- From: Michael Kay <mhkay@iclway.co.uk>
- Date: Tue, 24 Apr 2001 10:38:23 +0100
- To: "'Christian Nentwich'" <c.nentwich@cs.ucl.ac.uk>, "'xsl-editors'" <xsl-editors@w3.org>
> For higher order functions, some lexical construct is needed
> that prevents
> an XPath processor from evaluating the parameters passed to a function
> before evaluating the function. If you want to pass a function as a
> parameter, you will have to prevent the processor from evaluating that
> function before passing it.
Yes. Saxon's solution is to combine this with the facility to create an
expression from a string, so you write
saxon:sum($nodeset, saxon:expression("@price * @qty"))
(An expression is logically a function whose only argument is the XPath
context)
I think David Rosenborg's FXPath proposal has gone rather further than this,
towards full lambda expressions.
Mike Kay
Received on Tuesday, 24 April 2001 05:36:11 UTC