cac:ExternalReference
An external reference to place your questions or add an attachment to express questions in more detail. There must be only one kind of reference a file or questions.
- Namespace
 cacurn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2- Data type
 - cac:ExternalReferenceType
 - Child elements
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Card Name Description 0..1 cbc:MimeCode Mime code of the file
A code signifying the mime type of the external object.0..1 cbc:FileName A reference to an ASiC-e attachment.
A file reference within the ASiC-e which may contain additional information to express questions in more detail.0..n cbc:Description Tendering request
The tendering request about the procurement procedure. - Rules
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Identifier/Error message Flag PEPPOL-T010-R028 
A combination of clarification and file reference is not allowed.fatal