fn new() -> Self {
+        Assets::<T>(Vec::<T>::new())
+    }
+
+    pub fn add(&mut self, asset: T) -> &mut Self {
+        match self.0.iter().position(|x| x.name() == asset.name()) {
+            Some(index) => {
+                if self.0[index].weight() > asset.weight() {
+                    self.0.remove(index);
+                    self.0.push(asset);
+                }
+            }
+            _ => self.0.push(asset),
+        };
+        self
+    }
+
+    pub fn remove(&mut self, name: &'static str) -> &mut Self {
+        if let Some(index) = self.0.iter().position(|x| x.name() == name) {
+            self.0.remove(index);
+        };
+        self
+    }
+
+    pub fn render(&mut self) -> Markup {
+        let assets = &mut self.0;
+        assets.sort_by_key(AssetsTrait::weight);
+        html! {
+            @for a in assets {
+                (a.render())
+            }
+        }
+    }
+}
diff --git a/pagetop/src/html/assets/favicon.rs b/pagetop/src/html/assets/favicon.rs
new file mode 100644
index 00000000..366da4ff
--- /dev/null
+++ b/pagetop/src/html/assets/favicon.rs
@@ -0,0 +1,93 @@
+use crate::html::{html, Markup};
+use crate::AutoDefault;
+
+#[derive(AutoDefault)]
+pub struct Favicon(Vec<Markup>);
+
+impl Favicon {
+    pub fn new() -> Self {
+        Favicon::default()
+    }
+
+    // Favicon BUILDER.
+
+    pub fn with_icon(self, image: &str) -> Self {
+        self.add_icon_item("icon", image, None, None)
+    }
+
+    pub fn with_icon_for_sizes(self, image: &str, sizes: &str) -> Self {
+        self.add_icon_item("icon", image, Some(sizes), None)
+    }
+
+    pub fn with_apple_touch_icon(self, image: &str, sizes: &str) -> Self {
+        self.add_icon_item("apple-touch-icon", image, Some(sizes), None)
+    }
+
+    pub fn with_mask_icon(self, image: &str, color: &str) -> Self {
+        self.add_icon_item("mask-icon", image, None, Some(color))
+    }
+
+    pub fn with_manifest(self, file: &str) -> Self {
+        self.add_icon_item("manifest", file, None, None)
+    }
+
+    pub fn with_theme_color(mut self, color: &str) -> Self {
+        self.0.push(html! {
+            meta name="theme-color" content=(color);
+        });
+        self
+    }
+
+    pub fn with_ms_tile_color(mut self, color: &str) -> Self {
+        self.0.push(html! {
+            meta name="msapplication-TileColor" content=(color);
+        });
+        self
+    }
+
+    pub fn with_ms_tile_image(mut self, image: &str) -> Self {
+        self.0.push(html! {
+            meta name="msapplication-TileImage" content=(image);
+        });
+        self
+    }
+
+    fn add_icon_item(
+        mut self,
+        icon_rel: &str,
+        icon_source: &str,
+        icon_sizes: Option<&str>,
+        icon_color: Option<&str>,
+    ) -> Self {
+        let icon_type = match icon_source.rfind('.') {
+            Some(i) => match icon_source[i..].to_owned().to_lowercase().as_str() {
+                ".gif" => Some("image/gif"),
+                ".ico" => Some("image/x-icon"),
+                ".jpg" => Some("image/jpg"),
+                ".png" => Some("image/png"),
+                ".svg" => Some("image/svg+xml"),
+                _ => None,
+            },
+            _ => None,
+        };
+        self.0.push(html! {
+            link
+                rel=(icon_rel)
+                type=[(icon_type)]
+                sizes=[(icon_sizes)]
+                color=[(icon_color)]
+                href=(icon_source);
+        });
+        self
+    }
+
+    // Favicon PREPARE.
+
+    pub(crate) fn render(&self) -> Markup {
+        html! {
+            @for item in &self.0 {
+                (item)
+            }
+        }
+    }
+}
diff --git a/pagetop/src/html/assets/javascript.rs b/pagetop/src/html/assets/javascript.rs
new file mode 100644
index 00000000..76d84673
--- /dev/null
+++ b/pagetop/src/html/assets/javascript.rs
@@ -0,0 +1,111 @@
+use crate::html::assets::AssetsTrait;
+use crate::html::{html, Markup};
+use crate::{concat_string, AutoDefault, Weight};
+
+#[derive(AutoDefault)]
+enum Source {
+    #[default]
+    From(String),
+    Defer(String),
+    Async(String),
+    Inline(String, String),
+    OnLoad(String, String),
+}
+
+#[rustfmt::skip]
+#[derive(AutoDefault)]
+pub struct JavaScript {
+    source : Source,
+    prefix : &'static str,
+    version: &'static str,
+    weight : Weight,
+}
+
+impl AssetsTrait for JavaScript {
+    fn name(&self) -> &String {
+        match &self.source {
+            Source::From(path) => path,
+            Source::Defer(path) => path,
+            Source::Async(path) => path,
+            Source::Inline(name, _) => name,
+            Source::OnLoad(name, _) => name,
+        }
+    }
+
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+
+    fn render(&self) -> Markup {
+        match &self.source {
+            Source::From(path) => html! {
+                script src=(concat_string!(path, self.prefix, self.version)) {};
+            },
+            Source::Defer(path) => html! {
+                script src=(concat_string!(path, self.prefix, self.version)) defer {};
+            },
+            Source::Async(path) => html! {
+                script src=(concat_string!(path, self.prefix, self.version)) async {};
+            },
+            Source::Inline(_, code) => html! {
+                script { (code) };
+            },
+            Source::OnLoad(_, code) => html! { (concat_string!(
+                "document.addEventListener('DOMContentLoaded',function(){",
+                code,
+                "});"
+            )) },
+        }
+    }
+}
+
+impl JavaScript {
+    pub fn from(path: impl Into<String>) -> Self {
+        JavaScript {
+            source: Source::From(path.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn defer(path: impl Into<String>) -> Self {
+        JavaScript {
+            source: Source::Defer(path.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn asynchronous(path: impl Into<String>) -> Self {
+        JavaScript {
+            source: Source::Async(path.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn inline(name: impl Into<String>, script: impl Into<String>) -> Self {
+        JavaScript {
+            source: Source::Inline(name.into(), script.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn on_load(name: impl Into<String>, script: impl Into<String>) -> Self {
+        JavaScript {
+            source: Source::OnLoad(name.into(), script.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn with_version(mut self, version: &'static str) -> Self {
+        (self.prefix, self.version) = if version.is_empty() {
+            ("", "")
+        } else {
+            ("?v=", version)
+        };
+        self
+    }
+
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
+        self
+    }
+}
diff --git a/pagetop/src/html/assets/stylesheet.rs b/pagetop/src/html/assets/stylesheet.rs
new file mode 100644
index 00000000..5dd65a97
--- /dev/null
+++ b/pagetop/src/html/assets/stylesheet.rs
@@ -0,0 +1,95 @@
+use crate::html::assets::AssetsTrait;
+use crate::html::{html, Markup, PreEscaped};
+use crate::{concat_string, AutoDefault, Weight};
+
+#[derive(AutoDefault)]
+enum Source {
+    #[default]
+    From(String),
+    Inline(String, String),
+}
+
+pub enum TargetMedia {
+    Default,
+    Print,
+    Screen,
+    Speech,
+}
+
+#[rustfmt::skip]
+#[derive(AutoDefault)]
+pub struct StyleSheet {
+    source : Source,
+    prefix : &'static str,
+    version: &'static str,
+    media  : Option<&'static str>,
+    weight : Weight,
+}
+
+impl AssetsTrait for StyleSheet {
+    fn name(&self) -> &String {
+        match &self.source {
+            Source::From(path) => path,
+            Source::Inline(name, _) => name,
+        }
+    }
+
+    fn weight(&self) -> Weight {
+        self.weight
+    }
+
+    fn render(&self) -> Markup {
+        match &self.source {
+            Source::From(path) => html! {
+                link
+                    rel="stylesheet"
+                    href=(concat_string!(path, self.prefix, self.version))
+                    media=[self.media];
+            },
+            Source::Inline(_, code) => html! {
+                style { (PreEscaped(code)) };
+            },
+        }
+    }
+}
+
+impl StyleSheet {
+    pub fn from(path: impl Into<String>) -> Self {
+        StyleSheet {
+            source: Source::From(path.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn inline(name: impl Into<String>, styles: impl Into<String>) -> Self {
+        StyleSheet {
+            source: Source::Inline(name.into(), styles.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn with_version(mut self, version: &'static str) -> Self {
+        (self.prefix, self.version) = if version.is_empty() {
+            ("", "")
+        } else {
+            ("?v=", version)
+        };
+        self
+    }
+
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
+        self
+    }
+
+    #[rustfmt::skip]
+    pub fn for_media(mut self, media: &TargetMedia) -> Self {
+        self.media = match media {
+            TargetMedia::Default => None,
+            TargetMedia::Print   => Some("print"),
+            TargetMedia::Screen  => Some("screen"),
+            TargetMedia::Speech  => Some("speech"),
+        };
+        self
+    }
+}
diff --git a/pagetop/src/html/maud.rs b/pagetop/src/html/maud.rs
new file mode 100644
index 00000000..801895e5
--- /dev/null
+++ b/pagetop/src/html/maud.rs
@@ -0,0 +1,350 @@
+//#![no_std]
+
+//! A macro for writing HTML templates.
+//!
+//! This documentation only describes the runtime API. For a general
+//! guide, check out the [book] instead.
+//!
+//! [book]: https://maud.lambda.xyz/
+
+//#![doc(html_root_url = "https://docs.rs/maud/0.25.0")]
+
+extern crate alloc;
+
+use alloc::{borrow::Cow, boxed::Box, string::String};
+use core::fmt::{self, Arguments, Display, Write};
+
+pub use pagetop_macros::html;
+
+mod escape;
+
+/// An adapter that escapes HTML special characters.
