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="BCAL|3540" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="1383" ns="0" title="Charged Particle Tracking" />
      <page pageid="2765" ns="0" title="Calorimeter Review" />
      <page pageid="3475" ns="0" title="Oct 13, 2008 Calorimetry" />
      <page pageid="3519" ns="0" title="Oct 27, 2008 Calorimetry" />
      <page pageid="3522" ns="0" title="Nov 10, 2008 Calorimetry" />
      <page pageid="6840" ns="0" title="GlueX Offline Meeting, September 7, 2011" />
      <page pageid="6880" ns="0" title="B1pi with GlueX Monte Carlo" />
      <page pageid="10943" ns="0" title="Old Physics Analysis" />
      <page pageid="11953" ns="2" title="User:Sdobbs" />
    </pages>
  </query>
</api>