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="2C-E.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2094" ns="6" title="Fil:02-sibirisk hjartstilla preflower.jpg" />
      <page pageid="2177" ns="6" title="Fil:100 1673.JPG" />
      <page pageid="2178" ns="6" title="Fil:100 1675.JPG" />
      <page pageid="2179" ns="6" title="Fil:100 1678.JPG" />
      <page pageid="2180" ns="6" title="Fil:100 1680.JPG" />
      <page pageid="2181" ns="6" title="Fil:100 1681.JPG" />
      <page pageid="2280" ns="6" title="Fil:140px-Methyltryptamine.png" />
      <page pageid="2526" ns="6" title="Fil:20100914 5 2.jpg" />
      <page pageid="1735" ns="6" title="Fil:2C-B-powder.jpg" />
      <page pageid="1793" ns="6" title="Fil:2C-C.png" />
    </pages>
  </query>
</api>