OIOUBL

Definition

Danish UBL CIUS used by NemHandel; OIOUBL 3 (released 2024) aligns with EN 16931.

OIOUBL 2.x predates EN 16931 and adds Danish-specific extensions; OIOUBL 3 maps onto EN 16931 + Peppol BIS Billing.

Validators are published by the Danish Business Authority and run by NemHandel before delivery to public-sector recipients.

Danish national e-invoicing infrastructure built around OIOUBL and now interoperating with Peppol.

Country or sector specific usage specification that constrains EN 16931.

Universal Business Language: an XML library for standard business documents.

Business Interoperability Specifications defining document rules (commonly BIS 3.0 for invoices).