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>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <links>
          <pl ns="0" title="Binary Search Trees" />
          <pl ns="0" title="Document Distance" />
          <pl ns="0" title="Lectures and Recitations" />
          <pl ns="0" title="Problem Sets" />
          <pl ns="0" title="Python-mode for Emacs on Athena" />
          <pl ns="0" title="Python Cost Model" />
          <pl ns="0" title="Quizzes" />
        </links>
      </page>
    </pages>
  </query>
</api>