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"?>
    <allredirects garcontinue="Purchasing_CCTV|29" />
      <page pageid="23" ns="0" title="Basic Design Service" />
      <page pageid="172" ns="0" title="Contact" />
      <page pageid="224" ns="0" title="Equipment" />
      <page pageid="479" ns="0" title="Data Protection Act Compliant Documentation" />
      <page pageid="520" ns="0" title="Renewable Energy CCTV" />
      <page pageid="526" ns="0" title="Introduction" />
      <page pageid="547" ns="0" title="Data Protecton Act Compliant Signage" />
      <page pageid="651" ns="0" title="Sample Chapter: 4 Lenses" />
      <page pageid="671" ns="0" title="Installing CCTV" />
      <page pageid="683" ns="0" title="Sample Chapter: 14 Light and illumination" />