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namespace-uri

The namespace-uri function in XQuery returns the namespace URI of the expanded QName of the provided node. It helps retrieve the namespace part associated with elements or attributes.

Syntax

fn:namespace-uri(arg)

The following table describes the argument for this command:

Argument	Required/Optional	Description
arg	Optional	The node whose namespace URI is to be retrieved. If omitted, the context item is used.

Return Value

Returns the

xs:anyURI

representing the namespace URI of the node’s QName.

Returns the empty string

if the node has no namespace.

Returns an empty sequence if the input is empty.

Raises an error if no argument is provided and the context item is absent or not a node.

Examples

The following table lists some sample values and return values:

SAMPLE FUNCTION	OUTPUT
fn:namespace-uri(<a:book xmlns:a="http://example.com"/>)	"http://example.com"
fn:namespace-uri(document{<root/>})	""
fn:namespace-uri(text{"Hello"})	""
fn:namespace-uri(())	""