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"?>
<api>
  <query-continue>
    <alllinks galcontinue="BSplineRegistrationOV_withMath.html|374" />
  </query-continue>
  <query>
    <pages>
      <page pageid="6" ns="0" title="Supported algorithms" />
      <page pageid="322" ns="0" title="B-Spline Automatic Registration Dialog box" />
      <page pageid="323" ns="0" title="BSpline registration: Detecting folding" />
      <page pageid="374" ns="0" title="Examples of BSpline registration" />
      <page pageid="429" ns="0" title="Interpolation methods used in MIPAV" />
      <page pageid="529" ns="0" title="User Dialogs in MIPAV" />
      <page pageid="530" ns="0" title="Using MIPAV Algorithms" />
      <page pageid="556" ns="0" title="Wiki help testing" />
      <page pageid="2816" ns="0" title="MIPAV Help" />
    </pages>
  </query>
</api>