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>
    <allfileusages gafcontinue="S&amp;D-Kendal_Multiview_Market.jpg|198" />
  </query-continue>
  <query>
    <pages>
      <page pageid="3" ns="0" title="Gillinggate" />
      <page pageid="32" ns="0" title="Rose and Crown Inn" />
      <page pageid="65" ns="0" title="Yard 23 Kirkland" />
      <page pageid="84" ns="0" title="Finkle Street" />
      <page pageid="167" ns="0" title="Greenside" />
      <page pageid="198" ns="0" title="Dowker&#039;s Hospital" />
      <page pageid="222" ns="0" title="Kings Arms Inn" />
      <page pageid="276" ns="0" title="Camm&#039;s Yard 89 Stricklandgate" />
      <page pageid="298" ns="0" title="53 Stricklandgate" />
    </pages>
  </query>
</api>