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>
    <allfileusages gafcontinue="Baltic.png|4556" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1912" ns="0" title="Final Report 2011: Who wrote the Letter to the Hebrews?" />
      <page pageid="2567" ns="0" title="Semester B Final Report 2013 - Secure communications without key exchange? 2013" />
      <page pageid="2610" ns="0" title="Timing Based Encryption: Test Case 1" />
      <page pageid="2614" ns="0" title="Timing Based Encryption: Test Case 2" />
      <page pageid="2619" ns="0" title="Timing Based Encryption: Test Case 3" />
      <page pageid="2807" ns="0" title="Semester B Final Report 2014 - Is secure communications possible?" />
      <page pageid="4740" ns="0" title="The ball bearing motor mystery 2022" />
    </pages>
  </query>
</api>