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>
    <alllinks galcontinue="Baatezu|134" />
  </query-continue>
  <query>
    <pages>
      <page pageid="41" ns="0" title="Timeline" />
      <page pageid="130" ns="0" title="Inhabitants of Carceri" />
      <page pageid="131" ns="0" title="Inhabitants of Grey Waste" />
      <page pageid="132" ns="0" title="Inhabitants of Gehenna" />
      <page pageid="133" ns="0" title="Inhabitants of Baator" />
      <page pageid="141" ns="0" title="Inhabitants of Astral Plane" />
      <page pageid="773" ns="0" title="Lords of the Nine" />
      <page pageid="775" ns="0" title="Dark Eight" />
      <page pageid="1107" ns="0" title="Dis (city)" />
      <page pageid="1110" ns="0" title="Bel" />
    </pages>
  </query>
</api>