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="15" ns="0" title="Bibliotheques et dependances" />
      <p pageid="395" ns="0" title="Boost Your Internet Site s Ranking With GSA Online Search Engine Ranker" />
      <p pageid="261" ns="0" title="Boost Your Online Existence With GSA Online Search Engine Ranker" />
      <p pageid="276" ns="0" title="Boost Your Online Existence With GSA Search Engine Ranker" />
      <p pageid="225" ns="0" title="Boost Your Online Presence With GSA Internet Search Engine Ranker" />
      <p pageid="372" ns="0" title="Boost Your Online Presence With GSA Online Search Engine Ranker" />
      <p pageid="207" ns="0" title="Boost Your Online Presence With GSA Search Engine Ranker" />
      <p pageid="374" ns="0" title="Boost Your Online Visibility With GSA Online Search Engine Ranker" />
      <p pageid="327" ns="0" title="Boost Your Online Visibility With GSA Search Engine Ranker" />
      <p pageid="378" ns="0" title="Boost Your Site s Exposure With The GSA Search Engine Ranker" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Boost Your Site s Rank With GSA Internet Search Engine Ranker" />
  </query-continue>
</api>