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="CATAutoLogoff.CATSettings" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="CAT3DXml.CATSettings" missing="" />
      <page pageid="243" ns="0" title="BREP" />
      <page pageid="82" ns="0" title="Batch-Tools" />
      <page pageid="229" ns="0" title="Begriffe Assembly Design" />
      <page pageid="230" ns="0" title="Begriffe Drafting" />
      <page pageid="227" ns="0" title="Begriffe Generative Shape Design" />
      <page pageid="226" ns="0" title="Begriffe Infrastructure" />
      <page pageid="225" ns="0" title="Begriffe Part Design" />
      <page pageid="228" ns="0" title="Begriffe Surface Design" />
      <page pageid="85" ns="0" title="Blechteile" />
    </pages>
  </query>
</api>