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>
    <alltransclusions gatcontinue="Click|635" />
  </query-continue>
  <query>
    <pages>
      <page pageid="130" ns="10" title="Vorlage:Click with text" />
      <page pageid="191" ns="10" title="Vorlage:Überarbeiten" />
      <page pageid="193" ns="10" title="Vorlage:Tausendfach verwendet" />
      <page pageid="197" ns="10" title="Vorlage:Überarbeiten/Doku" />
      <page pageid="210" ns="0" title="Servicearbeiten Fahrzeuge mit Rover K" />
      <page pageid="217" ns="0" title="Wiki" />
      <page pageid="364" ns="0" title="Scheibenwischer" />
      <page pageid="390" ns="10" title="Vorlage:Elise Wiki Icons" />
      <page pageid="633" ns="0" title="Startseite Mobil" />
    </pages>
  </query>
</api>