How to select distinct values from XML document using XPATH?

Question

How can I select only distinct elements for the XML document using XPATH?I\'ve tried to use the \'distinct-values\' function but it didn\'t work for some reason..

Th

Answer 1

In XPath 2.0:

distinct-values(/*/*/*/name(.))

In XPath 1.0 this cannot be produced with a single XPath expression.

Using XSLT 1.0:

When this transformation is applied on the provided XML document, the wanted result is produced:

size price rating year

A more efficient XSLT 1.0 transformation, using keys: