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
a/b/c[(_at_)x=3]/d
and
a/b/c[(_at_)x=4]/d
then you can't return
../../c[(_at_)x=4]/d
unless you know there is only one b.
The problem is seriously under-specified.
Michael Kay
http://www.saxonica.com/
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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