Reference
UBL
Universal Business Language: an XML library for standard business documents.
Explanation
Used by PEPPOL BIS and many national e-invoicing implementations.
Invoice documents are typically based on UBL Invoice / CreditNote.
This article treats UBL as a practical reference, not just a navigation page. It explains the term or workflow in context, shows why it matters for European e-invoicing, and connects the topic to invoice creation, validation, routing, archiving, and ERP implementation decisions.