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namespace-uri

files/en-us/web/xml/xpath/reference/functions/namespace-uri/index.md

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Original Source

The namespace-uri function returns a string representing the namespace URI of the first node in a given node-set.

Syntax

plain

namespace-uri( [node-set] )

Parameters

node-set (optional)
- : The namespace URI of the first node in this node-set will be returned. If this argument is omitted, the current context node will be used.

Return value

A string representing URI of the namespace in which the given node resides.

Description

If the given node does not have a specified namespace, the returned string will be an empty string.
For nodes other than element and attribute nodes, the returned string will always be an empty string.

Specifications

Gecko support

Supported.