+///
+/// The following characters are escaped:
+///
+/// * `&` is escaped as `&amp;`
+/// * `<` is escaped as `&lt;`
+/// * `>` is escaped as `&gt;`
+/// * `"` is escaped as `&quot;`
+///
+/// All other characters are passed through unchanged.
+///
+/// **Note:** In versions prior to 0.13, the single quote (`'`) was
+/// escaped as well.
+///
+/// # Example
+///
+/// ```rust
+/// use maud::Escaper;
+/// use std::fmt::Write;
+/// let mut s = String::new();
+/// write!(Escaper::new(&mut s), "<script>launchMissiles()</script>").unwrap();
+/// assert_eq!(s, "&lt;script&gt;launchMissiles()&lt;/script&gt;");
+/// ```
+pub struct Escaper<'a>(&'a mut String);
+
+impl<'a> Escaper<'a> {
+    /// Creates an `Escaper` from a `String`.
+    pub fn new(buffer: &'a mut String) -> Escaper<'a> {
+        Escaper(buffer)
+    }
+}
+
+impl<'a> fmt::Write for Escaper<'a> {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        escape::escape_to_string(s, self.0);
+        Ok(())
+    }
+}
+
+/// Represents a type that can be rendered as HTML.
+///
+/// To implement this for your own type, override either the `.render()`
+/// or `.render_to()` methods; since each is defined in terms of the
+/// other, you only need to implement one of them. See the example below.
+///
+/// # Minimal implementation
+///
+/// An implementation of this trait must override at least one of
+/// `.render()` or `.render_to()`. Since the default definitions of
+/// these methods call each other, not doing this will result in
+/// infinite recursion.
+///
+/// # Example
+///
+/// ```rust
+/// use maud::{html, Markup, Render};
+///
+/// /// Provides a shorthand for linking to a CSS stylesheet.
+/// pub struct Stylesheet(&'static str);
+///
+/// impl Render for Stylesheet {
+///     fn render(&self) -> Markup {
+///         html! {
+///             link rel="stylesheet" type="text/css" href=(self.0);
+///         }
+///     }
+/// }
+/// ```
+pub trait Render {
+    /// Renders `self` as a block of `Markup`.
+    fn render(&self) -> Markup {
+        let mut buffer = String::new();
+        self.render_to(&mut buffer);
+        PreEscaped(buffer)
+    }
+
+    /// Appends a representation of `self` to the given buffer.
+    ///
+    /// Its default implementation just calls `.render()`, but you may
+    /// override it with something more efficient.
+    ///
+    /// Note that no further escaping is performed on data written to
+    /// the buffer. If you override this method, you must make sure that
+    /// any data written is properly escaped, whether by hand or using
+    /// the [`Escaper`](struct.Escaper.html) wrapper struct.
+    fn render_to(&self, buffer: &mut String) {
+        buffer.push_str(&self.render().into_string());
+    }
+}
+
+impl Render for str {
+    fn render_to(&self, w: &mut String) {
+        escape::escape_to_string(self, w);
+    }
+}
+
+impl Render for String {
+    fn render_to(&self, w: &mut String) {
+        str::render_to(self, w);
+    }
+}
+
+impl<'a> Render for Cow<'a, str> {
+    fn render_to(&self, w: &mut String) {
+        str::render_to(self, w);
+    }
+}
+
+impl<'a> Render for Arguments<'a> {
+    fn render_to(&self, w: &mut String) {
+        let _ = Escaper::new(w).write_fmt(*self);
+    }
+}
+
+impl<'a, T: Render + ?Sized> Render for &'a T {
+    fn render_to(&self, w: &mut String) {
+        T::render_to(self, w);
+    }
+}
+
+impl<'a, T: Render + ?Sized> Render for &'a mut T {
+    fn render_to(&self, w: &mut String) {
+        T::render_to(self, w);
+    }
+}
+
+impl<T: Render + ?Sized> Render for Box<T> {
+    fn render_to(&self, w: &mut String) {
+        T::render_to(self, w);
+    }
+}
+
+macro_rules! impl_render_with_display {
+    ($($ty:ty)*) => {
+        $(
+            impl Render for $ty {
+                fn render_to(&self, w: &mut String) {
+                    // TODO: remove the explicit arg when Rust 1.58 is released
+                    format_args!("{self}", self = self).render_to(w);
+                }
+            }
+        )*
+    };
+}
+
+impl_render_with_display! {
+    char f32 f64
+}
+
+macro_rules! impl_render_with_itoa {
+    ($($ty:ty)*) => {
+        $(
+            impl Render for $ty {
+                fn render_to(&self, w: &mut String) {
+                    w.push_str(itoa::Buffer::new().format(*self));
+                }
+            }
+        )*
+    };
+}
+
+impl_render_with_itoa! {
+    i8 i16 i32 i64 i128 isize
+    u8 u16 u32 u64 u128 usize
+}
+
+/// Renders a value using its [`Display`] impl.
+///
+/// # Example
+///
+/// ```rust
+/// use maud::html;
+/// use std::net::Ipv4Addr;
+///
+/// let ip_address = Ipv4Addr::new(127, 0, 0, 1);
+///
+/// let markup = html! {
+///     "My IP address is: "
+///     (maud::display(ip_address))
+/// };
+///
+/// assert_eq!(markup.into_string(), "My IP address is: 127.0.0.1");
+/// ```
+pub fn display(value: impl Display) -> impl Render {
+    struct DisplayWrapper<T>(T);
+
+    impl<T: Display> Render for DisplayWrapper<T> {
+        fn render_to(&self, w: &mut String) {
+            format_args!("{0}", self.0).render_to(w);
+        }
+    }
+
+    DisplayWrapper(value)
+}
+
+/// A wrapper that renders the inner value without escaping.
+#[derive(Debug, Clone, Copy)]
+pub struct PreEscaped<T: AsRef<str>>(pub T);
+
+impl<T: AsRef<str>> Render for PreEscaped<T> {
+    fn render_to(&self, w: &mut String) {
+        w.push_str(self.0.as_ref());
+    }
+}
+
+/// A block of markup is a string that does not need to be escaped.
+///
+/// The `html!` macro expands to an expression of this type.
+pub type Markup = PreEscaped<String>;
+
+impl Markup {
+    pub fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+}
+
+impl<T: AsRef<str> + Into<String>> PreEscaped<T> {
+    /// Converts the inner value to a string.
+    pub fn into_string(self) -> String {
+        self.0.into()
+    }
+}
+
+impl<T: AsRef<str> + Into<String>> From<PreEscaped<T>> for String {
+    fn from(value: PreEscaped<T>) -> String {
+        value.into_string()
+    }
+}
+
+impl<T: AsRef<str> + Default> Default for PreEscaped<T> {
+    fn default() -> Self {
+        Self(Default::default())
+    }
+}
+
+/// The literal string `<!DOCTYPE html>`.
+///
+/// # Example
+///
+/// A minimal web page:
+///
+/// ```rust
+/// use maud::{DOCTYPE, html};
+///
+/// let markup = html! {
+///     (DOCTYPE)
+///     html {
+///         head {
+///             meta charset="utf-8";
+///             title { "Test page" }
+///         }
+///         body {
+///             p { "Hello, world!" }
+///         }
+///     }
+/// };
+/// ```
+pub const DOCTYPE: PreEscaped<&'static str> = PreEscaped("<!DOCTYPE html>");
+
+mod actix_support {
+    extern crate alloc;
+
+    use crate::html::PreEscaped;
+    use actix_web::{http::header, HttpRequest, HttpResponse, Responder};
+    use alloc::string::String;
+
+    impl Responder for PreEscaped<String> {
+        type Body = String;
+
+        fn respond_to(self, _req: &HttpRequest) -> HttpResponse<Self::Body> {
+            HttpResponse::Ok()
+                .content_type(header::ContentType::html())
+                .message_body(self.0)
+                .unwrap()
+        }
+    }
+}
+
+#[doc(hidden)]
+pub mod html_private {
+    extern crate alloc;
+
+    use super::{display, Render};
+    use alloc::string::String;
+    use core::fmt::Display;
+
+    #[doc(hidden)]
+    #[macro_export]
+    macro_rules! render_to {
+        ($x:expr, $buffer:expr) => {{
+            use $crate::html::html_private::*;
+            match ChooseRenderOrDisplay($x) {
+                x => (&&x).implements_render_or_display().render_to(x.0, $buffer),
+            }
+        }};
+    }
+
+    pub use render_to;
+
+    pub struct ChooseRenderOrDisplay<T>(pub T);
+
+    pub struct ViaRenderTag;
+    pub struct ViaDisplayTag;
+
+    pub trait ViaRender {
+        fn implements_render_or_display(&self) -> ViaRenderTag {
+            ViaRenderTag
+        }
+    }
+    pub trait ViaDisplay {
+        fn implements_render_or_display(&self) -> ViaDisplayTag {
+            ViaDisplayTag
+        }
+    }
+
+    impl<T: Render> ViaRender for &ChooseRenderOrDisplay<T> {}
+    impl<T: Display> ViaDisplay for ChooseRenderOrDisplay<T> {}
+
+    impl ViaRenderTag {
+        pub fn render_to<T: Render + ?Sized>(self, value: &T, buffer: &mut String) {
+            value.render_to(buffer);
+        }
+    }
+
+    impl ViaDisplayTag {
+        pub fn render_to<T: Display + ?Sized>(self, value: &T, buffer: &mut String) {
+            display(value).render_to(buffer);
+        }
+    }
+}
diff --git a/pagetop/src/html/maud/escape.rs b/pagetop/src/html/maud/escape.rs
new file mode 100644
index 00000000..94cdeec1
--- /dev/null
+++ b/pagetop/src/html/maud/escape.rs
@@ -0,0 +1,34 @@
+// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+// !!!!! PLEASE KEEP THIS IN SYNC WITH `maud_macros/src/escape.rs` !!!!!
+// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+extern crate alloc;
+
+use alloc::string::String;
+
+pub fn escape_to_string(input: &str, output: &mut String) {
+    for b in input.bytes() {
+        match b {
+            b'&' => output.push_str("&amp;"),
+            b'<' => output.push_str("&lt;"),
+            b'>' => output.push_str("&gt;"),
+            b'"' => output.push_str("&quot;"),
+            _ => unsafe { output.as_mut_vec().push(b) },
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    extern crate alloc;
+
+    use super::escape_to_string;
+    use alloc::string::String;
+
+    #[test]
+    fn it_works() {
+        let mut s = String::new();
+        escape_to_string("<script>launchMissiles()</script>", &mut s);
+        assert_eq!(s, "&lt;script&gt;launchMissiles()&lt;/script&gt;");
+    }
+}
diff --git a/pagetop/src/html/opt_classes.rs b/pagetop/src/html/opt_classes.rs
new file mode 100644
index 00000000..453991cd
--- /dev/null
+++ b/pagetop/src/html/opt_classes.rs
@@ -0,0 +1,111 @@
+//! **OptionClasses** implements a *helper* for dynamically adding class names to components.
+//!
+//! This *helper* differentiates between default classes (generally associated with styles provided
+//! by the theme) and user classes (for customizing components based on application styles).
+//!
+//! Classes can be added using [Add]. Operations to [Remove], [Replace] or [Toggle] a class, as well
+//! as [Clear] all classes, are also provided.
+//!
+//! **OptionClasses** assumes that the order of the classes is irrelevant
+//! (<https://stackoverflow.com/a/1321712>), and duplicate classes will not be allowed.
+
+use crate::{fn_builder, AutoDefault};
+
+pub enum ClassesOp {
+    Add,
+    Prepend,
+    Remove,
+    Replace(String),
+    Toggle,
+    Set,
+}
+
+#[derive(AutoDefault)]
+pub struct OptionClasses(Vec<String>);
+
+impl OptionClasses {
+    pub fn new(classes: impl Into<String>) -> Self {
+        OptionClasses::default().with_value(ClassesOp::Prepend, classes)
+    }
+
+    // OptionClasses BUILDER.
+
+    #[fn_builder]
+    pub fn set_value(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
+        let classes: String = classes.into();
+        let classes: Vec<&str> = classes.split_ascii_whitespace().collect();
+
+        if classes.is_empty() {
+            return self;
+        }
+
+        match op {
+            ClassesOp::Add => {
+                self.add(&classes, self.0.len());
+            }
+            ClassesOp::Prepend => {
+                self.add(&classes, 0);
+            }
+            ClassesOp::Remove => {
+                for class in classes {
+                    self.0.retain(|c| c.ne(&class.to_string()));
+                }
+            }
+            ClassesOp::Replace(classes_to_replace) => {
+                let mut pos = self.0.len();
+                let replace: Vec<&str> = classes_to_replace.split_ascii_whitespace().collect();
+                for class in replace {
+                    if let Some(replace_pos) = self.0.iter().position(|c| c.eq(class)) {
+                        self.0.remove(replace_pos);
+                        if pos > replace_pos {
+                            pos = replace_pos;
+                        }
+                    }
+                }
+                self.add(&classes, pos);
+            }
+            ClassesOp::Toggle => {
+                for class in classes {
+                    if !class.is_empty() {
+                        if let Some(pos) = self.0.iter().position(|c| c.eq(class)) {
+                            self.0.remove(pos);
+                        } else {
+                            self.0.push(class.to_string());
+                        }
+                    }
+                }
+            }
+            ClassesOp::Set => {
+                self.0.clear();
+                self.add(&classes, 0);
+            }
+        }
+
+        self
+    }
+
+    #[inline]
+    fn add(&mut self, classes: &[&str], mut pos: usize) {
+        for &class in classes {
+            if !class.is_empty() && !self.0.iter().any(|c| c == class) {
+                self.0.insert(pos, class.to_string());
+                pos += 1;
+            }
+        }
+    }
+
+    // OptionClasses GETTERS.
+
+    pub fn get(&self) -> Option<String> {
+        if self.0.is_empty() {
+            None
+        } else {
+            Some(self.0.join(" "))
+        }
+    }
+
+    pub fn contains(&self, class: impl Into<String>) -> bool {
+        let class: String = class.into();
+        self.0.iter().any(|c| c.eq(&class))
+    }
+}
diff --git a/pagetop/src/html/opt_component.rs b/pagetop/src/html/opt_component.rs
new file mode 100644
index 00000000..5082a939
--- /dev/null
+++ b/pagetop/src/html/opt_component.rs
@@ -0,0 +1,46 @@
+use crate::core::component::{ComponentTrait, Context, TypedComponent};
+use crate::fn_builder;
+use crate::html::{html, Markup};
+
+pub struct OptionComponent<C: ComponentTrait>(Option<TypedComponent<C>>);
+
+impl<C: ComponentTrait> Default for OptionComponent<C> {
+    fn default() -> Self {
+        OptionComponent(None)
+    }
+}
+
+impl<C: ComponentTrait> OptionComponent<C> {
+    pub fn new(component: C) -> Self {
+        OptionComponent::default().with_value(Some(component))
+    }
+
+    // OptionComponent BUILDER.
+
+    #[fn_builder]
+    pub fn set_value(&mut self, component: Option<C>) -> &mut Self {
+        if let Some(component) = component {
+            self.0 = Some(TypedComponent::with(component));
+        } else {
+            self.0 = None;
+        }
+        self
+    }
+
+    // OptionComponent GETTERS.
+
+    pub fn get(&self) -> Option<TypedComponent<C>> {
+        if let Some(value) = &self.0 {
+            return Some(value.clone());
+        }
+        None
+    }
+
+    pub fn render(&self, cx: &mut Context) -> Markup {
+        if let Some(component) = &self.0 {
+            component.render(cx)
+        } else {
+            html! {}
+        }
+    }
+}
diff --git a/pagetop/src/html/opt_id.rs b/pagetop/src/html/opt_id.rs
new file mode 100644
index 00000000..80e98325
--- /dev/null
+++ b/pagetop/src/html/opt_id.rs
@@ -0,0 +1,29 @@
+use crate::{fn_builder, AutoDefault};
+
+#[derive(AutoDefault)]
+pub struct OptionId(Option<String>);
+
+impl OptionId {
+    pub fn new(value: impl Into<String>) -> Self {
+        OptionId::default().with_value(value)
+    }
+
+    // OptionId BUILDER.
+
+    #[fn_builder]
+    pub fn set_value(&mut self, value: impl Into<String>) -> &mut Self {
+        self.0 = Some(value.into().trim().replace(' ', "_"));
+        self
+    }
+
+    // OptionId GETTERS.
+
+    pub fn get(&self) -> Option<String> {
+        if let Some(value) = &self.0 {
+            if !value.is_empty() {
+                return Some(value.to_owned());
+            }
+        }
+        None
+    }
+}
diff --git a/pagetop/src/html/opt_name.rs b/pagetop/src/html/opt_name.rs
new file mode 100644
index 00000000..5ba0c486
--- /dev/null
+++ b/pagetop/src/html/opt_name.rs
@@ -0,0 +1,29 @@
+use crate::{fn_builder, AutoDefault};
+
+#[derive(AutoDefault)]
+pub struct OptionName(Option<String>);
+
+impl OptionName {
+    pub fn new(value: impl Into<String>) -> Self {
+        OptionName::default().with_value(value)
+    }
+
+    // OptionName BUILDER.
+
+    #[fn_builder]
+    pub fn set_value(&mut self, value: impl Into<String>) -> &mut Self {
+        self.0 = Some(value.into().trim().replace(' ', "_"));
+        self
+    }
+
+    // OptionName GETTERS.
+
+    pub fn get(&self) -> Option<String> {
+        if let Some(value) = &self.0 {
+            if !value.is_empty() {
+                return Some(value.to_owned());
+            }
+        }
+        None
+    }
+}
diff --git a/pagetop/src/html/opt_string.rs b/pagetop/src/html/opt_string.rs
new file mode 100644
index 00000000..7de22486
--- /dev/null
+++ b/pagetop/src/html/opt_string.rs
@@ -0,0 +1,29 @@
+use crate::{fn_builder, AutoDefault};
+
+#[derive(AutoDefault)]
+pub struct OptionString(Option<String>);
+
+impl OptionString {
+    pub fn new(value: impl Into<String>) -> Self {
+        OptionString::default().with_value(value)
+    }
+
+    // OptionString BUILDER.
+
+    #[fn_builder]
+    pub fn set_value(&mut self, value: impl Into<String>) -> &mut Self {
+        self.0 = Some(value.into().trim().to_owned());
+        self
+    }
+
+    // OptionString GETTERS.
+
+    pub fn get(&self) -> Option<String> {
+        if let Some(value) = &self.0 {
+            if !value.is_empty() {
+                return Some(value.to_owned());
+            }
+        }
+        None
+    }
+}
diff --git a/pagetop/src/html/opt_translated.rs b/pagetop/src/html/opt_translated.rs
new file mode 100644
index 00000000..e50a073f
--- /dev/null
+++ b/pagetop/src/html/opt_translated.rs
@@ -0,0 +1,30 @@
+use crate::html::Markup;
+use crate::locale::{L10n, LanguageIdentifier};
+use crate::{fn_builder, AutoDefault};
+
+#[derive(AutoDefault)]
+pub struct OptionTranslated(L10n);
+
+impl OptionTranslated {
+    pub fn new(value: L10n) -> Self {
+        OptionTranslated(value)
+    }
+
+    // OptionTranslated BUILDER.
+
+    #[fn_builder]
+    pub fn set_value(&mut self, value: L10n) -> &mut Self {
+        self.0 = value;
+        self
+    }
+
+    // OptionTranslated GETTERS.
