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"?>
    <alllinks galcontinue="Batch_Rendering|2156" />
      <page pageid="1725" ns="0" title="APP/APG v2.0 Main Window" />
      <page pageid="1731" ns="10" title="Template:Option Detection" />
      <page pageid="1807" ns="0" title="APP/APG v2.0 Icons and Shortcuts" />
      <page pageid="1955" ns="0" title="Example Workflow" />
      <page pageid="1997" ns="0" title="V1.3 - Main Window" />
      <page pageid="1999" ns="0" title="V1.3 - Panoramas View" />
      <page pageid="2000" ns="0" title="V1.3 - Application Settings" />
      <page pageid="2008" ns="0" title="V1.3 - Icons and Shortcuts" />
      <page pageid="2276" ns="0" title="Old doc" />
      <page pageid="3393" ns="0" title="Projects and Community" />