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="Lamp_tavern_ls.jpg|44" />
  </query-continue>
  <query>
    <pages>
      <page pageid="27" ns="0" title="The Greenhouse Ty Gwydr (Venues UK Wales)" />
      <page pageid="31" ns="0" title="The Gregson Community &amp; Arts Centre (Venues UK NW England)" />
      <page pageid="38" ns="0" title="Cafe Ort (Venues UK Midlands)" />
      <page pageid="40" ns="0" title="Hare and hounds (Venues UK Midlands)" />
      <page pageid="51" ns="0" title="Royal Birmingham Conservatoire, The" />
      <page pageid="53" ns="0" title="Eagle Inn ( Venue UK Manchester )" />
      <page pageid="65" ns="0" title="Template UK Improviser personal page" />
      <page pageid="69" ns="0" title="Ear cleaning" />
      <page pageid="76" ns="0" title="Club db Bangor" />
      <page pageid="146" ns="0" title="System 50:50 for improvisers" />
    </pages>
  </query>
</api>