RE: Another Grouping question

$next-marker is a node, not a number, so comparing it with position() isn't
going to be useful.

You can use this approach in XSLT 2.0, where you would write

following-sibling::*[. << $next-marker]

but of course XPath 1.0 doesn't have the "<<" operator.

The usual way of tackling this in 1.0 is

<xsl:variable name="this" select="generate-id()"/>
<xsl:for-each
select="following-sibling::*[generate-id(preceding-sibling::marker[1])=$this
]">

that is, select all the following siblings whose first preceding marker is
the node you started at.

A recursive scan of the siblings is likely to be more efficient if there are
many of them.

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

> -----Original Message-----
> From: Paul Clarke [mailto:pclarke@xxxxxxxxxxxxxxxx] 
> Sent: 17 February 2005 12:07
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Another Grouping question
> 
> Hello,
> 
> Thank you to those who responded to my previous question.
> 
> I now realise that the key to a lot of my current problems 
> are to create the
> correct groupings.
> 
> Before coming back to the list I spent a lot of time reading 
> Michael Kay's
> Programmer Reference but I'm still struggling with 
> constructing the correct
> predictate.
> 
> I have the following XML:
> 
> <frag>
> 	<p/>
> 	<p/>
> 	<table/>
> 	<list/>
> 	<marker/>
> 	<p/>
> 	<p/>
> 	<p/>
> 	<p/>
> 	<table/>
> 	<p/>
> 	<p/>
> 	<table/>
> 	<list/>
> 	<marker/>
> 	<p/>
> 	<p/>
> 	<table/>
> 	<list/>
> </frag>
> 
> I need to create a grouping that selects a marker element 
> followed by all
> its siblings up but not including to the next marker.
> 
> An attempted solution is shown below, but it didn't work. (No 
> chuckling
> please).
> 
> I've tried to do this by creating a template that matches a 
> marker and then
> calculating the position of the following-sibling::marker and 
> placing this
> in a variable. I then try to group all the required elements 
> by testing for
> the position of the context being less than the next marker.
> 
> <xsl:template match="marker">
> 	<xsl:variable name="next-marker"
> select="following-sibling::marker[1]"/>
> 	<xsl:variable name="chunk" select=". |
> following-sibling::*[position()&lt; $next-marker]"/>
> 	<div>
> 		<mblock><xsl:apply-templates select="$chunk"/></mblock>
> 	</div>
> </xsl:template>
> 
> Thanks
> 
> Paul Clarke