The official answer is using function-available(). 

But you could try a solution that uses entities: replace the
xx:node-set(expr) by &xx-node-set;(expr), and use EntityResolvers,
catalogs, etc, to expand the xx-node-set entity reference differently on
different occasions.

Michael Kay 

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx 
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Abie Hamaoui
> Sent: 08 October 2003 17:57
> To: XSL-List@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  using node-set() extension function across vendors
> 
> 
> hello again all,
> I have a stylesheet that I want to be able to run using saxon 
> (ver.6.5/xsl-ver.1.1) and msxsl (ver.3/xsl-ver.1.0).  I want 
> to be able to 
> create variables to use as regular trees.
> 
> both vendors have a node-set() extension function, but the 
> problem is that 
> they use dif't namespaces:
> msxsl:node-set() and saxon:node-set().
> 
> is there a way to define a namespace prefix <<extra>> that 
> will take on 
> dif't namespace uri's depending on a test, eg 
> "urn:schemas-microsoft-com:xslt" or "http://icl.com/saxon" 
> depending on a 
> check of system-property()?
> 
> (I think I could just test for 
> function-available(msxsl:node-set) each time, 
> or the like, but it seems more elegant to make this 
> determination just 
> once.)
> 
> thanks in advance.
> abie
> 
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