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="CWagner.jpg|3941" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1892" ns="0" title="Team:Sydney Australia" />
      <page pageid="1903" ns="0" title="Team:Sydney Australia/Attributions" />
      <page pageid="2357" ns="0" title="Team:ETH Zurich/Design" />
      <page pageid="5055" ns="0" title="Team:Uniandes Colombia/Team" />
      <page pageid="5067" ns="0" title="Team:Uniandes Colombia/Practices" />
      <page pageid="5393" ns="0" title="Team:Goettingen/Experiments" />
      <page pageid="7438" ns="0" title="Team:SF Bay Area DIYBio/Description" />
      <page pageid="11559" ns="0" title="Team:UCLA/Notebook/Recombinant Expression/30 July 2015" />
      <page pageid="14173" ns="0" title="Team:UCLA/Notebook/Spider Silk Genetics/12 August 2015" />
      <page pageid="14176" ns="0" title="Team:UCLA/Notebook/Spider Silk Genetics/11 August 2015" />
    </pages>
  </query>
</api>