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="Chem2.jpg|33" />
  </query-continue>
  <query>
    <pages>
      <page pageid="7" ns="0" title="Badlands Rifle" />
      <page pageid="33" ns="0" title="Gathering" />
      <page pageid="90" ns="0" title="CNC Mill" />
      <page pageid="107" ns="0" title="Battery" />
      <page pageid="108" ns="0" title="Battery Charger" />
      <page pageid="160" ns="0" title="Buckshot Ammo" />
      <page pageid="182" ns="0" title="Can O&#039; Beans" />
      <page pageid="192" ns="0" title="Well-cooked Beans" />
      <page pageid="278" ns="0" title="Orange Liqueur" />
      <page pageid="282" ns="0" title="Pet Birds" />
    </pages>
  </query>
</api>