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>
    <allpages apcontinue="BCAL_Beam_Tests_2012" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="16837" ns="0" title="B1pi monitoring dashboard schema" />
      <p pageid="6881" ns="0" title="B1pi tests Sep. 2011" />
      <p pageid="6880" ns="0" title="B1pi with GlueX Monte Carlo" />
      <p pageid="1575" ns="0" title="BCAL" />
      <p pageid="16239" ns="0" title="BCAL-Chiller.MPOD Interlock.jpg" />
      <p pageid="13849" ns="0" title="BCAL Action Items and Working Tasks" />
      <p pageid="1568" ns="0" title="BCAL Angular Coverage" />
      <p pageid="1608" ns="0" title="BCAL Beam Test Plots, November 20, 2006" />
      <p pageid="1373" ns="0" title="BCAL Beam Tests" />
      <p pageid="1570" ns="0" title="BCAL Beam Tests 2006 - Analysis" />
    </allpages>
  </query>
</api>