+
+    pub fn using(&self, langid: &LanguageIdentifier) -> Option<String> {
+        self.0.using(langid)
+    }
+
+    pub fn escaped(&self, langid: &LanguageIdentifier) -> Markup {
+        self.0.escaped(langid)
+    }
+}
diff --git a/pagetop/src/html/unit.rs b/pagetop/src/html/unit.rs
new file mode 100644
index 00000000..5a153c55
--- /dev/null
+++ b/pagetop/src/html/unit.rs
@@ -0,0 +1,56 @@
+use crate::AutoDefault;
+
+use std::fmt;
+
+// About pixels: Pixels (px) are relative to the viewing device. For low-dpi devices, 1px is one
+// device pixel (dot) of the display. For printers and high resolution screens 1px implies multiple
+// device pixels.
+
+// About em: 2em means 2 times the size of the current font. The em and rem units are practical in
+// creating perfectly scalable layout!
+
+// About viewport: If the browser window size is 50cm wide, 1vw = 0.5cm.
+
+#[rustfmt::skip]
+#[derive(AutoDefault)]
+pub enum Value {
+    #[default]
+    None,
+    Auto,
+
+    Cm(isize),      // Centimeters.
+    In(isize),      // Inches (1in = 96px = 2.54cm).
+    Mm(isize),      // Millimeters.
+    Pc(isize),      // Picas (1pc = 12pt).
+    Pt(isize),      // Points (1pt = 1/72 of 1in).
+    Px(isize),      // Pixels (1px = 1/96th of 1in).
+
+    RelEm(f32),     // Relative to the font-size of the element.
+    RelPct(f32),    // Percentage relative to the parent element.
+    RelRem(f32),    // Relative to font-size of the root element.
+    RelVh(f32),     // Relative to 1% of the height of the viewport.
+    RelVw(f32),     // Relative to 1% of the value of the viewport.
+}
+
+#[rustfmt::skip]
+impl fmt::Display for Value {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Value::None       => write!(f, ""),
+            Value::Auto       => write!(f, "auto"),
+            // Absolute value.
+            Value::Cm(av)     => write!(f, "{av}cm"),
+            Value::In(av)     => write!(f, "{av}in"),
+            Value::Mm(av)     => write!(f, "{av}mm"),
+            Value::Pc(av)     => write!(f, "{av}pc"),
+            Value::Pt(av)     => write!(f, "{av}pt"),
+            Value::Px(av)     => write!(f, "{av}px"),
+            // Relative value.
+            Value::RelEm(rv)  => write!(f, "{rv}em"),
+            Value::RelPct(rv) => write!(f, "{rv}%"),
+            Value::RelRem(rv) => write!(f, "{rv}rem"),
+            Value::RelVh(rv)  => write!(f, "{rv}vh"),
+            Value::RelVw(rv)  => write!(f, "{rv}vw"),
+        }
+    }
+}
diff --git a/pagetop/src/lib.rs b/pagetop/src/lib.rs
new file mode 100644
index 00000000..a5369718
--- /dev/null
+++ b/pagetop/src/lib.rs
@@ -0,0 +1,119 @@
+//! <div align="center">
+//!
+//! <img src="https://raw.githubusercontent.com/manuelcillero/pagetop/main/static/banner.png" />
+//!
+//! <h1>PageTop</h1>
+//!
+//! <p>An opinionated web framework to build modular <em>Server-Side Rendering</em> web solutions.</p>
+//!
+//! [![License](https://img.shields.io/badge/license-MIT%2FApache-blue.svg?style=for-the-badge)](https://github.com/manuelcillero/pagetop#-license)
+//! [![API Docs](https://img.shields.io/docsrs/pagetop?label=API%20Docs&style=for-the-badge&logo=Docs.rs)](https://docs.rs/pagetop)
+//! [![Crates.io](https://img.shields.io/crates/v/pagetop.svg?style=for-the-badge&logo=ipfs)](https://crates.io/crates/pagetop)
+//! [![Downloads](https://img.shields.io/crates/d/pagetop.svg?style=for-the-badge&logo=transmission)](https://crates.io/crates/pagetop)
+//!
+//! <br>
+//! </div>
+//!
+//! The `PageTop` core API provides a comprehensive toolkit for extending its functionalities to
+//! specific requirements and application scenarios through actions, components, packages, and
+//! themes:
+//!
+//!   * **Actions** serve as a mechanism to customize `PageTop`'s internal behavior by intercepting
+//!     its execution flow.
+//!   * **Components** encapsulate HTML, CSS, and JavaScript into functional, configurable, and
+//!     well-defined units.
+//!   * **Packages** extend or customize existing functionality by interacting with `PageTop` APIs
+//!     or third-party package APIs.
+//!   * **Themes** enable developers to alter the appearance of pages and components without
+//!     affecting their functionality.
+//!
+//! # ⚡️ Quick start
+//!
+//! ```rust
+//! use pagetop::prelude::*;
+//!
+//! struct HelloWorld;
+//!
+//! impl PackageTrait for HelloWorld {
+//!     fn configure_service(&self, scfg: &mut service::web::ServiceConfig) {
+//!         scfg.route("/", service::web::get().to(hello_world));
+//!     }
+//! }
+//!
+//! async fn hello_world(request: HttpRequest) -> ResultPage<Markup, ErrorPage> {
+//!     Page::new(request)
+//!         .with_component(Html::with(html! { h1 { "Hello World!" } }))
+//!         .render()
+//! }
+//!
+//! #[pagetop::main]
+//! async fn main() -> std::io::Result<()> {
+//!     Application::prepare(&HelloWorld).run()?.await
+//! }
+//! ```
+//! This program implements a package named `HelloWorld` with one service that returns a web page
+//! that greets the world whenever it is accessed from the browser at `http://localhost:8088` (using
+//! the [default configuration settings](`global::Server`)). You can find this code in the `PageTop`
+//! [examples repository](https://github.com/manuelcillero/pagetop/tree/latest/examples).
+//!
+//! # 🧩 Dependency Management
+//!
+//! Projects leveraging `PageTop` will use `cargo` to resolve dependencies, similar to any other
+//! Rust project.
+//!
+//! Nevertheless, it’s crucial that each package explicitly declares its
+//! [dependencies](core::package::PackageTrait#method.dependencies), if any, to assist `PageTop` in
+//! structuring and initializing the application in a modular fashion.
+//!
+//! # 🚧 Warning
+//!
+//! **`PageTop`** framework is currently in active development. The API is unstable and subject to
+//! frequent changes. Production use is not recommended until version **0.1.0**.
+
+#![cfg_attr(docsrs, feature(doc_cfg))]
+
+// RE-EXPORTED *************************************************************************************
+
+pub use concat_string::concat_string;
+
+/// Enables flexible identifier concatenation in macros, allowing new items with pasted identifiers.
+pub use paste::paste;
+
+pub use pagetop_macros::{fn_builder, html, main, test, AutoDefault, ComponentClasses};
+
+pub type StaticResources = std::collections::HashMap<&'static str, static_files::Resource>;
+
+pub use std::any::TypeId;
+
+pub type Weight = i8;
+
+// API *********************************************************************************************
+
+// Useful functions and macros.
+pub mod util;
+// Load configuration settings.
+pub mod config;
+// Global settings.
+pub mod global;
+// Application tracing and event logging.
+pub mod trace;
+// HTML in code.
+pub mod html;
+// Localization.
+pub mod locale;
+// Date and time handling.
+pub mod datetime;
+// Essential web framework.
+pub mod service;
+// Key types and functions for creating actions, components, packages, and themes.
+pub mod core;
+// Web request response variants.
+pub mod response;
+// Base actions, components, packages, and themes.
+pub mod base;
+// Prepare and run the application.
+pub mod app;
+
+// The PageTop Prelude *****************************************************************************
+
+pub mod prelude;
diff --git a/pagetop/src/locale.rs b/pagetop/src/locale.rs
new file mode 100644
index 00000000..6cc79c9f
--- /dev/null
+++ b/pagetop/src/locale.rs
@@ -0,0 +1,281 @@
+//! Localization (L10n).
+//!
+//! PageTop uses the [Fluent](https://www.projectfluent.org/) specifications for application
+//! localization, leveraging the [fluent-templates](https://docs.rs/fluent-templates/) crate to
+//! integrate translation resources directly into the application binary.
+//!
+//! # Fluent Syntax (FTL)
+//!
+//! The format used to describe the translation resources used by Fluent is called
+//! [FTL](https://www.projectfluent.org/fluent/guide/). FTL is designed to be both readable and
+//! expressive, enabling complex natural language constructs like gender, plurals, and conjugations.
+//!
+//! # Fluent Resources
+//!
+//! Localization resources are organized in the *src/locale* directory, with subdirectories for
+//! each valid [Unicode Language Identifier](https://docs.rs/unic-langid/):
+//!
+//! ```text
+//! src/locale/
+//!      ├── common.ftl
+//!      ├── en-US/
+//!      │   ├── default.ftl
+//!      │   └── main.ftl
+//!      ├── es-ES/
+//!      │   ├── default.ftl
+//!      │   └── main.ftl
+//!      ├── es-MX/
+//!      │   ├── default.ftl
+//!      │   └── main.ftl
+//!      └── fr/
+//!          ├── default.ftl
+//!          └── main.ftl
+//! ```
+//!
+//! Example of a file *src/locale/en-US/main.ftl*:
+//!
+//! ```text
+//! hello-world = Hello world!
+//! hello-user = Hello, {$userName}!
+//! shared-photos =
+//!     {$userName} {$photoCount ->
+//!         [one] added a new photo
+//!        *[other] added {$photoCount} new photos
+//!     } of {$userGender ->
+//!         [male] him and his family
+//!         [female] her and her family
+//!        *[other] the family
+//!     }.
+//! ```
+//!
