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One is the cross industry invoice under development by the United Nations standards body UNCEFACT and the other is UBL (Universal Business Language) which is issued by [1] http://www.oasis-open.org. Implementations of invoices based on UBL are common, most importantly in the public sector in Denmark. Further implementations are under way in the Scandinavian countries as result of the NES (North European Subset) project http://www.nesubl.eu. Implementations are also underway in , Italy, Spain, Holland and with the European Commission itself.
Source: Wikipedia > Invoice
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