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="Cite_web|352" />
  </query-continue>
  <query>
    <pages>
      <page pageid="72" ns="0" title="Templates" />
      <page pageid="81" ns="10" title="Template:Chart/start" />
      <page pageid="82" ns="0" title="Templates Tables Ancestry Chart" />
      <page pageid="98" ns="0" title="Template Example Neverwinter Armour" />
      <page pageid="223" ns="0" title="Hârn Paper Scale Measurements" />
      <page pageid="352" ns="0" title="Game Design Ideas Measurements Metrics in Drafting" />
    </pages>
  </query>
</api>