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="Getting_Started" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="50" ns="0" title="Connecting to the Alarm Panel" />
      <p pageid="40" ns="0" title="Connection Types" />
      <p pageid="39" ns="0" title="Create an Account" />
      <p pageid="49" ns="0" title="Credits" />
      <p pageid="38" ns="0" title="DLS Web SA Home Page" />
      <p pageid="35" ns="0" title="DLS Web SA Home Screen" />
      <p pageid="142" ns="0" title="DLS Workgroup Add-On Web SA INT" />
      <p pageid="141" ns="0" title="DLS Workgroup Add-On Web SA NA" />
      <p pageid="2" ns="0" title="DSC Software EULA" />
      <p pageid="41" ns="0" title="Frequently Asked Questions" />
    </allpages>
  </query>
</api>