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="20110126043852" timestamp="2011-01-26T04:38:52Z" ns="0" title="Zygotic life cycle" />
        <page value="20110126043915" timestamp="2011-01-26T04:39:15Z" ns="0" title="Zygote" />
        <page value="20110126043936" timestamp="2011-01-26T04:39:36Z" ns="0" title="Zygospore" />
        <page value="20110126044007" timestamp="2011-01-26T04:40:07Z" ns="0" title="Zygomycete" />
        <page value="20110126044129" timestamp="2011-01-26T04:41:29Z" ns="0" title="Zone of maturation" />
        <page value="20110126044142" timestamp="2011-01-26T04:41:42Z" ns="0" title="Zone of elongation" />
        <page value="20110126044154" timestamp="2011-01-26T04:41:54Z" ns="0" title="Zoecium" />
        <page value="20110126044206" timestamp="2011-01-26T04:42:06Z" ns="0" title="Zero population growth" />
        <page value="20110126044217" timestamp="2011-01-26T04:42:17Z" ns="0" title="Z scheme" />
        <page value="20110126044230" timestamp="2011-01-26T04:42:30Z" ns="0" title="Z line" />
      </results>
    </querypage>
  </query>
</api>