+//! Example of the equivalent file *src/locale/es-ES/main.ftl*:
+//!
+//! ```text
+//! hello-world = Hola mundo!
+//! hello-user = ¡Hola, {$userName}!
+//! shared-photos =
+//!     {$userName} {$photoCount ->
+//!         [one] ha añadido una nueva foto
+//!        *[other] ha añadido {$photoCount} nuevas fotos
+//!     } de {$userGender ->
+//!         [male] él y su familia
+//!         [female] ella y su familia
+//!        *[other] la familia
+//!     }.
+//! ```
+//!
+//! # How to apply localization in your code
+//!
+//! Once you have created your FTL resource directory, use the
+//! [`include_locales!`](crate::include_locales) macro to integrate them into your module or
+//! application. If your resources are located in the `"src/locale"` directory, simply declare:
+//!
+//! ```
+//! use pagetop::prelude::*;
+//!
+//! include_locales!(LOCALES_SAMPLE);
+//! ```
+//!
+//! But if they are in another directory, then you can use:
+//!
+//! ```
+//! use pagetop::prelude::*;
+//!
+//! include_locales!(LOCALES_SAMPLE from "path/to/locale");
+//! ```
+
+use crate::html::{Markup, PreEscaped};
+use crate::{global, kv, AutoDefault};
+
+pub use fluent_templates;
+pub use unic_langid::{CharacterDirection, LanguageIdentifier};
+
+use fluent_templates::Loader;
+use fluent_templates::StaticLoader as Locales;
+
+use unic_langid::langid;
+
+use std::collections::HashMap;
+use std::sync::LazyLock;
+
+use std::fmt;
+
+/// A mapping between language codes (e.g., "en-US") and their corresponding [`LanguageIdentifier`]
+/// and locale key names.
+static LANGUAGES: LazyLock<HashMap<String, (LanguageIdentifier, &str)>> = LazyLock::new(|| {
+    kv![
+        "en"    => ( langid!("en-US"), "english" ),
+        "en-GB" => ( langid!("en-GB"), "english_british" ),
+        "en-US" => ( langid!("en-US"), "english_united_states" ),
+        "es"    => ( langid!("es-ES"), "spanish" ),
+        "es-ES" => ( langid!("es-ES"), "spanish_spain" ),
+    ]
+});
+
+pub static FALLBACK_LANGID: LazyLock<LanguageIdentifier> = LazyLock::new(|| langid!("en-US"));
+
+/// Sets the application's default
+/// [Unicode Language Identifier](https://unicode.org/reports/tr35/tr35.html#Unicode_language_identifier)
+/// through `SETTINGS.app.language`.
+pub static DEFAULT_LANGID: LazyLock<&LanguageIdentifier> =
+    LazyLock::new(|| langid_for(&global::SETTINGS.app.language).unwrap_or(&FALLBACK_LANGID));
+
+pub enum LangError {
+    EmptyLang,
+    UnknownLang(String),
+}
+
+impl fmt::Display for LangError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            LangError::EmptyLang => write!(f, "The language identifier is empty."),
+            LangError::UnknownLang(lang) => write!(f, "Unknown language identifier: {lang}"),
+        }
+    }
+}
+
+pub fn langid_for(language: impl Into<String>) -> Result<&'static LanguageIdentifier, LangError> {
+    let language = language.into();
+    if language.is_empty() {
+        return Err(LangError::EmptyLang);
+    }
+    // Attempt to match the full language code (e.g., "es-MX").
+    if let Some(langid) = LANGUAGES.get(&language).map(|(langid, _)| langid) {
+        return Ok(langid);
+    }
+    // Fallback to the base language if no sublocale is found (e.g., "es").
+    if let Some((base_lang, _)) = language.split_once('-') {
+        if let Some(langid) = LANGUAGES.get(base_lang).map(|(langid, _)| langid) {
+            return Ok(langid);
+        }
+    }
+    Err(LangError::UnknownLang(language))
+}
+
+#[macro_export]
+/// Defines a set of localization elements and local translation texts, removing Unicode isolating
+/// marks around arguments to improve readability and compatibility in certain rendering contexts.
+macro_rules! include_locales {
+    ( $LOCALES:ident $(, $core_locales:literal)? ) => {
+        $crate::locale::fluent_templates::static_loader! {
+            static $LOCALES = {
+                locales: "src/locale",
+                $( core_locales: $core_locales, )?
+                fallback_language: "en-US",
+                // Removes unicode isolating marks around arguments.
+                customise: |bundle| bundle.set_use_isolating(false),
+            };
+        }
+    };
+    ( $LOCALES:ident from $dir_locales:literal $(, $core_locales:literal)? ) => {
+        $crate::locale::fluent_templates::static_loader! {
+            static $LOCALES = {
+                locales: $dir_locales,
+                $( core_locales: $core_locales, )?
+                fallback_language: "en-US",
+                // Removes unicode isolating marks around arguments.
+                customise: |bundle| bundle.set_use_isolating(false),
+            };
+        }
+    };
+}
+
+include_locales!(LOCALES_PAGETOP);
+
+#[derive(AutoDefault)]
+enum L10nOp {
+    #[default]
+    None,
+    Text(String),
+    Translate(String),
+}
+
+#[derive(AutoDefault)]
+pub struct L10n {
+    op: L10nOp,
+    #[default(&LOCALES_PAGETOP)]
+    locales: &'static Locales,
+    args: HashMap<String, String>,
+}
+
+impl L10n {
+    pub fn n(text: impl Into<String>) -> Self {
+        L10n {
+            op: L10nOp::Text(text.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn l(key: impl Into<String>) -> Self {
+        L10n {
+            op: L10nOp::Translate(key.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn t(key: impl Into<String>, locales: &'static Locales) -> Self {
+        L10n {
+            op: L10nOp::Translate(key.into()),
+            locales,
+            ..Default::default()
+        }
+    }
+
+    pub fn with_arg(mut self, arg: impl Into<String>, value: impl Into<String>) -> Self {
+        self.args.insert(arg.into(), value.into());
+        self
+    }
+
+    pub fn with_args(mut self, args: HashMap<String, String>) -> Self {
+        for (k, v) in args {
+            self.args.insert(k, v);
+        }
+        self
+    }
+
+    pub fn get(&self) -> Option<String> {
+        self.using(&DEFAULT_LANGID)
+    }
+
+    pub fn using(&self, langid: &LanguageIdentifier) -> Option<String> {
+        match &self.op {
+            L10nOp::None => None,
+            L10nOp::Text(text) => Some(text.to_owned()),
+            L10nOp::Translate(key) => {
+                if self.args.is_empty() {
+                    self.locales.try_lookup(langid, key)
+                } else {
+                    self.locales.try_lookup_with_args(
+                        langid,
+                        key,
+                        &self.args.iter().fold(HashMap::new(), |mut args, (k, v)| {
+                            args.insert(k.to_string(), v.to_owned().into());
+                            args
+                        }),
+                    )
+                }
+            }
+        }
+    }
+
+    /// Escapes translated text using the default language identifier.
+    pub fn markup(&self) -> Markup {
+        PreEscaped(self.get().unwrap_or_default())
+    }
+
+    /// Escapes translated text using the specified language identifier.
+    pub fn escaped(&self, langid: &LanguageIdentifier) -> Markup {
+        PreEscaped(self.using(langid).unwrap_or_default())
+    }
+}
+
+impl fmt::Display for L10n {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let content = match &self.op {
+            L10nOp::None => "".to_string(),
+            L10nOp::Text(text) => text.clone(),
+            L10nOp::Translate(key) => self.get().unwrap_or_else(|| format!("No <{}>", key)),
+        };
+        write!(f, "{content}")
+    }
+}
diff --git a/pagetop/src/locale/en-US/languages.ftl b/pagetop/src/locale/en-US/languages.ftl
new file mode 100644
index 00000000..1e816605
--- /dev/null
+++ b/pagetop/src/locale/en-US/languages.ftl
@@ -0,0 +1,5 @@
+english = English
+english_british = English (British)
+english_united_states = English (United States)
+spanish = Spanish
+spanish_spain = Spanish (Spain)
diff --git a/pagetop/src/locale/en-US/theme.ftl b/pagetop/src/locale/en-US/theme.ftl
new file mode 100644
index 00000000..fd7f228d
--- /dev/null
+++ b/pagetop/src/locale/en-US/theme.ftl
@@ -0,0 +1 @@
+content = Content
diff --git a/pagetop/src/locale/en-US/welcome.ftl b/pagetop/src/locale/en-US/welcome.ftl
new file mode 100644
index 00000000..fe45c852
--- /dev/null
+++ b/pagetop/src/locale/en-US/welcome.ftl
@@ -0,0 +1,23 @@
+welcome_package_name = Default homepage
+welcome_package_description = Displays a landing page when none is configured.
+
+welcome_title = Hello world!
+
+welcome_intro = Verifying the installation of { $app }.
+welcome_powered = A web solution powered by { $pagetop }.
+
+welcome_page = Welcome Page
+welcome_subtitle = Are you a { $app } user?
+welcome_text1 = If you don't know what this page is about, this probably means that the site is either experiencing problems or is undergoing routine maintenance.
+welcome_text2 = If the issue persists, please contact your system administrator for assistance.
+
+welcome_pagetop_title = About PageTop
+welcome_pagetop_text1 = If you can read this page, it means that the <strong>PageTop</strong> server is working properly, but has not yet been configured.
+welcome_pagetop_text2 = <strong>PageTop</strong> is a <a href="https://www.rust-lang.org" target="_blank">Rust</a>-based web development framework designed to create modular, extensible, and configurable web solutions.
+welcome_pagetop_text3 = For detailed information, please visit the <a href="https://docs.rs/pagetop/latest/pagetop" target="_blank">official technical documentation</a>.
