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="CaminoAlgorithms" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="BSplineRegistrationOV withMath.html" missing="" />
      <page pageid="321" ns="0" title="B-Spline Automatic Registration" />
      <page pageid="322" ns="0" title="B-Spline Automatic Registration Dialog box" />
      <page pageid="323" ns="0" title="BSpline registration: Detecting folding" />
      <page pageid="325" ns="0" title="Barrel Distortion Correction" />
      <page pageid="326" ns="0" title="Browsing DICOM images" />
      <page pageid="327" ns="0" title="Building and compiling plug-in programs" />
      <page pageid="328" ns="0" title="Calculating VOI statistics" />
      <page pageid="329" ns="0" title="Calculating statistics on VOI groups" />
      <page pageid="330" ns="0" title="Calculating the volume of masks" />
    </pages>
  </query>
</api>