namespace-uri()

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The namespace-uri() returns the namespace URI of a node.

Syntax:

string namespace-uri(node-set[optional]) 

Arguments:

Optionally, a node-set. If no argument is specified, the function uses the context node.

Result:

A string with the namespace URI of the expanded name of the context node, if no argument is specified, the namespace URI of the expanded name of the first node if a node-set is specified, or an empty string if an empty node-set is given. Only element and attribute nodes are not empty.

Defined: XPath, section 4.1.

NS support: Supported as of 7.0.