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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-continue>
    <allpages gapfrom="Rescue From Shieldhaven Prison" />
  </query-continue>
  <query>
    <pages>
      <page pageid="7253" ns="0" title="Reactions and Traits">
        <revisions>
          <rev />
        </revisions>
      </page>
      <page pageid="9398" ns="0" title="Reinforced Door">
        <revisions>
          <rev />
        </revisions>
      </page>
    </pages>
  </query>
  <warnings>
    <revisions xml:space="preserve">Unrecognized value for parameter 'rvprop': content&quot;</revisions>
  </warnings>
</api>