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>
    <allredirects garcontinue="Librenet|1883" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="146" ns="2" title="User:Hsgr" />
      <page pageid="1574" ns="0" title="Intro to Debian, pt 1." />
      <page pageid="1575" ns="0" title="Intro to the Debian project" />
      <page pageid="1667" ns="0" title="Fedora Weekend 2014" />
      <page pageid="1908" ns="0" title="Meeting" />
      <page pageid="1912" ns="0" title="Librenet" />
      <page pageid="1997" ns="0" title="Creative coding meetup" />
      <page pageid="2183" ns="0" title="WebOps" />
      <page pageid="2274" ns="0" title="DYI PCB" />
    </pages>
  </query>
</api>