You are looking at the HTML representation of the XML format.
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-continue>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20130904205135" timestamp="2013-09-04T20:51:35Z" ns="0" title="Market value" />
        <page value="20130904205234" timestamp="2013-09-04T20:52:34Z" ns="0" title="Fair value" />
        <page value="20130910124655" timestamp="2013-09-10T12:46:55Z" ns="0" title="Total Compensation" />
        <page value="20130910124849" timestamp="2013-09-10T12:48:49Z" ns="0" title="Executives" />
        <page value="20130910184534" timestamp="2013-09-10T18:45:34Z" ns="0" title="Agency Accounting Identifier (AAI)" />
        <page value="20130910184715" timestamp="2013-09-10T18:47:15Z" ns="0" title="Architect-Engineer Contract Administration Support Systems" />
        <page value="20130910185318" timestamp="2013-09-10T18:53:18Z" ns="0" title="Bid and Proposal" />
        <page value="20130910190048" timestamp="2013-09-10T19:00:48Z" ns="0" title="Construction Contractor Appraisal Support System" />
        <page value="20130910190705" timestamp="2013-09-10T19:07:05Z" ns="0" title="Contract Line Item Number (CLIN)" />
        <page value="20130910190754" timestamp="2013-09-10T19:07:54Z" ns="0" title="Cost of Sales" />
      </results>
    </querypage>
  </query>
</api>