org.eclipse.m2e.wtp.overlay/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.2"?>
<plugin>
     <extension
         point="org.eclipse.wst.common.modulecore.referenceResolver">
      <resolver
            class="org.eclipse.m2e.wtp.overlay.modulecore.OverlayReferenceResolver"
            id="org.maven.ide.eclipse.wtp.overlay.modulecore.OverlayReferenceResolver">
      </resolver>
   </extension>

   <extension point="org.eclipse.core.runtime.preferences">
      <initializer class="org.eclipse.m2e.wtp.overlay.internal.preferences.OverlayPreferencesInitializer"/>
   </extension>
     
</plugin>