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="Workflow_1.png|1049" />
  </query-continue>
  <query>
    <pages>
      <page pageid="8" ns="0" title="Plan face-to-face kickoff meeting" />
      <page pageid="1048" ns="0" title="Make data accessible by Ibrahim Demir" />
      <page pageid="1069" ns="0" title="Document provenance of results by Suzanne Pierce" />
      <page pageid="1098" ns="0" title="Make data accessible by Xuan Yu" />
      <page pageid="1099" ns="0" title="Document provenance of results by Xuan Yu" />
      <page pageid="1156" ns="0" title="Quick Guide to Using a Wiki" />
      <page pageid="1276" ns="0" title="Develop GPF Checklist" />
    </pages>
  </query>
</api>