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

title	namespace-uri-from-QName (XQuery) | Microsoft Docs
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ms.date	03/04/2017
ms.prod	sql
ms.prod_service	sql
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ms.technology	xml
ms.topic	language-reference
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Functions Related to QNames - namespace-uri-from-QName

[!INCLUDEtsql-appliesto-ss2012-xxxx-xxxx-xxx-md]

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)