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="108" ns="0" title="Ban Moderation" />
      <p pageid="373" ns="0" title="Ban Moderation/pt" />
      <p pageid="281" ns="0" title="Ban Moderation/ru" />
      <p pageid="192" ns="0" title="Banning Guidelines" />
      <p pageid="374" ns="0" title="Banning Guidelines/pt" />
      <p pageid="280" ns="0" title="Banning Guidelines/ru" />
      <p pageid="114" ns="0" title="Buildings" />
      <p pageid="310" ns="0" title="Bắt đầu nhanh" />
      <p pageid="360" ns="0" title="Características lineares" />
      <p pageid="120" ns="0" title="Categories" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Codex UA" />
  </query-continue>
</api>