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="Coordinate_system" />
      <page ns="0" title="CAD Concepts" missing="" />
      <page ns="0" title="Conic curve support" missing="" />
      <page pageid="238" ns="0" title="Blocks" />
      <page pageid="302" ns="0" title="Build from source" />
      <page pageid="6" ns="0" title="CAD" />
      <page pageid="638" ns="0" title="Calculator" />
      <page pageid="248" ns="0" title="Commands" />
      <page pageid="629" ns="0" title="Commands and tools" />
      <page pageid="628" ns="0" title="Commands and tools - using the command line" />
      <page pageid="8" ns="0" title="Contributors" />