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="13" ns="0" title="Bree" />
      <p pageid="14" ns="0" title="Caspian" />
      <p pageid="15" ns="0" title="Chief and the Dufflepuds" />
      <p pageid="16" ns="0" title="Chief and the dufflepuds" />
      <p pageid="21" ns="0" title="Coriakin" />
      <p pageid="22" ns="0" title="Corin" />
      <p pageid="24" ns="0" title="Digory Kirke" />
      <p pageid="25" ns="0" title="Doctor Cornelius" />
      <p pageid="23" ns="0" title="Drinian" />
      <p pageid="26" ns="0" title="Edmund Pevensie" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Emeth" />
  </query-continue>
</api>