+
+welcome_issues_title = Reporting Issues
+welcome_issues_text1 = To report any issues with <strong>PageTop</strong>, please use <a href="https://github.com/manuelcillero/pagetop/issues" target="_blank">GitHub</a>. However, check the existing error reports to avoid duplicates.
+welcome_issues_text2 = For issues specific to <strong>{ $app }</strong>, please refer to its official repository or support channel, rather than directly to <strong>PageTop</strong>.
+
+welcome_have_fun = Coding is creating
diff --git a/pagetop/src/locale/es-ES/languages.ftl b/pagetop/src/locale/es-ES/languages.ftl
new file mode 100644
index 00000000..ee74ec26
--- /dev/null
+++ b/pagetop/src/locale/es-ES/languages.ftl
@@ -0,0 +1,5 @@
+english = Inglés
+english_british = Inglés (Gran Bretaña)
+english_united_states = Inglés (Estados Unidos)
+spanish = Español
+spanish_spain = Español (España)
diff --git a/pagetop/src/locale/es-ES/theme.ftl b/pagetop/src/locale/es-ES/theme.ftl
new file mode 100644
index 00000000..c2026c6f
--- /dev/null
+++ b/pagetop/src/locale/es-ES/theme.ftl
@@ -0,0 +1 @@
+content = Contenido
diff --git a/pagetop/src/locale/es-ES/welcome.ftl b/pagetop/src/locale/es-ES/welcome.ftl
new file mode 100644
index 00000000..82dad6f0
--- /dev/null
+++ b/pagetop/src/locale/es-ES/welcome.ftl
@@ -0,0 +1,23 @@
+welcome_package_name = Página de inicio predeterminada
+welcome_package_description = Muestra una página de inicio predeterminada cuando no hay ninguna configurada.
+
+welcome_title = ¡Hola mundo!
+
+welcome_intro = Verificando la instalación de { $app }.
+welcome_powered = Una solución web creada con { $pagetop }.
+
+welcome_page = Página de Bienvenida
+welcome_subtitle = ¿Eres usuario de { $app }?
+welcome_text1 = Si no sabes por qué se muestra esta página probablemente significa que el sitio está experimentando problemas o está pasando por un mantenimiento de rutina.
+welcome_text2 = Si el problema persiste, por favor póngase en contacto con el administrador del sistema.
+
+welcome_pagetop_title = Sobre PageTop
+welcome_pagetop_text1 = Si puedes leer esta página significa que el servidor <strong>PageTop</strong> funciona correctamente, pero aún no se ha configurado.
+welcome_pagetop_text2 = <strong>PageTop</strong> es un entorno de desarrollo web basado en <a href="https://www.rust-lang.org/es" target="_blank">Rust</a>, diseñado para crear soluciones web modulares, extensibles y configurables.
+welcome_pagetop_text3 = Para más información visita la <a href="https://docs.rs/pagetop/latest/pagetop" target="_blank">documentación técnica oficial</a>.
+
+welcome_issues_title = Informando Problemas
+welcome_issues_text1 = Para comunicar cualquier problema con <strong>PageTop</strong> utiliza <a href="https://github.com/manuelcillero/pagetop/issues" target="_blank">GitHub</a>. No obstante, comprueba los informes de errores ya existentes para evitar duplicados.
+welcome_issues_text2 = Si son fallos específicos de <strong>{ $app }</strong>, por favor acude a su repositorio oficial o canal de soporte, y no al de <strong>PageTop</strong> directamente.
+
+welcome_have_fun = Programar es crear
diff --git a/pagetop/src/prelude.rs b/pagetop/src/prelude.rs
new file mode 100644
index 00000000..9d0d465f
--- /dev/null
+++ b/pagetop/src/prelude.rs
@@ -0,0 +1,52 @@
+//! The `PageTop` Prelude.
+
+// RE-EXPORTED.
+
+pub use crate::{concat_string, fn_builder, html, main, paste, test};
+
+pub use crate::{AutoDefault, ComponentClasses, StaticResources, TypeId, Weight};
+
+// MACROS.
+
+// crate::util
+pub use crate::kv;
+// crate::config
+pub use crate::include_config;
+// crate::locale
+pub use crate::include_locales;
+// crate::service
+pub use crate::{include_files, include_files_service};
+// crate::core::action
+pub use crate::actions;
+
+// API.
+
+pub use crate::util;
+
+pub use crate::global;
+
+pub use crate::trace;
+
+pub use crate::html::*;
+
+pub use crate::locale::*;
+
+pub use crate::datetime::*;
+
+pub use crate::service;
+pub use crate::service::{HttpMessage, HttpRequest};
+
+pub use crate::core::{AnyBase, AnyTo};
+
+pub use crate::core::action::*;
+pub use crate::core::component::*;
+pub use crate::core::package::*;
+pub use crate::core::theme::*;
+
+pub use crate::response::{json::*, page::*, redirect::*, ResponseError};
+
+pub use crate::base::action;
+pub use crate::base::component::*;
+pub use crate::base::theme;
+
+pub use crate::app::Application;
diff --git a/pagetop/src/response.rs b/pagetop/src/response.rs
new file mode 100644
index 00000000..e51974b1
--- /dev/null
+++ b/pagetop/src/response.rs
@@ -0,0 +1,9 @@
+//! Web request response variants.
+
+pub use actix_web::ResponseError;
+
+pub mod page;
+
+pub mod json;
+
+pub mod redirect;
diff --git a/pagetop/src/response/json.rs b/pagetop/src/response/json.rs
new file mode 100644
index 00000000..684d2c7b
--- /dev/null
+++ b/pagetop/src/response/json.rs
@@ -0,0 +1 @@
+pub use actix_web::web::Json;
diff --git a/pagetop/src/response/page.rs b/pagetop/src/response/page.rs
new file mode 100644
index 00000000..340bd0c7
--- /dev/null
+++ b/pagetop/src/response/page.rs
@@ -0,0 +1,192 @@
+mod error;
+pub use error::ErrorPage;
+
+pub use actix_web::Result as ResultPage;
+
+use crate::base::action;
+use crate::core::component::{AssetsOp, Context};
+use crate::core::component::{ChildComponent, ChildOp, ComponentTrait};
+use crate::fn_builder;
+use crate::html::{html, Markup, DOCTYPE};
+use crate::html::{ClassesOp, OptionClasses, OptionId, OptionTranslated};
+use crate::locale::L10n;
+use crate::service::HttpRequest;
+
+use unic_langid::CharacterDirection;
+
+#[rustfmt::skip]
+pub struct Page {
+    title       : OptionTranslated,
+    description : OptionTranslated,
+    metadata    : Vec<(&'static str, &'static str)>,
+    properties  : Vec<(&'static str, &'static str)>,
+    context     : Context,
+    body_id     : OptionId,
+    body_classes: OptionClasses,
+    body_skip_to: OptionId,
+}
+
+impl Page {
+    #[rustfmt::skip]
+    pub fn new(request: HttpRequest) -> Self {
+        Page {
+            title       : OptionTranslated::default(),
+            description : OptionTranslated::default(),
+            metadata    : Vec::default(),
+            properties  : Vec::default(),
+            context     : Context::new(request),
+            body_id     : OptionId::default(),
+            body_classes: OptionClasses::default(),
+            body_skip_to: OptionId::default(),
+        }
+    }
+
+    // Page BUILDER.
+
+    #[fn_builder]
+    pub fn set_title(&mut self, title: L10n) -> &mut Self {
+        self.title.set_value(title);
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_description(&mut self, description: L10n) -> &mut Self {
+        self.description.set_value(description);
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_metadata(&mut self, name: &'static str, content: &'static str) -> &mut Self {
+        self.metadata.push((name, content));
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_property(&mut self, property: &'static str, content: &'static str) -> &mut Self {
+        self.metadata.push((property, content));
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_assets(&mut self, op: AssetsOp) -> &mut Self {
+        self.context.set_assets(op);
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_body_id(&mut self, id: impl Into<String>) -> &mut Self {
+        self.body_id.set_value(id);
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_body_classes(&mut self, op: ClassesOp, classes: impl Into<String>) -> &mut Self {
+        self.body_classes.set_value(op, classes);
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_body_skip_to(&mut self, id: impl Into<String>) -> &mut Self {
+        self.body_skip_to.set_value(id);
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_layout(&mut self, layout: &'static str) -> &mut Self {
+        self.context.set_assets(AssetsOp::Layout(layout));
+        self
+    }
+
+    #[fn_builder]
+    pub fn set_in_region(&mut self, region: &'static str, op: ChildOp) -> &mut Self {
+        self.context.set_in_region(region, op);
+        self
+    }
+
+    pub fn with_component(mut self, component: impl ComponentTrait) -> Self {
+        self.context
+            .set_in_region("content", ChildOp::Add(ChildComponent::with(component)));
+        self
+    }
+
+    pub fn with_component_in(
+        mut self,
+        region: &'static str,
+        component: impl ComponentTrait,
+    ) -> Self {
+        self.context
+            .set_in_region(region, ChildOp::Add(ChildComponent::with(component)));
+        self
+    }
+
+    // Page GETTERS.
+
+    pub fn title(&mut self) -> Option<String> {
+        self.title.using(self.context.langid())
+    }
+
+    pub fn description(&mut self) -> Option<String> {
+        self.description.using(self.context.langid())
+    }
+
+    pub fn metadata(&self) -> &Vec<(&str, &str)> {
+        &self.metadata
+    }
+
+    pub fn properties(&self) -> &Vec<(&str, &str)> {
+        &self.properties
+    }
+
+    pub fn context(&mut self) -> &mut Context {
+        &mut self.context
+    }
+
+    pub fn body_id(&self) -> &OptionId {
+        &self.body_id
+    }
+
+    pub fn body_classes(&self) -> &OptionClasses {
+        &self.body_classes
+    }
+
+    pub fn body_skip_to(&self) -> &OptionId {
+        &self.body_skip_to
+    }
+
+    // Page RENDER.
