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="Azimuthsc.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="46759" ns="6" title="File:About tab.png" />
      <page pageid="80" ns="6" title="File:Adobe.png" />
      <page pageid="162" ns="6" title="File:Alpha xml1.png" />
      <page pageid="163" ns="6" title="File:Alpha xml2.png" />
      <page pageid="164" ns="6" title="File:Alpha xml3.png" />
      <page pageid="165" ns="6" title="File:Alpha xml4.png" />
      <page pageid="168" ns="6" title="File:Animlayer graphics.png" />
      <page pageid="169" ns="6" title="File:Animlayer xml1.png" />
      <page pageid="170" ns="6" title="File:Animlayer xml2.png" />
      <page pageid="60" ns="6" title="File:Avs.gif" />
    </pages>
  </query>
</api>