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="Gentoo_Infrastructure" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Backup (OpenLDAP)" missing="" />
      <page ns="0" title="Backup (Server Setup)" missing="" />
      <page ns="0" title="Benutzer:Chaf" missing="" />
      <page ns="0" title="Benutzer Diskussion:Chaf" missing="" />
      <page ns="0" title="Daemon" missing="" />
      <page pageid="286" ns="0" title="Binary Package Server" />
      <page pageid="285" ns="0" title="Build Server" />
      <page pageid="62" ns="0" title="Coding Standards" />
      <page pageid="388" ns="0" title="Customer VM Naming Convention" />
      <page pageid="137" ns="0" title="Documentation" />
    </pages>
  </query>
</api>