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HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <querypage name="Ancientpages">
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        <page value="20130507094405" timestamp="2013-05-07T09:44:05Z" ns="0" title="GeneXplain GmbH" />
        <page value="20130507094445" timestamp="2013-05-07T09:44:45Z" ns="0" title="Institute of Systems Biology" />
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        <page value="20130508092123" timestamp="2013-05-08T09:21:23Z" ns="0" title="Solver (extension point)" />
      </results>
    </querypage>
  </query>
  <query-continue>
    <querypage qpoffset="10" />
  </query-continue>
</api>