RE: [wsrf] Clarification text for issue #24

["Jeff Bohren" <jbohren@opennetwork.com>]

Would that mean that for every reference to a QNamed element, the namespace-uri() function would be required?
 
Could you post an example of this for those of us who are not XPath gurus?
 
Jeff Bohren

	-----Original Message----- 
	From: Vambenepe, William N [mailto:vbp@hp.com] 
	Sent: Mon 10/18/2004 11:24 PM 
	To: wsrf@lists.oasis-open.org 
	Cc: 
	Subject: [wsrf] Clarification text for issue #24
	
	

	Hi all,
	
	I had an action item to propose clarification text for issue #24 as well
	as explaining how to write a "Safe" Xpath statement. I just noticed that
	Steve wrote such a clarification text for the benefit of the WSN TC so I
	will borrow from this and just add the Xpath example:
	
	<proposed addition>
	
	If the value of the Xpath statement contains QNames, then the namespace
	declarations that specify the mapping of the QName's prefix to an actual
	namespace URI can be found amongst any namespace declaration in scope
	for the element or attribute that contains the Xpath statement in its
	value.  Note: Some XML processors may modify the namespace declarations.
	Designers should be aware that such transforms exist and may render the
	expression incoherent, as it is likely the change in namespace
	declaration will not update a QName embedded within a string.
	
	The way to write a "safe" Xpath statement that is not subject to
	breaking when XML processors modify namespace prefixes is to test
	explicitly in the Xpath expression for local name and namespace, using
	the Xpath functions local-name() and namespace-uri().
	
	</proposed addition>
	
	Regards,
	
	William