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

Cardinality
1..1
Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Example value
http://www.test.no/image.jpg
Business terms
tir19-086
Rules
Identifier/Error message Flag
EHF-T19-B20301
Document MUST NOT contain elements not part of the data model.
fatal