Subject: Re: [xsl] Relative XPATH between 2 nodes From: David Carlisle <davidc@xxxxxxxxx> Date: Fri, 28 Jan 2005 14:49:24 GMT |
> I'm looking for general algorithm, What langauge do you need to implement this in? In general it would need an XPath parser and writing an Xpath parser in XSLT (or Xpath) would be entertaining. Also it depends on your definitions and input. Is the input for the algorithm just the two Xpaths or does it also include an input document. If the input is just the Xpaths then clearly one algorithm is to delete "equivalent" steps from the start of each path, and then to enough ../ to the second for each of the remaing steps in the first so /a/b[2]/c/d /a/b[2]/e/f goes in the first stage to c/d e/f and so finally returns a relative path of ../../e/f However given id('x') id('y') you'd just have to return id('y') On the other hand, if you also input a particular document into teh algorithm and ask for a relative Xpath that gets from one to teh other _in that document_ you may well be able to return something else, eg *[1] if the structrure was <foo id="x"><bar id="y"/>.... David ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________
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