You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <allpages>
      <p pageid="351" ns="0" title="Backwardly Compatible Code (Activity)" />
      <p pageid="168" ns="0" title="Benthall - Open Collaboration (Proposal)" />
      <p pageid="374" ns="0" title="Bio of a FOSS Person (Activity)" />
      <p pageid="947" ns="0" title="Blockly Project" />
      <p pageid="66" ns="0" title="Blog Activity" />
      <p pageid="342" ns="0" title="Blog and Infographic Project (Activity)" />
      <p pageid="459" ns="0" title="Buffardi - Graduate SE (Proposal)" />
      <p pageid="370" ns="0" title="Bug Gardening" />
      <p pageid="610" ns="0" title="Bug Selection" />
      <p pageid="175" ns="0" title="Bug Tracker Activity-MouseTrap" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Bui, Rebelsky - IRC in the Curriculum (Proposal)" />
  </query-continue>
</api>