namespace-uri-from-QName

The function namespace-uri-from-QName() returns the namespace URI part of an xs:QName value.

Argument	Data Type	Meaning
value	xs:QName?	The xs:QName value whose namespace URI part is required.
Result	xs:string?	The namespace URI part of the xs:QName . If the supplied value is an empty sequence, an empty sequence is returned. An empty sequence is also returned if the namespace URI part of the value is null, that is, if the QName is in no namespace.