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="Balling" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="1069" ns="0" title="BIAB" />
      <p pageid="1732" ns="0" title="BRY 97" />
      <p pageid="3458" ns="0" title="Baby Boomer Fashion - 6 Constructive Tips To Look Magnificent" />
      <p pageid="3550" ns="0" title="Back To School Apparel Shopping On An Allowance" />
      <p pageid="3009" ns="0" title="Bad Economy - Advertise Your Small Business Using Free Publicity" />
      <p pageid="3323" ns="0" title="Bad Economy - Promote Your Small Business Using Free Publicity" />
      <p pageid="1577" ns="0" title="Badkarskylning" />
      <p pageid="998" ns="0" title="Bajonettkoppling" />
      <p pageid="763" ns="0" title="Bakterie" />
      <p pageid="438" ns="0" title="Bakterier" />
    </allpages>
  </query>
</api>