Re: [xsl] Transitive closure for XPath

[Francis Norton <francis at redrice dot com>]

Christian Nentwich wrote:
> 
> 
> Would you please comment on a little proposal I have written - includes
> an implementation of the operator for Xalan as a freebie:
> 
> http://www.cs.ucl.ac.uk/staff/c.nentwich/closure/
> 
> Just imagine what this operator could do for *your* family tree XSLT
> stylesheet. Am I the only one who finds this (extremely) useful ? Please
> comment.
> 
Cute. Presumably as well as 

	closure(/closure/node[1], id(@child))

you could have 

	closure(/closure/node[1], key("myKey", @child))

You need delayed evaluation of parameters. Is this straightforward in
other XSLT engines?

(Of course I'd like to rename it to expand-o-graph() since that's how I
visualise its operation)

Francis.

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