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HTML is good for debugging, but probably is not suitable for your application.
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<?xml version="1.0"?>
<api>
  <query>
    <gadgets>
      <gadget id="Use_MediaWiki_Search" desc="Use MediaWiki Search Engine" />
      <gadget id="Loader_Test" desc="Loader Test" />
      <gadget id="Beta_Features" desc="Enable Beta Features" />
    </gadgets>
  </query>
</api>