Re: [xsl] Count Ancestors Up To But Not Including a Given Type

[Eliot Kimber <ekimber@xxxxxxxxxxxx>]

David Carlisle wrote:

> <xsl:stylesheet version="2.0"
> 		xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> 		xmlns:xs="http://www.w3.org/2001/XMLSchema";
> 		xmlns:f="data:,f"
> 		>
>
>
>   <xsl:function name="f:same" as="element()*">
>     <xsl:param name="n" as="element()"/>
>     <xsl:sequence select="$n,$n/../..[node-name(.)=node-name($n)]/f:same(.)"/>
>   </xsl:function>
>
> <xsl:template match="y">
> :<xsl:value-of select="count(f:same(../..)/name())"/>
> </xsl:template>

These are very helpful examples--I find the select="x,f(x)" construct 
quite elegant (and familiar now that I remember my old lisp/DSSSL training).

But I realize I didn't give the full story, which is that the number of 
ancestors between a given list item and its parent list is variable, in 
that DITA allows both:

<ol><li><ol><li>

and

<ol><li><p><ol><li>

So a simple "../.." won't be reliable.  (Although one could argue that 
the intervening <p> should restart the list sequence--I'm not sure the 
DITA 1.1 spec is clear on that point.)

In thinking about it more I don't think there's a way to generalize this 
to a query that is not DTD-specific since you have to know which 
intervening elements to ignore and which to respect.

Thanks,

Eliot

--
Eliot Kimber
Senior Solutions Architect
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