RE: XPath for number of preceding nodes sharing an anc

> I want to count the number of preceding nodes that share an
> ancestor node.
>
> My XSL includes:
>
> <xsl:template match="input">
>   <xsl:variable name="input-count"
>     select="count(preceding::input[ancestor::inputform =
> current()/ancestor::inputform]) + 1"/>
>
> This works but ...

It appears to work but it's wrong. You're comparing the string-value of the
ancestor nodes, not their identity. It's possible for two different nodes to
have the same string-value, which will throw your code.

You really need a set intersection here; if you don't want to use an
extension function there's the $x[count(.|$y)=count($y)] trick.

Mike Kay


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