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>
    <embeddedin geicontinue="10|Stub|24" />
  </query-continue>
  <query>
    <pages>
      <page pageid="12" ns="0" title="Decode File API" contentmodel="wikitext" pagelanguage="en" touched="2010-11-30T03:33:27Z" lastrevid="61451" counter="" length="1365" />
      <page pageid="15" ns="0" title="Application API" contentmodel="wikitext" pagelanguage="en" touched="2009-06-10T14:09:03Z" lastrevid="58852" counter="" length="316" />
      <page pageid="16" ns="0" title="File Reader Service" contentmodel="wikitext" pagelanguage="en" touched="2009-06-10T14:08:32Z" lastrevid="58851" counter="" length="54" />
      <page pageid="17" ns="0" title="Text Feed Service" contentmodel="wikitext" pagelanguage="en" touched="2009-06-10T14:08:25Z" lastrevid="58850" counter="" length="54" />
      <page pageid="18" ns="0" title="Image Loader Service" contentmodel="wikitext" pagelanguage="en" touched="2009-06-10T14:07:59Z" lastrevid="58849" counter="" length="53" />
      <page pageid="19" ns="0" title="Image Writer Service" contentmodel="wikitext" pagelanguage="en" touched="2009-06-10T14:07:50Z" lastrevid="58848" counter="" length="40" />
      <page pageid="20" ns="0" title="Memory Manager API" contentmodel="wikitext" pagelanguage="en" touched="2009-06-10T14:07:36Z" lastrevid="58847" counter="" length="301" />
      <page pageid="21" ns="0" title="Service Manager API" contentmodel="wikitext" pagelanguage="en" touched="2009-06-10T14:07:03Z" lastrevid="58846" counter="" length="34" />
      <page pageid="22" ns="0" title="Skin API" contentmodel="wikitext" pagelanguage="en" touched="2010-07-24T02:40:02Z" lastrevid="61299" counter="" length="83" />
      <page pageid="23" ns="0" title="System Callbacks API" contentmodel="wikitext" pagelanguage="en" touched="2009-06-10T14:06:48Z" lastrevid="58844" counter="" length="30" />
    </pages>
  </query>
</api>