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>
    <alllinks galcontinue="Background_Images_for_Version_6.0_(Portal)|3565" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1640" ns="0" title="Linking Tasks and Milestones (Adding, Deleting, Modifying) for Version 5.3" />
      <page pageid="1762" ns="0" title="Manual Editing for Version 5.3 (Portal)" />
      <page pageid="1912" ns="0" title="Manual Editing for OnePager Live (Portal)" />
      <page pageid="1922" ns="0" title="Linking Tasks and Milestones (Adding, Deleting, Modifying) for OnePager Live" />
      <page pageid="2043" ns="0" title="Managing the Current Template for OnePager Live" />
      <page pageid="2412" ns="0" title="OnePager Version 6.0" />
      <page pageid="2794" ns="0" title="Managing the Current Template for Version 6.0" />
      <page pageid="3053" ns="0" title="Manual Editing for Version 6.0 (Portal)" />
      <page pageid="3185" ns="0" title="Linking Tasks and Milestones (Adding, Deleting, Modifying) for Version 6.0" />
      <page pageid="3641" ns="0" title="Linking Tasks and Milestones (Adding, Deleting, Modifying) for OnePager Live Beta 2" />
    </pages>
  </query>
</api>