key

The key function returns a node-set of nodes that have the given value for the given key.

Syntax

key( keyname, value )

keyname: A string containing the name of the xsl:key element to be used.
value: The returned node-set will contain every node that has this value for the given key.

A node set.

The xsl:key element defines what attribute on what given elements will be used to match the key.

This function is an XSLT-specific addition to XPath. It is not a part of the core XPath function library.

Supported.