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="20140912181343" timestamp="2014-09-12T18:13:43Z" ns="0" title="Hall sensor" />
        <page value="20140913125355" timestamp="2014-09-13T12:53:55Z" ns="0" title="Arduino crash course" />
        <page value="20140913222525" timestamp="2014-09-13T22:25:25Z" ns="0" title="Relay" />
        <page value="20140914094810" timestamp="2014-09-14T09:48:10Z" ns="0" title="Wiki help" />
        <page value="20140914132556" timestamp="2014-09-14T13:25:56Z" ns="0" title="Sound module" />
        <page value="20140914132728" timestamp="2014-09-14T13:27:28Z" ns="0" title="Rain sensor" />
        <page value="20141119013251" timestamp="2014-11-19T01:32:51Z" ns="0" title="Dropsensor" />
        <page value="20150115130248" timestamp="2015-01-15T13:02:48Z" ns="0" title="Lawn sensor" />
        <page value="20150227123148" timestamp="2015-02-27T12:31:48Z" ns="0" title="Getting started" />
        <page value="20150227131934" timestamp="2015-02-27T13:19:34Z" ns="0" title="Kalman" />
      </results>
    </querypage>
  </query>
</api>