Re: [xsl] Transitive closure for XPath

Subject: Re: [xsl] Transitive closure for XPath
From: Francis Norton <francis@xxxxxxxxxxx>
Date: Thu, 26 Apr 2001 13:42:36 +0100
[Sorry about the delayed response]

Michael Kay wrote:
> > So we would still have a closure() function but have a notation for
> > delayed evaluation:
> >
> >       closure(/closure/node[1], delay::key("myKey", @child))
> >
> The concept you are looking for is "higher-order functions", available in
> many functional programming languages. The concept is consistent with the
> XPath conceptual model, but disagreeable to those who want the language to
> stop short of being a general purpose programming language.
I don't want to see XSLT becoming a general purpose programming language
but I would like to see it become an exceedingly good XML transformation

Closure looks to me very like a solution to the "parts explosion"
problem in SQL - did support  for this ever reach one of the SQL

It seems to be a wide and relevent requirement for a language
specialised to manipulating a specific type of data structure. 


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