For your extended plug-in, you need to create a plugin-descriptor.xml file for your plug-in. If your plug-in extends an existing plug-in, you must indicate that the new plug-in depends on the existing plug-in. In the plugin-descriptor.xml file for the extended plug-in, use the pluginRef child element of the dependencyList element to indicate that your new plug-in depends on the plug-in that your are extending.
For more information about the dependencyList element, see <dependencyList> Element in Sun N1 Service Provisioning System 5.2 XML Schema Reference Guide.
For instructions about how to create the plugin-descriptor.xml file, see Defining the Plug-In.