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="Beglanacademy.png|2849" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2980" ns="0" title="Bassdance Irish Dance School" />
      <page pageid="3390" ns="0" title="Irish Dance at Banana Broadway Dance Studio" />
      <page pageid="3428" ns="0" title="Bailey Murray Academy of Irish Dancing" />
      <page pageid="3471" ns="0" title="Bailey Scariff Academy of Irish Dancing" />
      <page pageid="3533" ns="0" title="Banbha Irish Dance School" />
      <page pageid="4126" ns="0" title="Barrett School of Irish Dancing" />
      <page pageid="4130" ns="0" title="Baxter School of Irish Dancing" />
      <page pageid="4172" ns="0" title="Bailie School of Irish Dancing" />
      <page pageid="4205" ns="0" title="Ballynafeigh School of Irish Dancing" />
      <page pageid="5183" ns="0" title="Barnsley Irish Dance Academy" />
    </pages>
  </query>
</api>