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namespace-uri-from-QName (XQuery)

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.

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

$arg

Is the QName whose namespace URI is returned.

This topic provides XQuery examples against XML instances that are stored in various xml type columns in the AdventureWorks database. For an overview of each of these columns, see xml Data Type Representation 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.

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