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>
    <alllinks galcontinue="Healthcare_Financial_Management_Association|149" />
  </query-continue>
  <query>
    <pages>
      <page pageid="7" ns="0" title="Medical Billing Wiki" />
      <page pageid="20" ns="0" title="American Health Information Management Association" />
      <page pageid="86" ns="0" title="CCS-P" />
      <page pageid="97" ns="0" title="Clearinghouse" />
      <page pageid="109" ns="0" title="Outsource Management Group, LLC." />
      <page pageid="137" ns="0" title="American Medical Association" />
      <page pageid="140" ns="0" title="HEALTH INSURANCE PORTABILITY AND ACCOUNTABILITY ACT" />
      <page pageid="142" ns="0" title="Code Set" />
      <page pageid="145" ns="0" title="HFMA" />
      <page pageid="168" ns="0" title="ADMINISTRATIVE SIMPLIFICATION COMPLIANCE ACT" />
    </pages>
  </query>
</api>