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>
    <allfileusages gafcontinue="Coords_Antenna_position_wiki_fig1.gif|104" />
  </query-continue>
  <query>
    <pages>
      <page pageid="7" ns="0" title="Total Power Calibration" />
      <page pageid="83" ns="0" title="Calibrator Survey" />
      <page pageid="141" ns="0" title="2017 April" />
      <page pageid="148" ns="0" title="Reference Gain Calibration" />
      <page pageid="213" ns="0" title="VLA Data Survey" />
      <page pageid="353" ns="0" title="GSFITVIEW Help" />
      <page pageid="354" ns="0" title="GSFIT Help" />
    </pages>
  </query>
</api>