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="Information|4664" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4664" ns="0" title="Quest Mile-Senior high City Funeral Memorials" />
      <page pageid="5588" ns="0" title="Quest Majuscule of Colorado Funeral Memorials" />
      <page pageid="10008" ns="0" title="Small Business What Tools Do You Desire" />
      <page pageid="10368" ns="0" title="Digital Marketing Tools: 5 Modern Ways to Advertise Your Small Business" />
      <page pageid="20519" ns="0" title="Small Business Books You Should Check" />
    </pages>
  </query>
</api>