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|375" />
  </query-continue>
  <query>
    <pages>
      <page pageid="9" ns="0" title="Chat HowTo" contentmodel="wikitext" pagelanguage="en" touched="2011-02-25T15:24:39Z" lastrevid="669" counter="123043" length="7222" />
      <page pageid="22" ns="0" title="Beginner" contentmodel="wikitext" pagelanguage="en" touched="2010-09-12T15:32:21Z" lastrevid="42" counter="30029" length="792" new="" />
      <page pageid="184" ns="0" title="Rewrite URL" contentmodel="wikitext" pagelanguage="en" touched="2011-02-19T13:02:19Z" lastrevid="618" counter="31422" length="1332" />
      <page pageid="344" ns="0" title="Css ABC for Contao" contentmodel="wikitext" pagelanguage="en" touched="2012-02-16T08:09:25Z" lastrevid="1312" counter="67900" length="6003" />
      <page pageid="347" ns="0" title="We need your Help!" contentmodel="wikitext" pagelanguage="en" touched="2011-07-17T12:27:38Z" lastrevid="890" counter="5314" length="65" new="" />
      <page pageid="357" ns="0" title="Back end Theme" contentmodel="wikitext" pagelanguage="en" touched="2011-08-24T03:00:53Z" lastrevid="906" counter="8239" length="349" />
      <page pageid="363" ns="0" title="Leads" contentmodel="wikitext" pagelanguage="en" touched="2012-04-29T09:26:40Z" lastrevid="1463" counter="20432" length="1872" />
      <page pageid="367" ns="0" title="Contao.Dev ExtensionsBrowserUpdate" contentmodel="wikitext" pagelanguage="en" touched="2011-12-15T10:41:19Z" lastrevid="950" counter="9939" length="1819" />
      <page pageid="373" ns="0" title="Contao.Dev ExtensionsBoxen" contentmodel="wikitext" pagelanguage="en" touched="2011-12-19T10:04:16Z" lastrevid="956" counter="6698" length="6762" new="" />
      <page pageid="374" ns="0" title="Contao.Dev WikiIncomplete" contentmodel="wikitext" pagelanguage="en" touched="2011-12-19T13:31:25Z" lastrevid="958" counter="5546" length="1134" />
    </pages>
  </query>
</api>