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="Saxony" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="81" ns="0" title="Barnevelder" />
      <p pageid="84" ns="0" title="Belgian Bantam" />
      <p pageid="5" ns="0" title="Chicken Breeds" />
      <p pageid="6" ns="0" title="Chicken Breeds Chart" />
      <p pageid="395" ns="0" title="Contact Backyard Poultry Administration" />
      <p pageid="7" ns="0" title="Duck Breeds" />
      <p pageid="441" ns="0" title="Duck Breeds Chart" />
      <p pageid="8" ns="0" title="Goose Breeds" />
      <p pageid="9" ns="0" title="Guinea Fowl" />
      <p pageid="1" ns="0" title="Main Page" />
    </allpages>
  </query>
</api>