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="Barcelona_Block|2048" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="16" ns="0" title="Textbook" />
      <page pageid="235" ns="0" title="Film List" />
      <page pageid="278" ns="0" title="UX Glossary" />
      <page pageid="954" ns="0" title="Terms to add" />
      <page pageid="1028" ns="0" title="Banff Summit on Living Architectures: Designing for Immersion and Interaction" />
      <page pageid="1524" ns="0" title="The Backspace Generation" />
      <page pageid="1601" ns="2" title="User:Caseorganic/Books/Dictionary" />
      <page pageid="2054" ns="0" title="Barcelona Block" />
    </pages>
  </query>
</api>