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="Bandverzeichnis|4128" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1705" ns="0" title="Lehren der Götter (Schrift)" />
      <page pageid="1793" ns="0" title="Chromanin (Schrift)" />
      <page pageid="3670" ns="0" title="Die Kreise der Magie (Schrift)" />
      <page pageid="3672" ns="0" title="Runenbücher der Feuermagier (Schrift)" />
      <page pageid="3731" ns="0" title="Alchemie (Schrift)" />
      <page pageid="3732" ns="0" title="Arkanum Golum (Schrift)" />
      <page pageid="3733" ns="0" title="Hierarchien (Schrift)" />
      <page pageid="3734" ns="0" title="Jagd und Beute, Sammelwerk (Schrift)" />
      <page pageid="3749" ns="0" title="Verstaubtes Buch (Schrift)" />
      <page pageid="3751" ns="0" title="Farbige Steintafeln (Schrift)" />
    </pages>
  </query>
</api>