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="Communicating-Your-Teenager-About-Adoption.jpg|6717" />
  </query-continue>
  <query>
    <pages>
      <page pageid="652" ns="0" title="Special Needs" />
      <page pageid="1134" ns="0" title="Miscarriage" />
      <page pageid="1145" ns="0" title="Pregnancy" />
      <page pageid="1147" ns="0" title="Pregnancy Complications" />
      <page pageid="5779" ns="0" title="Pregnancy Lifestyle Changes" />
      <page pageid="6275" ns="0" title="Common Pregnancy Complaints" />
      <page pageid="6613" ns="0" title="Adoption Parenting: Teenage Years" />
      <page pageid="6831" ns="0" title="Teenage Years: Understanding Teenage Development and the Impact of Adoption" />
    </pages>
  </query>
</api>