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="Bark_Lake_Fonds_at_Trent_University" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="2487" ns="0" title="Back to the Future" />
      <p pageid="3344" ns="0" title="Backpack of Tools for EML" />
      <p pageid="2016" ns="0" title="Balfour Report" />
      <p pageid="1748" ns="0" title="Bank Machine" />
      <p pageid="1852" ns="0" title="Bank Routing Number" />
      <p pageid="1889" ns="0" title="Bank of Canada Glossary" />
      <p pageid="1410" ns="0" title="Barack Obama" />
      <p pageid="3175" ns="0" title="Barbecue" />
      <p pageid="1779" ns="0" title="Bark Lake" />
      <p pageid="2995" ns="0" title="Bark Lake 1970s" />
    </allpages>
  </query>
</api>