functions-related-to-qnames-namespace-uri-from-qname.md

title	namespace-uri-from-QName (XQuery)
description	Learn how to use the namespace-uri-from-QName function to retrieve the namespace URI of a QName.
author	rothja
ms.author	jroth
ms.date	03/04/2017
ms.service	sql
ms.subservice	xml
ms.topic	reference
helpviewer_keywords	fn:namespace-uri-from-QName function namespace-uri-from-QName function
dev_langs	XML

Functions Related to QNames - namespace-uri-from-QName

[!INCLUDE SQL Server Azure SQL Database]

Returns a string representing the namespace uri of the QName specified by $arg. The result is the empty sequence if $arg is the empty sequence.

Syntax

namespace-uri-from-QName($arg as xs:QName?) as xs:string?  

Arguments

$arg
Is the QName whose namespace URI is returned.

Examples

This topic provides XQuery examples against XML instances that are stored in various xml type columns in the AdventureWorks database.

A. Retrieve the namespace URI from a QName

For a working sample, see local-name-from-QName (XQuery).

Implementation Limitations

These are the limitations:

• The namespace-uri-from-QName() function returns instances of xs:string instead of xs:anyURI.

See Also

Functions Related to QNames (XQuery)