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HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <embeddedin>
      <ei pageid="2212" ns="0" title="NPC" />
      <ei pageid="2273" ns="0" title="Modern" />
      <ei pageid="2352" ns="0" title="Fingerprint Ambassador" />
      <ei pageid="2374" ns="0" title="Double Modern" />
    </embeddedin>
  </query>
</api>