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="Betty_wellinton_nursing.jpg|972" />
  </query-continue>
  <query>
    <pages>
      <page pageid="83" ns="0" title="Grace Annie Hight Benson (2)" />
      <page pageid="85" ns="0" title="Grace Annie Hight Benson (3)" />
      <page pageid="88" ns="0" title="Grace Annie Hight Benson (4)" />
      <page pageid="89" ns="0" title="Grace Annie Hight Benson (5)" />
      <page pageid="131" ns="0" title="Beryl Jane Hughes v2" />
      <page pageid="232" ns="0" title="Beryl Jane Hughes" />
      <page pageid="594" ns="0" title="Beverley Rayna" />
      <page pageid="972" ns="0" title="Margaret Williamson" />
      <page pageid="1008" ns="0" title="Steph Parker" />
    </pages>
  </query>
</api>