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>
    <allredirects garcontinue="Unternehmensberatung_Wenzel_-_DIN_14675_Zertifizierung" />
  </query-continue>
  <query>
    <pages>
      <page pageid="461" ns="0" title="BE-Plan GmbH &amp; Co. KG" />
      <page pageid="185" ns="0" title="Brandmelderzentralen DIN EN 54-2" />
      <page pageid="20" ns="0" title="Definition Vorbeugender Brandschutz" />
      <page pageid="294" ns="0" title="Feuerwehr-Anzeigetableau" />
      <page pageid="75" ns="0" title="Flammenmelder DIN EN 54 Teil 10" />
      <page pageid="412" ns="0" title="Kompaktschaum" />
      <page pageid="154" ns="0" title="Krefeld" />
      <page pageid="567" ns="0" title="RSGAG" />
      <page pageid="23" ns="0" title="Rauchmelder linear DIN EN 54 Teil 12" />
      <page pageid="376" ns="0" title="Total Walther GmbH" />
    </pages>
  </query>
</api>