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="Class:Beastlord_Orwak" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="CastStack-saha" missing="" />
      <page ns="0" title="CitadelofVuul" missing="" />
      <page pageid="2107" ns="0" title="Berserker Dudester" />
      <page pageid="1443" ns="0" title="CastingStack" />
      <page pageid="2290" ns="0" title="Class:Assassin Rodent" />
      <page pageid="1756" ns="0" title="Class:Assassin bjcasey" />
      <page pageid="2028" ns="0" title="Class:Assassin kevinshp" />
      <page pageid="1955" ns="0" title="Class:Beastlord Ali" />
      <page pageid="2121" ns="0" title="Class:Beastlord Dudester" />
      <page pageid="1998" ns="0" title="Class:Beastlord Insanitywiz" />
    </pages>
  </query>
</api>