verifyLinkedContent of XML page

"MARCHAND Guillaume" <[email protected]>
Newsgroups gmane.comp.web.canoo.webtest
Message-ID <04CD01A2981BC04E84E164811EABCC6F03BF2168@FRCP0021.cpgrp.root.local> 
Hi 

I would want to verify the availability of the Images linked from my XML Webservice http://service.canal-plus.com/video/rest/getVideosLiees/cplus/412398


So I use this step 
<verifyLinkedContent description="verify image content" xpath="/VIDEOS/VIDEO[1]/MEDIA/IMAGES/PETIT"/>


But It doesn't seem to work, Have you got any suggestions ?

Error 
Message
Current response is not an html page but class com.gargoylesoftware.htmlunit.xml.XmlPage
Current response
http://service.canal-plus.com/video/rest/getVideosLiees/cplus/412398

Thxs

Guillaume
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