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="Angiosperm_phylogeny_2010.pdf" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2290" ns="6" title="File:2011 Ecard Almond.jpg" />
      <page pageid="2291" ns="6" title="File:2011 Ecard Amla.jpg" />
      <page pageid="2292" ns="6" title="File:2011 Ecard Eucalyptus.jpg" />
      <page pageid="2293" ns="6" title="File:2011 Ecard Saffron.jpg" />
      <page pageid="1764" ns="6" title="File:500px-Status iucn3.1.png" />
      <page pageid="671" ns="6" title="File:548px-Tulsi flowers pods brahma.jpg" />
      <page pageid="672" ns="6" title="File:800px-Himalaya-Zeder-Zapfen brahma.jpg" />
      <page pageid="668" ns="6" title="File:ARS ginger brahma.jpg">
        <duplicatefiles>
          <df name="ARS_ginger.jpg" user="AlbertCahalan~commonswiki" timestamp="2005-05-05T17:12:52Z" shared="" />
        </duplicatefiles>
      </page>
      <page pageid="2440" ns="6" title="File:Amblacheri bull.jpg" />
      <page pageid="2431" ns="6" title="File:Amrit Mahal.jpg" />
    </pages>
  </query>
</api>