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="CERN@school_and_CVMFS" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Background to batch system memory request for details:" missing="" />
      <page pageid="1631" ns="0" title="BDII" />
      <page pageid="1219" ns="0" title="Backing up postgreSQL databases" />
      <page pageid="3722" ns="0" title="Batch system status" />
      <page pageid="4215" ns="0" title="Benchmarking procedure" />
      <page pageid="1029" ns="0" title="Birmingham" />
      <page pageid="1031" ns="0" title="Bristol" />
      <page pageid="1130" ns="0" title="Bristol (10 Questions)" />
      <page pageid="995" ns="0" title="Brunel" />
      <page pageid="1439" ns="0" title="Building DPM" />
    </pages>
  </query>
</api>