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="321" ns="0" title="B018 SF. Siemensstadt" />
      <p pageid="223" ns="0" title="B01 Eckbauer" />
      <p pageid="215" ns="0" title="B02 Kreuzberg" />
      <p pageid="255" ns="0" title="B15 Zehlendorf" />
      <p pageid="356" ns="0" title="B16 Rehberge" />
      <p pageid="204" ns="0" title="B18 Siemensstadt" />
      <p pageid="312" ns="0" title="B20 Schwarz-Weiß Neukölln" />
      <p pageid="335" ns="0" title="B24 Rehberge" />
      <p pageid="207" ns="0" title="B36 Lichtenrade" />
      <p pageid="214" ns="0" title="B52 Berolina" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="B66 Narva" />
  </query-continue>
</api>