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="BASIC/UNO_Object_Browser|15814" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2267" ns="0" title="Extensions development basic" />
      <page pageid="2574" ns="0" title="Summer of Code 2006" />
      <page pageid="2990" ns="0" title="Constructing Components" />
      <page pageid="3030" ns="0" title="IDL Files and Cpp" />
      <page pageid="3380" ns="0" title="Architecture" />
      <page pageid="3759" ns="0" title="General UNO Component Project Type" />
      <page pageid="3807" ns="0" title="Extensions development basic fr" />
      <page pageid="6594" ns="0" title="Developers FAQ" />
      <page pageid="15807" ns="0" title="FR/Documentation/Fichiers IDL et C++" />
      <page pageid="22583" ns="2" title="User:Foral/JA/Documentation/List" />
    </pages>
  </query>
</api>