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>
    <querypage name="Ancientpages">
      <results>
        <page value="20140106175725" timestamp="2014-01-06T17:57:25Z" ns="0" title="Construction Article" />
        <page value="20140106185143" timestamp="2014-01-06T18:51:43Z" ns="0" title="Practical Electronics" />
        <page value="20140108215051" timestamp="2014-01-08T21:50:51Z" ns="0" title="Parts List" />
        <page value="20140108221548" timestamp="2014-01-08T22:15:48Z" ns="0" title="ROM Images" />
        <page value="20140113043054" timestamp="2014-01-13T04:30:54Z" ns="0" title="Motherboard Versions" />
        <page value="20140113053633" timestamp="2014-01-13T05:36:33Z" ns="0" title="Followup Articles" />
        <page value="20140113191717" timestamp="2014-01-13T19:17:17Z" ns="0" title="Compukit.org" />
        <page value="20140116204352" timestamp="2014-01-16T20:43:52Z" ns="0" title="Manuals" />
      </results>
    </querypage>
  </query>
</api>