How do you identify duplicate values in a numerical sequence using XPath 2.0?

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Use this simple XPath 2.0 expression:

$vSeq[index-of($vSeq,.)[2]]

where $vSeq is the sequence of values in which we want to find the duplicates.

For explanation of how this “works”, see:

http://dnovatchev.wordpress.com/2008/11/16/xpath-2-0-gems-find-all-duplicate-values-in-a-sequence-part-2/

TLDR;
This picture can be a visual explanation.

If the sequence is: 

$vSeq  =  1,   2,   3,   2,   4,   5,   6,   7,   5,   7,   5

Then evaluating the above XPath expression produces: 2, 5, 7

enter image description here

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