
fn:namespace-uri-from-QName( $arg as xs:QName? ) as xs:anyURI?
  Returns the namespace URI for $arg as an xs:string. If
  $arg is the empty sequence, the empty sequence is returned. If $arg
  is in no namespace, the zero-length string is returned.
| Parameters | |
|---|---|
| arg | A qualified name. | 
fn:namespace-uri-from-QName(
  fn:QName("http://www.example.com/example", "person") )
=> the namespace URI corresponding to
   "http://www.example.com/example".
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