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="20100403112223" timestamp="2010-04-03T11:22:23Z" ns="0" title="Main Page" />
        <page value="20100403132813" timestamp="2010-04-03T13:28:13Z" ns="0" title="Ymos av Binkh" />
        <page value="20100403134303" timestamp="2010-04-03T13:43:03Z" ns="0" title="Prästinna" />
        <page value="20100405134227" timestamp="2010-04-05T13:42:27Z" ns="0" title="Högdrakar" />
        <page value="20100405142210" timestamp="2010-04-05T14:22:10Z" ns="0" title="Thalamur: medborgare" />
        <page value="20100405142400" timestamp="2010-04-05T14:24:00Z" ns="0" title="Thalamur: folket" />
        <page value="20100420081214" timestamp="2010-04-20T08:12:14Z" ns="0" title="Skriftspråk" />
        <page value="20100511143338" timestamp="2010-05-11T14:33:38Z" ns="0" title="Jordmoderns Kloster" />
        <page value="20100511144015" timestamp="2010-05-11T14:40:15Z" ns="0" title="Utharitus" />
        <page value="20100512162631" timestamp="2010-05-12T16:26:31Z" ns="0" title="Teraval Tarabum" />
      </results>
    </querypage>
  </query>
</api>