How to get the common set of two xpath expressions

Question

Can someone tell me please How to get the common set of two xpath expressions. That is opposite of Union (not |)

In XPath 2.0 - you have `intersect` - prior to that there's the `Kaysian` method - see: http://stackoverflow.com/questions/538293/find-common-parent-using-xpath — Jon Clements, May 14 '13 at 13:04

score 3 · Accepted Answer · answered May 15 '13 at 04:15

3

This is the well-known Kayessian formula (identity) for selecting the intersection of two node-sets $ns1 and $ns2 :

$ns1[count(. | $ns2) = count($ns2)]

This formula can be used in all versions of XPath, including 1.0. Just substitute $ns1 and $ns2 with your specific XPath expressions that select the two node-sets you want to intersect.

answered May 15 '13 at 04:15

Dimitre Novatchev

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Thank you @Dimitre Novatchev This is interesting. – Jagath Jayasinghe May 15 '13 at 08:23
@Ravi, You are welcome. Thank you for asking such interesting question. – Dimitre Novatchev May 15 '13 at 14:21

How to get the common set of two xpath expressions

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