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>
    <allimages gaicontinue="AMO_radiator_Motor_GUI.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="107" ns="6" title="File:04.jpg" />
      <page pageid="13" ns="6" title="File:20140528 L3MonitoringArchitecture.png" />
      <page pageid="14" ns="6" title="File:20140528 L3MonitoringArchitecture noL3.png" />
      <page pageid="131" ns="6" title="File:20141021 CommissioningMonitoringArchitecture.png" />
      <page pageid="132" ns="6" title="File:20141021 hdmongui py.png" />
      <page pageid="227" ns="6" title="File:20160915 MonitoringArchitecture.jpg" />
      <page pageid="242" ns="6" title="File:20170126 hdview2.png" />
      <page pageid="240" ns="6" title="File:20170126 rootspy.png" />
      <page pageid="241" ns="6" title="File:20170126 rootspy reference.png" />
      <page pageid="299" ns="6" title="File:ACScreen.png" />
    </pages>
  </query>
</api>