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>
    <allpages apcontinue="Distributed_Recording" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="249" ns="0" title="Background" />
      <p pageid="87" ns="0" title="Batch Processing" />
      <p pageid="148" ns="0" title="Calibration Definition" />
      <p pageid="565" ns="0" title="Calibration Definition AI" />
      <p pageid="81" ns="0" title="Cameras and Accessories" />
      <p pageid="57" ns="0" title="Changes in Price and Licensing" />
      <p pageid="354" ns="0" title="Checking Sensor Calibration for Depth Sensors" />
      <p pageid="168" ns="0" title="Create Multicamera Action Project" />
      <p pageid="169" ns="0" title="Create Single Depth Sensor Action Project" />
      <p pageid="70" ns="0" title="Depth Sensors Comparison" />
    </allpages>
  </query>
</api>