org.eclipse.help/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>
<plugin
   id="org.eclipse.help"
   name="%help_plugin_name"
   version="3.0.0"
   provider-name="%providerName"
   class="org.eclipse.help.internal.HelpPlugin">

   <runtime>
      <library name="help.jar">
         <export name="*"/>
         <packages prefixes="org.eclipse.help"/>
      </library>
   </runtime>

<!-- Extension points -->
   <extension-point id="contexts" name="%contexts_extension_point_name" schema="schema/contexts.exsd"/>
   <extension-point id="toc" name="%toc_extension_point_name" schema="schema/toc.exsd"/>
   <extension-point id="contentProducer" name="%content_producer_extension_point_name" schema="schema/contentProducer.exsd"/>

<!--  Help URL protocols -->
   <extension
         point="org.eclipse.core.runtime.urlHandlers">
      <handler
            class="org.eclipse.help.internal.protocols.URLHandler"
            protocol="help">
      </handler>
   </extension>

</plugin>