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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>
    <allimages gaifrom="CC-HSY-S.PNG" />
  </query-continue>
  <query>
    <pages>
      <page ns="6" title="File:Ambox content.png" missing="" />
      <page pageid="3379" ns="6" title="File:ANormalize-Big Bend.PNG" />
      <page pageid="3378" ns="6" title="File:ANormalize Example.PNG" />
      <page pageid="3123" ns="6" title="File:Ambox notice.png" />
      <page pageid="3381" ns="6" title="File:BlendColour.PNG" />
      <page pageid="2421" ns="6" title="File:Bounding box.dvrc">
        <duplicatefiles>
          <df name="bounding_box.dvrc" user="Keith" timestamp="2006-05-08T17:30:11Z" />
        </duplicatefiles>
      </page>
      <page pageid="3422" ns="6" title="File:CC-HSL-H.PNG" />
      <page pageid="3423" ns="6" title="File:CC-HSL-L.PNG" />
      <page pageid="3424" ns="6" title="File:CC-HSL-S.PNG" />
      <page pageid="3425" ns="6" title="File:CC-HSY-H.PNG" />
    </pages>
  </query>
</api>