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"?>
    <alltransclusions gatcontinue="Chronik_Juli" />
      <page ns="10" title="Vorlage:Bild-frei" missing="" />
      <page ns="10" title="Vorlage:Bildbeschreibung" missing="" />
      <page ns="10" title="Vorlage:CC-by-nc-sa-2.0" missing="" />
      <page pageid="5714" ns="10" title="Vorlage:Begrüßung" />
      <page pageid="11067" ns="10" title="Vorlage:Bezirksverband der Kleingärtner e.V. Göttingen" />
      <page pageid="8361" ns="10" title="Vorlage:Chronik April" />
      <page pageid="8365" ns="10" title="Vorlage:Chronik August" />
      <page pageid="8369" ns="10" title="Vorlage:Chronik Dezember" />
      <page pageid="8360" ns="10" title="Vorlage:Chronik Februar" />
      <page pageid="8358" ns="10" title="Vorlage:Chronik Januar" />