Namespace URI for UN/CEFACT currency code list

Hi folks,

I've been asked off-list about the namespace for
the UN/CEFACT code list data type for currency:

...
xmlns:clm54217="urn:un:unece:uncefact:codelist:specification:54217:2001"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">