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="Creating_a_new_category_display_page" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="70" ns="0" title="Change star rating images" />
      <p pageid="240" ns="0" title="Change star rating images - AC Gold" />
      <p pageid="85" ns="0" title="Changing additional pictures display on mouse over" />
      <p pageid="59" ns="0" title="Code for Alert when there are reviews to approve" />
      <p pageid="251" ns="0" title="Code for Alert when there are reviews to approve - AC Gold" />
      <p pageid="32" ns="0" title="CommerceBuilder API" />
      <p pageid="38" ns="0" title="Creating A Custom Feed Provider" />
      <p pageid="36" ns="0" title="Creating Digital Delivery Licensing Module" />
      <p pageid="15" ns="0" title="Creating Themes" />
      <p pageid="238" ns="0" title="Creating Themes - AC Gold" />
    </allpages>
  </query>
</api>