Message

Mime code must be according to subset of IANA code list.

Context
cbc:EmbeddedDocumentBinaryObject[@mimeCode]
Test
some $code in $MIMECODE satisfies @mimeCode = $code
Usage
/ ubl:Invoice / cac:AdditionalDocumentReference / cac:Attachment / cbc:EmbeddedDocumentBinaryObject / @mimeCode
/ ubl:CreditNote / cac:AdditionalDocumentReference / cac:Attachment / cbc:EmbeddedDocumentBinaryObject / @mimeCode