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="BJCP|1553" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1538" ns="0" title="Pilsner" />
      <page pageid="1540" ns="0" title="Amber Ale" />
      <page pageid="1542" ns="0" title="American Pale Ale" />
      <page pageid="1543" ns="0" title="California Common" />
      <page pageid="1546" ns="0" title="Dry Stout" />
      <page pageid="1548" ns="0" title="Blonde Ale" />
      <page pageid="1549" ns="0" title="Biere de Garde" />
      <page pageid="1550" ns="0" title="Berliner Weisse" />
      <page pageid="1551" ns="0" title="Baltic Porter" />
      <page pageid="1552" ns="0" title="Irish Red Ale" />
    </pages>
  </query>
</api>