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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>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <images>
          <im ns="6" title="File:Image 1st control training.jpg" />
          <im ns="6" title="File:Image Attackpoint identification training.jpg" />
          <im ns="6" title="File:Image Book reading while running.jpg" />
          <im ns="6" title="File:Image Brown map.jpg" />
          <im ns="6" title="File:Image Control picking.jpg" />
          <im ns="6" title="File:Image Corridor orienteering.jpg" />
          <im ns="6" title="File:Image Course planner for competition.jpg" />
          <im ns="6" title="File:Image Downhill intervals.jpg" />
          <im ns="6" title="File:Image Draw simplification map.jpg" />
          <im ns="6" title="File:Image Map surveying.jpg" />
        </images>
      </page>
    </pages>
  </query>
  <query-continue>
    <images imcontinue="1|Image Map without paths.jpg" />
  </query-continue>
</api>