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="Computer_system_guide" />
      <page ns="0" title="Bracketed panorama" missing="" />
      <page pageid="2155" ns="0" title="Bashfuse" />
      <page pageid="2902" ns="0" title="Batch Rendering" />
      <page pageid="3365" ns="0" title="Bracket : Using Stacks" />
      <page pageid="6222" ns="0" title="Bracket : Using Stacks - 370" />
      <page pageid="2863" ns="0" title="Central window" />
      <page pageid="2886" ns="0" title="Clauss" />
      <page pageid="2893" ns="0" title="Color and Brightness" />
      <page pageid="1863" ns="0" title="Color and brightness" />
      <page pageid="2124" ns="0" title="Color matching images in a panorama" />