+
+    pub fn render(&mut self) -> ResultPage<Markup, ErrorPage> {
+        // Theme-specific operations before rendering the page body.
+        self.context.theme().before_render_body(self);
+
+        // Execute package actions before rendering the page body.
+        action::page::BeforeRenderBody::dispatch(self);
+
+        // Render the page body.
+        let body = self.context.theme().render_body(self);
+
+        // Theme-specific operations after rendering the page body.
+        self.context.theme().after_render_body(self);
+
+        // Execute package actions after rendering the page body.
+        action::page::AfterRenderBody::dispatch(self);
+
+        // Render the page head.
+        let head = self.context.theme().render_head(self);
+
+        // Render the full page with language and direction attributes.
+        let lang = &self.context.langid().language;
+        let dir = match self.context.langid().character_direction() {
+            CharacterDirection::LTR => "ltr",
+            CharacterDirection::RTL => "rtl",
+            CharacterDirection::TTB => "auto",
+        };
+        Ok(html! {
+            (DOCTYPE)
+            html lang=(lang) dir=(dir) {
+                (head)
+                (body)
+            }
+        })
+    }
+}
diff --git a/pagetop/src/response/page/error.rs b/pagetop/src/response/page/error.rs
new file mode 100644
index 00000000..8493d58f
--- /dev/null
+++ b/pagetop/src/response/page/error.rs
@@ -0,0 +1,86 @@
+use crate::base::component::{Error403, Error404};
+use crate::locale::L10n;
+use crate::response::ResponseError;
+use crate::service::http::{header::ContentType, StatusCode};
+use crate::service::{HttpRequest, HttpResponse};
+
+use super::Page;
+
+use std::fmt;
+
+#[derive(Debug)]
+pub enum ErrorPage {
+    NotModified(HttpRequest),
+    BadRequest(HttpRequest),
+    AccessDenied(HttpRequest),
+    NotFound(HttpRequest),
+    PreconditionFailed(HttpRequest),
+    InternalError(HttpRequest),
+    Timeout(HttpRequest),
+}
+
+impl fmt::Display for ErrorPage {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            // Error 304.
+            ErrorPage::NotModified(_) => write!(f, "Not Modified"),
+            // Error 400.
+            ErrorPage::BadRequest(_) => write!(f, "Bad Client Data"),
+            // Error 403.
+            ErrorPage::AccessDenied(request) => {
+                let error_page = Page::new(request.clone());
+                if let Ok(page) = error_page
+                    .with_title(L10n::n("Error FORBIDDEN"))
+                    .with_layout("error")
+                    .with_component(Error403)
+                    .render()
+                {
+                    write!(f, "{}", page.into_string())
+                } else {
+                    write!(f, "Access Denied")
+                }
+            }
+            // Error 404.
+            ErrorPage::NotFound(request) => {
+                let error_page = Page::new(request.clone());
+                if let Ok(page) = error_page
+                    .with_title(L10n::n("Error RESOURCE NOT FOUND"))
+                    .with_layout("error")
+                    .with_component(Error404)
+                    .render()
+                {
+                    write!(f, "{}", page.into_string())
+                } else {
+                    write!(f, "Not Found")
+                }
+            }
+            // Error 412.
+            ErrorPage::PreconditionFailed(_) => write!(f, "Precondition Failed"),
+            // Error 500.
+            ErrorPage::InternalError(_) => write!(f, "Internal Error"),
+            // Error 504.
+            ErrorPage::Timeout(_) => write!(f, "Timeout"),
+        }
+    }
+}
+
+impl ResponseError for ErrorPage {
+    fn error_response(&self) -> HttpResponse {
+        HttpResponse::build(self.status_code())
+            .insert_header(ContentType::html())
+            .body(self.to_string())
+    }
+
+    #[rustfmt::skip]
+    fn status_code(&self) -> StatusCode {
+        match self {
+            ErrorPage::NotModified(_)        => StatusCode::NOT_MODIFIED,
+            ErrorPage::BadRequest(_)         => StatusCode::BAD_REQUEST,
+            ErrorPage::AccessDenied(_)       => StatusCode::FORBIDDEN,
+            ErrorPage::NotFound(_)           => StatusCode::NOT_FOUND,
+            ErrorPage::PreconditionFailed(_) => StatusCode::PRECONDITION_FAILED,
+            ErrorPage::InternalError(_)      => StatusCode::INTERNAL_SERVER_ERROR,
+            ErrorPage::Timeout(_)            => StatusCode::GATEWAY_TIMEOUT,
+        }
+    }
+}
diff --git a/pagetop/src/response/redirect.rs b/pagetop/src/response/redirect.rs
new file mode 100644
index 00000000..3b6f0646
--- /dev/null
+++ b/pagetop/src/response/redirect.rs
@@ -0,0 +1,76 @@
+//! Perform redirections in HTTP.
+//!
+//! **URL redirection**, also known as *URL forwarding*, is a technique to give more than one URL
+//! address to a web resource. HTTP has a response called ***HTTP redirect*** for this operation
+//! (see [Redirections in HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP/Redirections)).
+//!
+//! There are several types of redirects, sorted into three categories:
+//!
+//!   * **Permanent redirections**. These redirections are meant to last forever. They imply that
+//!     the original URL should no longer be used, and replaced with the new one. Search engine
+//!     robots, RSS readers, and other crawlers will update the original URL for the resource.
+//!
+//!   * **Temporary redirections**. Sometimes the requested resource can't be accessed from its
+//!     canonical location, but it can be accessed from another place. In this case, a temporary
+//!     redirect can be used. Search engine robots and other crawlers don't memorize the new,
+//!     temporary URL. Temporary redirections are also used when creating, updating, or deleting
+//!     resources, to show temporary progress pages.
+//!
+//!   * **Special redirections**.
+
+use crate::service::HttpResponse;
+
+pub struct Redirect;
+
+impl Redirect {
+    /// Permanent redirection. Status Code **301**. GET methods unchanged. Others may or may not be
+    /// changed to GET. Typical for reorganization of a website.
+    pub fn moved(redirect_to_url: &str) -> HttpResponse {
+        HttpResponse::MovedPermanently()
+            .append_header(("Location", redirect_to_url))
+            .finish()
+    }
+
+    /// Permanent redirection. Status Code **308**. Method and body not changed. Typical for
+    /// reorganization of a website, with non-GET links/operations.
+    pub fn permanent(redirect_to_url: &str) -> HttpResponse {
+        HttpResponse::PermanentRedirect()
+            .append_header(("Location", redirect_to_url))
+            .finish()
+    }
+
+    /// Temporary redirection. Status Code **302**. GET methods unchanged. Others may or may not be
+    /// changed to GET. Used when the web page is temporarily unavailable for unforeseen reasons.
+    pub fn found(redirect_to_url: &str) -> HttpResponse {
+        HttpResponse::Found()
+            .append_header(("Location", redirect_to_url))
+            .finish()
+    }
+
+    /// Temporary redirection. Status Code **303**. GET methods unchanged. Others changed to GET
+    /// (body lost). Used to redirect after a PUT or a POST, so that refreshing the result page
+    /// doesn't re-trigger the operation.
+    pub fn see_other(redirect_to_url: &str) -> HttpResponse {
+        HttpResponse::SeeOther()
+            .append_header(("Location", redirect_to_url))
+            .finish()
+    }
+
+    /// Temporary redirection. Status Code **307**. Method and body not changed. The web page is
+    /// temporarily unavailable for unforeseen reasons. Better than [`found()`](Self::found) when
+    /// non-GET operations are available on the site.
+    pub fn temporary(redirect_to_url: &str) -> HttpResponse {
+        HttpResponse::TemporaryRedirect()
+            .append_header(("Location", redirect_to_url))
+            .finish()
+    }
+
+    /// Special redirection. Status Code **304**. Redirects a page to the locally cached copy (that
+    /// was stale). Sent for revalidated conditional requests. Indicates that the cached response is
+    /// still fresh and can be used.
+    pub fn not_modified(redirect_to_url: &str) -> HttpResponse {
+        HttpResponse::NotModified()
+            .append_header(("Location", redirect_to_url))
+            .finish()
+    }
+}
diff --git a/pagetop/src/service.rs b/pagetop/src/service.rs
new file mode 100644
index 00000000..01d82d56
--- /dev/null
+++ b/pagetop/src/service.rs
@@ -0,0 +1,64 @@
+//! Essential web framework ([actix-web](https://docs.rs/actix-web)).
+
+pub use actix_session::Session;
+pub use actix_web::body::BoxBody;
+pub use actix_web::dev::Server;
+pub use actix_web::dev::ServiceFactory as Factory;
+pub use actix_web::dev::ServiceRequest as Request;
+pub use actix_web::dev::ServiceResponse as Response;
+pub use actix_web::{cookie, get, http, rt, test, web};
+pub use actix_web::{App, Error, HttpMessage, HttpRequest, HttpResponse, HttpServer, Responder};
+
+pub use actix_web_files::Files as ActixFiles;
+pub use actix_web_static_files::ResourceFiles;
+
+#[macro_export]
+macro_rules! include_files {
+    ( $bundle:ident ) => {
+        $crate::paste! {
+            mod [<static_files_ $bundle>] {
+                include!(concat!(env!("OUT_DIR"), "/", stringify!($bundle), ".rs"));
+            }
+        }
+    };
+    ( $STATIC:ident => $bundle:ident ) => {
+        $crate::paste! {
+            mod [<static_files_ $bundle>] {
+                include!(concat!(env!("OUT_DIR"), "/", stringify!($bundle), ".rs"));
+            }
+            pub static $STATIC: std::sync::LazyLock<StaticResources> = std::sync::LazyLock::new(
+                [<static_files_ $bundle>]::$bundle
+            );
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! include_files_service {
+    ( $scfg:ident, $bundle:ident => $path:expr $(, [$root:expr, $relative:expr])? ) => {{
+        $crate::paste! {
+            let span = $crate::trace::debug_span!("Configuring static files ", path = $path);
+            let _ = span.in_scope(|| {
+                #[allow(unused_mut)]
+                let mut serve_embedded:bool = true;
+                $(
+                    if !$root.is_empty() && !$relative.is_empty() {
+                        if let Ok(absolute) = $crate::util::absolute_dir($root, $relative) {
+                            $scfg.service($crate::service::ActixFiles::new(
+                                $path,
+                                absolute,
+                            ).show_files_listing());
+                            serve_embedded = false
+                        }
+                    }
+                )?
