RE: [xsl] Recursive positional grouping (was xsl digest...)

Within xsl:for-each-group, current-group() selects all the nodes in the
group being processed, whereas "." selects only the first node in that
group. Writing "." is equivalent to writing current-group()[1].

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

> -----Original Message-----
> From: john jacks [mailto:john.jacks@xxxxxxxxxxx] 
> Sent: 05 April 2007 08:28
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: RE: [xsl] Recursive positional grouping (was xsl digest...)
> 
> Thanks Michael.
> (As Abel pointed out, I'm replying to the digest since that's 
> what I receive).
> 
> This works nicely. I don't understand the difference between 
> <xsl:apply-templates select="."/>
> 
> and
> 
> <xsl:apply-templates select="current-group()"/>
> 
> within the xsl:for-each-group instruction.
> 
> The book says ' use current-group() is sometimes better 
> especially if the group includes elements of different types' 
> which this example does.
> 
> How can I understand the difference please?
> 
> JJ
> 
> 
> From: "Michael Kay" <mike@xxxxxxxxxxxx>
> Subject: RE: [xsl] Recursive positional grouping (was xsl digest...)
> Message-ID: <009e01c7769e$d165d290$6401a8c0@turtle>
> 
> I think your problem is that 
> 
> <xsl:apply-templates select="current-group()"/>
> 
> is processing all the elements in a group, not only the 
> next-level headings
> - so the paragraphs are output at every level.
> 
> I think this kind of recursive grouping works best if you use 
> a named template that is passed the contents of a group as a 
> parameter. Try something like this:
> 
> <?xml version="1.0" encoding="ISO-8859-1"?> <xsl:stylesheet 
> version="2.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";;
>   xmlns:xs="http://www.w3.org/2001/XMLSchema";;>
> <xsl:output indent="yes"/>
> 
> <xsl:template name="group">
>   <xsl:param name="pop" as="element()*"/>
>   <xsl:param name="level" as="xs:integer" />
>   <xsl:variable name="key" as="xs:string" select="concat('h', 
> $level)"/>
>     <xsl:for-each-group select="$pop" 
> group-starting-with="*[name() eq $key]">
>       <xsl:choose>
>         <xsl:when test="starts-with(name(.), 'h')">
>           <section level="{$level}">     
>             <head><xsl:apply-templates 
> select="current-group()[1]"/></head>
>             <xsl:call-template name="group">
>               <xsl:with-param name="pop" 
> select="remove(current-group(), 1)"/>
>               <xsl:with-param name="level" select="$level + 1"/>
>             </xsl:call-template>
>           </section> 
>         </xsl:when>
>         <xsl:otherwise>
>           <xsl:copy-of select="current-group()"/>
>         </xsl:otherwise>
>       </xsl:choose>    
>     </xsl:for-each-group>
> </xsl:template>
> 
> <xsl:template match="/">
>   <doc>
>     <xsl:call-template name="group">
>       <xsl:with-param name="pop" select="body/*"/>
>       <xsl:with-param name="level" select="1"/>
>     </xsl:call-template>
>   </doc>
> </xsl:template>
> 
> </xsl:stylesheet>
> 
> 
> 
> 
> 
> 
> 	
> 	
> 		
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