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RE: [xsl] Re: XSLT 2.0: On xsl:sequence and xsl:copy-of


Subject: RE: [xsl] Re: XSLT 2.0: On xsl:sequence and xsl:copy-of
From: "Michael Kay" <mhk@xxxxxxxxx>
Date: Fri, 10 Oct 2003 23:06:30 +0100

> 
> Then a slight modification:
> 
>     <xsl:variable name="v1" as="item()*">
>       <xsl:sequence select="/"/>
>     </xsl:variable>
>     <xsl:variable name="v2"  as="item()*">
>       <xsl:sequence select="/"/>
>     </xsl:variable>
> 
>     <xsl:copy-of select="$v1 except $v2"/>
> 
> I guess this will not produce any output -- am I right?

Correct, this will be an empty sequence.
> 
> 
> My last question is the following:
> 
> In the example above the two sequences consist not of nodes, 
> but of *references to nodes*. This is a very useful new 
> datatype, not present in the XPath data model. Will it not be 
> nice to explain this in detail in the XSLT spec.?
> 

I must admit I like to think in terms of "references to nodes" rather
than "nodes" but for some reason this is not the language that the data
model uses. When it talks of a sequence "containing nodes", this is
clearly not exclusive containment, since the same node can belong to
more than one sequence. But that's the terminology that's used.

Michael Kay


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