[Nutch Wiki] Trivial Update of "WhichTechnicalConceptsAreBehindTheNutchPluginSystem" by LewisJohnMcgibbney

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The "WhichTechnicalConceptsAreBehindTheNutchPluginSystem" page has been changed by LewisJohnMcgibbney:
http://wiki.apache.org/nutch/WhichTechnicalConceptsAreBehindTheNutchPluginSystem?action=diff&rev1=2&rev2=3

  
  The plugin repository is a kind of registry data base for Nutch plugins until runtime, and the heart of the plugin system. After a plugin dependency validation, extension points and corresponding extensions are registered in the Repository. At runtime, an extension point must query the repository for installed extensions to invoke them. Further more the plugin repository handles the plugin life cycle by invoking the startUp and shutDown methods of a plugin class and manages the class-loaders of the plugins.
  
+ <<<PluginCentral
+