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="Drug_Price_Competition_and_Patent-Term_Restoration_Act" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Barcoding technology" missing="" />
      <page ns="0" title="Best Pharmaceuticals for Children Act" missing="" />
      <page ns="0" title="Dietary Supplements and Health Education Act" missing="" />
      <page pageid="277" ns="0" title="Barcoding technologies" />
      <page pageid="41" ns="0" title="Combat Methamphetamine Epidemic Act" />
      <page pageid="32" ns="0" title="Compounding" />
      <page pageid="23" ns="0" title="Comprehensive Drug Abuse Prevention and Control Act" />
      <page pageid="35" ns="0" title="Dietary Supplement Health and Education Act" />
      <page pageid="228" ns="0" title="Drug Addiction Treatment Act" />
      <page pageid="116" ns="0" title="Drug Enforcement Administration" />
    </pages>
  </query>
</api>