You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allpages apcontinue="Diana_Stuart-Masters" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="232" ns="0" title="Beryl Jane Hughes" />
      <p pageid="61" ns="0" title="Beryl Jane Hughes (2)" />
      <p pageid="131" ns="0" title="Beryl Jane Hughes v2" />
      <p pageid="594" ns="0" title="Beverley Rayna" />
      <p pageid="306" ns="0" title="Claire Birss" />
      <p pageid="9" ns="0" title="Contribute" />
      <p pageid="650" ns="0" title="Daryle Deering" />
      <p pageid="172" ns="0" title="Dawne McPhee" />
      <p pageid="579" ns="0" title="Denise Harger" />
      <p pageid="184" ns="0" title="Diana Grant-Mackie" />
    </allpages>
  </query>
</api>