Re: Functional programming in XSLT
Hi Alexey, > XSLT is frequently called a functional programming language. However, > few important constructions common for functional languages are missing > in XSLT. > > At my opinion, adding the following features to XSLT could make it more > suitable for the functional programming. > > > 1. Lambda-elements > ------------------ [...] You may want to have a look at http://www.pantor.com/fxpath/ and http://www.jenitennison.com/xslt/exslt/functions/ The documents describe two approaches to achive similar functionality to your proposal. FXPath does this by extending XPath and EXSLT by using XSLT instructions. However, none of these documents inlcude a definition of how to use higher order functions or treating functions as first class objects if you like. In the discussions that lead to these documents, a couple of approaches to call functions by name were brought up: different vairants of exsl:evaluate (string) and exsl:apply (string, object ...). In the FXPath the notion of a function object is introduced. This could easily be extended (as hinted in the first paragraph of chapter 6) to use functions as first class objects. A fx:call (func, object, ....) extension function would be needed, and the function definition expression should be treaded as a primary expression. This would be easy to specify, a bit harder to implement in the general case though (in the light of current XSLT/XPath engines). Cheers, </David> David Rosenborg Pantor Engineering AB XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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