You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
Please see "format" parameter documentation at the API help for more information. 
<?xml version="1.0" encoding="utf-8"?>
<api>
  <query-continue>
    <allpages apfrom="Data Streams Track--The 25nd Annual ACM Symposium on Applied Computing, Lausanne, Switzerland, March 22 - 26, 2010" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="10" ns="0" title="CS&E Education Panel, March 4, 2009" />
      <p pageid="6" ns="0" title="CS&E Graduate Education" />
      <p pageid="47" ns="0" title="CS&E Postgraduate Education" />
      <p pageid="8" ns="0" title="CSE09" />
      <p pageid="76" ns="0" title="CSE11" />
      <p pageid="74" ns="0" title="CSE11 Business Meeting" />
      <p pageid="66" ns="0" title="Call for Papers: 18th Annual High Performance Computing Symposium (HPC 2010), Papers Due: December 4 2009" />
      <p pageid="51" ns="0" title="Career Opportunities" />
      <p pageid="42" ns="0" title="Computational Science and Engineering at the University of New Mexico" />
      <p pageid="31" ns="0" title="Current events" />
    </allpages>
  </query>
</api>