title: Where can I find the Schema for the SDL Tridion UI extensions configuration file
body: <p>I downloaded the <a href="http://www.julianwraith.com/2010/10/helloworld-extension-for-tridion-2011/">HelloWorld Extension for Tridion 2011</a> code to get started with it and everything is working, but I was wondering where I can find more information about the options in the configuration file. </p>
  
  <p>For instance is there a Schema available for the UI extension configuration, in particular for the <strong>cfg:</strong> (http://www.sdltridion.com/2009/GUI/Configuration), <strong>ext:</strong> (http://www.sdltridion.com/2009/GUI/extensions) and <strong>cmenu:</strong> (http://www.sdltridion.com/2009/GUI/extensions/ContextMenu) namespaces?  </p>