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>
    <allpages apcontinue="COMP345_-_fall_2021" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="150" ns="0" title="Build-and-fix model" />
      <p pageid="53" ns="0" title="COMP248 - winter 2006" />
      <p pageid="5" ns="0" title="COMP345 - fall 2013" />
      <p pageid="240" ns="0" title="COMP345 - fall 2014" />
      <p pageid="333" ns="0" title="COMP345 - fall 2015" />
      <p pageid="375" ns="0" title="COMP345 - fall 2016" />
      <p pageid="412" ns="0" title="COMP345 - fall 2017" />
      <p pageid="482" ns="0" title="COMP345 - fall 2018" />
      <p pageid="545" ns="0" title="COMP345 - fall 2019" />
      <p pageid="625" ns="0" title="COMP345 - fall 2020" />
    </allpages>
  </query>
</api>