+                if serve_embedded {
+                    $scfg.service($crate::service::ResourceFiles::new(
+                        $path,
+                        [<static_files_ $bundle>]::$bundle(),
+                    ));
+                }
+            });
+        }
+    }};
+}
diff --git a/pagetop/src/trace.rs b/pagetop/src/trace.rs
new file mode 100644
index 00000000..6e42d790
--- /dev/null
+++ b/pagetop/src/trace.rs
@@ -0,0 +1,84 @@
+//! Application tracing and event logging.
+//!
+//! `PageTop` collects application diagnostic information in a structured and event-based manner.
+//!
+//! In asynchronous systems, interpreting traditional log messages often becomes complicated.
+//! Individual tasks are multiplexed to the same thread, and associated events and log messages get
+//! intermingled, making it difficult to follow the logical sequence.
+//!
+//! `PageTop` uses [`tracing`](https://docs.rs/tracing) to allow **applications** and **modules** to
+//! log structured events with added information about *temporality* and *causality*. Unlike a log
+//! message, a span has a start and end time, can enter and exit the execution flow, and can exist
+//! within a nested tree of similar spans. Additionally, these spans are *structured*, with the
+//! ability to record data types and text messages.
+
+use crate::global;
+
+pub use tracing::{debug, error, info, trace, warn};
+pub use tracing::{debug_span, error_span, info_span, trace_span, warn_span};
+
+use tracing_appender::non_blocking::WorkerGuard;
+use tracing_subscriber::EnvFilter;
+
+use std::sync::LazyLock;
+
+/// Application tracing and event logging.
+///
+/// To increase performance, a dedicated thread uses a non-blocking writer system that acts
+/// periodically instead of sending each trace or event instantly. If the program terminates
+/// abruptly (e.g., due to a panic! or a `std::process::exit`), some traces or events might not be
+/// sent.
+///
+/// Since traces or events logged shortly before an application crash are often important for
+/// diagnosing the cause of the failure, `Lazy<WorkerGuard>` ensures that all stored logs are sent
+/// before terminating execution.
+
+#[rustfmt::skip]
+pub(crate) static TRACING: LazyLock<WorkerGuard> = LazyLock::new(|| {
+    let env_filter = EnvFilter::try_new(&global::SETTINGS.log.tracing)
+        .unwrap_or_else(|_| EnvFilter::new("Info"));
+
+    let rolling = global::SETTINGS.log.rolling.to_lowercase();
+
+    let (non_blocking, guard) = match rolling.as_str() {
+        "stdout" => tracing_appender::non_blocking(std::io::stdout()),
+        _ => tracing_appender::non_blocking({
+            let path = &global::SETTINGS.log.path;
+            let prefix = &global::SETTINGS.log.prefix;
+            match rolling.as_str() {
+                "daily"    => tracing_appender::rolling::daily(path, prefix),
+                "hourly"   => tracing_appender::rolling::hourly(path, prefix),
+                "minutely" => tracing_appender::rolling::minutely(path, prefix),
+                "endless"  => tracing_appender::rolling::never(path, prefix),
+                _ => {
+                    println!(
+                        "Rolling value \"{}\" not valid. Using \"daily\". Check the settings file.",
+                        global::SETTINGS.log.rolling,
+                    );
+                    tracing_appender::rolling::daily(path, prefix)
+                }
+            }
+        }),
+    };
+
+    let subscriber = tracing_subscriber::fmt()
+        .with_env_filter(env_filter)
+        .with_writer(non_blocking)
+        .with_ansi(rolling.as_str() == "stdout");
+
+    match global::SETTINGS.log.format.to_lowercase().as_str() {
+        "json"    => subscriber.json().init(),
+        "full"    => subscriber.init(),
+        "compact" => subscriber.compact().init(),
+        "pretty"  => subscriber.pretty().init(),
+        _ => {
+            println!(
+                "Tracing format \"{}\" not valid. Using \"Full\". Check the settings file.",
+                global::SETTINGS.log.format,
+            );
+            subscriber.init();
+        }
+    }
+
+    guard
+});
diff --git a/pagetop/src/util.rs b/pagetop/src/util.rs
new file mode 100644
index 00000000..a34ee599
--- /dev/null
+++ b/pagetop/src/util.rs
@@ -0,0 +1,161 @@
+//! Useful functions and macros.
+
+use crate::trace;
+
+use std::io;
+use std::path::PathBuf;
+
+// USEFUL FUNCTIONS ********************************************************************************
+
+pub enum TypeInfo {
+    FullName,
+    ShortName,
+    NameFrom(isize),
+    NameTo(isize),
+    PartialName(isize, isize),
+}
+
+impl TypeInfo {
+    pub fn of<T: ?Sized>(&self) -> &'static str {
+        let type_name = std::any::type_name::<T>();
+        match self {
+            TypeInfo::FullName => type_name,
+            TypeInfo::ShortName => Self::partial(type_name, -1, None),
+            TypeInfo::NameFrom(start) => Self::partial(type_name, *start, None),
+            TypeInfo::NameTo(end) => Self::partial(type_name, 0, Some(*end)),
+            TypeInfo::PartialName(start, end) => Self::partial(type_name, *start, Some(*end)),
+        }
+    }
+
+    fn partial(type_name: &'static str, start: isize, end: Option<isize>) -> &'static str {
+        let maxlen = type_name.len();
+        let mut segments = Vec::new();
+        let mut segment_start = 0; // Start position of the current segment.
+        let mut angle_brackets = 0; // Counter for tracking '<' and '>'.
+        let mut previous_char = '\0'; // Initializes to a null character, no previous character.
+
+        for (idx, c) in type_name.char_indices() {
+            match c {
+                ':' if angle_brackets == 0 => {
+                    if previous_char == ':' {
+                        if segment_start < idx - 1 {
+                            segments.push((segment_start, idx - 1)); // Do not include last '::'.
+                        }
+                        segment_start = idx + 1; // Next segment starts after '::'.
+                    }
+                }
+                '<' => angle_brackets += 1,
+                '>' => angle_brackets -= 1,
+                _ => {}
+            }
+            previous_char = c;
+        }
+
+        // Include the last segment if there's any.
+        if segment_start < maxlen {
+            segments.push((segment_start, maxlen));
+        }
+
+        // Calculates the start position.
+        let start_pos = segments
+            .get(if start >= 0 {
+                start as usize
+            } else {
+                segments.len() - start.unsigned_abs()
+            })
+            .map_or(0, |&(s, _)| s);
+
+        // Calculates the end position.
+        let end_pos = segments
+            .get(if let Some(end) = end {
+                if end >= 0 {
+                    end as usize
+                } else {
+                    segments.len() - end.unsigned_abs()
+                }
+            } else {
+                segments.len() - 1
+            })
+            .map_or(maxlen, |&(_, e)| e);
+
+        // Returns the partial string based on the calculated positions.
+        &type_name[start_pos..end_pos]
+    }
+}
+
+/// Calculates the absolute directory given a root path and a relative path.
+///
+/// # Arguments
+///
+/// * `root_path` - A string slice that holds the root path.
+/// * `relative_path` - A string slice that holds the relative path.
+///
+/// # Returns
+///
+/// * `Ok` - If the operation is successful, returns the absolute directory as a `String`.
+/// * `Err` - If an I/O error occurs, returns an `io::Error`.
+///
+/// # Errors
+///
+/// This function will return an error if:
+/// - The root path or relative path are invalid.
+/// - There is an issue with file system operations, such as reading the directory.
+///
+/// # Examples
+///
+/// ```
+/// let root = "/home/user";
+/// let relative = "documents";
+/// let abs_dir = absolute_dir(root, relative).unwrap();
+/// println!("{}", abs_dir);
+/// ```
+pub fn absolute_dir(
+    root_path: impl Into<String>,
+    relative_path: impl Into<String>,
+) -> Result<String, io::Error> {
+    let root_path = PathBuf::from(root_path.into());
+    let full_path = root_path.join(relative_path.into());
+    let absolute_dir = full_path.to_string_lossy().into();
+
+    if !full_path.is_absolute() {
+        let message = format!("Path \"{absolute_dir}\" is not absolute");
+        trace::warn!(message);
+        return Err(io::Error::new(io::ErrorKind::InvalidInput, message));
+    }
+
+    if !full_path.exists() {
+        let message = format!("Path \"{absolute_dir}\" does not exist");
+        trace::warn!(message);
+        return Err(io::Error::new(io::ErrorKind::NotFound, message));
+    }
+
+    if !full_path.is_dir() {
+        let message = format!("Path \"{absolute_dir}\" is not a directory");
+        trace::warn!(message);
+        return Err(io::Error::new(io::ErrorKind::InvalidInput, message));
+    }
+
+    Ok(absolute_dir)
+}
+
+// USEFUL MACROS ***********************************************************************************
+
+#[macro_export]
+/// Macro para construir grupos de pares clave-valor.
+///
+/// ```rust#ignore
+/// let args = kv![
+///     "userName" => "Roberto",
+///     "photoCount" => 3,
+///     "userGender" => "male",
+/// ];
+/// ```
+macro_rules! kv {
+    ( $($key:expr => $value:expr),* $(,)? ) => {{
+        let mut a = std::collections::HashMap::new();
+        $(
+            a.insert($key.into(), $value.into());
+        )*
+        a
+    }};
+}
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