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RE: [xsl] Relative XPATH between 2 nodes

Subject: RE: [xsl] Relative XPATH between 2 nodes
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Fri, 28 Jan 2005 15:31:51 -0000

> If the input is just the Xpaths then clearly one algorithm  
> is to delete
> "equivalent" steps from the start of each path,

Only if the paths select single nodes. If the paths are




then you can't return


unless you know there is only one b.

The problem is seriously under-specified.

Michael Kay

 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
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