URI reference to external item information or specifications. E.g. web address

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Example value
https://test-vefa.difi.no/peppolbis/pracc/catalogue
Rules
Identifier/Error message Flag
EUGEN-T68-B19401
Document MUST NOT contain elements not part of the data model.
fatal