Defines the capability of a class to be plugged into Nutch.
A nutch-plugin is an container for a set of custom logic that provide extensions to the nutch core functionality or another plugin that provides an API for extending.
The plugin repositority is a registry of all plugins.
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,
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
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