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>
    <alltransclusions>
      <t ns="10" title="Vorlage:Digital Infrastructure Metrics" />
      <t ns="10" title="Vorlage:Direct Buyer Feedback" />
      <t ns="10" title="Vorlage:How long should I wait before dropping the price?" />
      <t ns="10" title="Vorlage:In-Person Engagement" />
      <t ns="10" title="Vorlage:Price Adjustment Strategy" />
      <t ns="10" title="Vorlage:Refreshing Marketing Assets" />
      <t ns="10" title="Vorlage:Should I take the property off the market and try again later?" />
      <t ns="10" title="Vorlage:The Expiry of an Agency Agreement" />
      <t ns="10" title="Vorlage:Will a history of not selling damage my property&#039;s reputation?" />
    </alltransclusions>
  </query>
</api>