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="Biking_Friday_20120420" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="722" ns="0" title="B2G - Gaia Hacking" />
      <p pageid="721" ns="0" title="B2G build server - Howto" />
      <p pageid="1780" ns="0" title="BackGarden design and build 01" />
      <p pageid="1275" ns="0" title="Backup and Restore" />
      <p pageid="705" ns="0" title="BattleMeshv5" />
      <p pageid="1249" ns="0" title="Beaglebone Black" />
      <p pageid="1114" ns="0" title="Beer Brewing 20120211" />
      <p pageid="1115" ns="0" title="Beer Brewing 20130407" />
      <p pageid="1540" ns="0" title="Bike Maintenance 101" />
      <p pageid="765" ns="0" title="Biking" />
    </allpages>
  </query>
</api>