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"?>
    <allimages gaicontinue="ArUcoTag_WithCoordinateSystem.png" />
      <page pageid="67" ns="6" title="File:AX-01 Bearing Box type a reference frame.jpg" />
      <page pageid="68" ns="6" title="File:AX-01 Bearing Box type b reference frame.jpg" />
      <page pageid="69" ns="6" title="File:AX-02 Bearing reference frame.jpg" />
      <page pageid="70" ns="6" title="File:AX-03 Axis reference frame.jpg" />
      <page pageid="71" ns="6" title="File:AX-09 Motor with Gearbox reference frame.jpg" />
      <page pageid="50" ns="6" title="File:AX Parts Collection PM.png" />
      <page pageid="49" ns="6" title="File:AX Parts Collection small.jpg" />
      <page pageid="57" ns="6" title="File:Aid tray rack.jpg" />
      <page pageid="130" ns="6" title="File:All objects.png" />
      <page pageid="126" ns="6" title="File:AlvarTag WithCoordinateSystem.png" />