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Re: Cannot use a parameter value in the group-startin

Subject: Re: Cannot use a parameter value in the group-starting-with attribute?
From: David Carlisle <davidc@xxxxxxxxx>
Date: Fri, 14 May 2010 21:07:27 +0100
Re:  Cannot use a parameter value in the  group-startin
On 14/05/2010 20:49, Peter Desjardins wrote:
Hi. I'm writing a 2.0 stylesheet and my processor is Saxon HE 9.2.1.1.
Also, I'm just starting out with XSLT.

I am trying to create a template with parameters that will use the
for-each-group element. I find that I cannot use a parameter value in
the group-starting-with attribute.

There are two problems there, one is that patterns use a restricted syntax compared to xpath, but more importantly parameters and variables in xpath hold _values_ (as they would in c or fortran) not fragments of syntax 9as they would in a shell scripting language)


so when you go <xsl:with-param name="starting-element" select = "h1" />

the parameter does not hold the fragment of a pattern "h1" it holds the result of ebaluating teh expression h1 at that point, which is a possibly empty sequence of h1 nodes.

the this works

<xsl:for-each select = "$starting-element">

but it is not (at that point) selecting h1 elements it is simply iterating over the list of elements that has already been selected and stored in the $starting-element variable.

but this could not work even if it were not a syntax error

<xsl:for-each-group select = "*" group-starting-with = "$starting-element">

the grouping attributes need to take patterns or expressions used to filter the nodes selected, not take a sequence of nodes.

so do not pass in a sequence of nodes, pass in a string:

<xsl:with-param name="starting-element" select = "'h1'" />

(note the extra quotes(

then you can use that string in a pattern


<xsl:for-each-group select = "*" group-starting-with = "*[name()=$starting-element]">


David


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