# 22. Virtuoso Functions Guide - namespace-uri

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Functions Index

## namespace-uri

Returns the namespace URI of the extended name of the given node
string namespace-uri ( node_obj any);
Description

If given argument is a node, the function returns the URI string of the namespace specified in the name of node. If the argument is node-set, first node of the node-set will be considered. Empty string is returned if the argument is an empty node-set, a node without name or if the argument is not a node.

If the argument is omitted, context node is used instead as if it is a node-set of one element.

Parameters
node_obj – Node whose namespace URI is to be returned.
Return Types

String

Examples

Find all elements whose namespace URIs contain "html" substring

    //*[contains(namespace-uri(),'html')]

See Also

local-name() name()