The Nutch {@link org.apache.nutch.plugin.Pluggable Plugin} System.

The Nutch Plugin System provides a way to extend nutch functionality. A large part of the functionality of Nutch are provided by plugins: All of the parsing, indexing and searching that nutch does is actually accomplished by various plugins.

In writing a plugin, you're actually providing one or more extensions of the existing extension-points (hooks). The core Nutch extension-points are themselves defined in a plugin, the `nutch-extensionpoints` plugin. Each extension-point defines an interface that must be implemented by the extension. The core extension-points and extensions available in Nutch are listed in the {@link org.apache.nutch.plugin.Pluggable} interface.

@see Nutch plugin manifest DTD @see Plugin Central @see About Plugins @see Why Nutch has a Plugin System? @see Which technical concepts are behind the nutch plugin system? @see What's the problem with Plugins and Class loading? @see Writing Plugin Example