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="AnnaBattenhouse150x150.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="87" ns="6" title="File:Aashiq profile.jpg" />
      <page pageid="177" ns="6" title="File:Abardo.jpg" />
      <page pageid="60" ns="6" title="File:Abardo profile.jpg" />
      <page pageid="182" ns="6" title="File:Alex.jpg" />
      <page pageid="22" ns="6" title="File:Alice profile.jpg" />
      <page pageid="46" ns="6" title="File:Alisha profile.jpg" />
      <page pageid="109" ns="6" title="File:Amount of RNAseq.2013feb.jpg" />
      <page pageid="183" ns="6" title="File:Andrew.jpg" />
      <page pageid="59" ns="6" title="File:Andrew profile.jpg" />
      <page pageid="180" ns="6" title="File:Anna.jpg" />
    </pages>
  </query>
</api>