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>
    <allredirects garcontinue="Eye_for_an_Eye:_The_Cure" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2334" ns="0" title="Beck" />
      <page pageid="2804" ns="0" title="Body, Mind, and Heart" />
      <page pageid="1422" ns="0" title="Chita" />
      <page pageid="15" ns="0" title="Church Of Glabados" />
      <page pageid="219" ns="0" title="Cutscenes" />
      <page pageid="1557" ns="0" title="Demona" />
      <page pageid="2323" ns="0" title="Disarray Grimstone" />
      <page pageid="1622" ns="0" title="Emperor Mateus" />
      <page pageid="2447" ns="0" title="Eric B. Mimsy III" />
      <page pageid="1667" ns="0" title="Eye for an Eye: Curse Removal 101" />
    </pages>
  </query>
</api>