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RE: Re: Identity transformation for XSLT 2.0

Subject: RE: Re: Identity transformation for XSLT 2.0
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Sun, 23 Dec 2007 18:56:13 -0000
RE:  Re: Identity transformation for XSLT 2.0
> I recently needed to do set difference operation in a 2.0 
> stylesheet, using Saxon 9 (basic version). I was a bit 
> surprised to find that Saxon reported, "Unknown system 
> function except()".
> 
> The F&O spec defines this function
> (http://www.w3.org/TR/xquery-operators/#func-except). Could 
> you please tell, why this built in function not implemented 
> in Saxon 9.

It's not a function, it's an operator. (Note the op: prefix). You can write
"A except B".
> 
> As a workaround, I had to resort to $seq1[not(. = $seq2)] ...
> 

That doesn't do the same thing, it compares by value, not by node identity. 

Michael Kay
http://www.saxonica.com/

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