cac:DocumentReference
- Namespace
 cacurn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2- Child elements
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Card Name Description 1..1 cbc:ID Item label reference
A reference to where the label specification can be found, e.g. a URI.Example value:
http://www.label.eu/test/ - Rules
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Identifier/Error message Flag PEPPOL-T19-B24801 
Element 'cbc:ID' MUST be provided.fatal PEPPOL-T19-B24802 
Document MUST NOT contain elements not part of the data model.fatal