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="Logging" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1606" ns="0" title="Ban and exception lists" />
      <page pageid="1638" ns="0" title="Basic Server Settings" />
      <page pageid="1649" ns="0" title="Capture The Flag" />
      <page pageid="1709" ns="0" title="Compatibility Options" />
      <page pageid="1505" ns="0" title="Compiling the Launcher using Code::Blocks" />
      <page pageid="1286" ns="0" title="Compiling using Code::Blocks" />
      <page pageid="1480" ns="0" title="Compiling using Microsoft Visual Studio" />
      <page pageid="1380" ns="0" title="Development roadmap" />
      <page pageid="1627" ns="0" title="Ending Games" />
      <page pageid="1321" ns="0" title="Frequently Asked Questions" />
    </pages>
  </query>
</api>