Universal Business Language (UBL) is a library of standard electronic XML business documents such as purchase orders and invoices. UBL was developed by an OASIS Technical Committee with participation from a variety of industry data standards organizations. UBL is designed to plug directly into existing business, legal, auditing, and records management practices. It is designed to eliminate the re-keying of data in existing fax- and paper-based business correspondence and provide an entry point into electronic commerce for small and medium-sized businesses.

UBL version 2.0 was approved as an OASIS Committee Specification in October 2006 and has been publicly released. UBL is owned by OASIS and is currently available to all, with no royalty fees. The UBL library of business documents is a well-developed markup language with validators, authoring software, parsers and generators.

UBL 2.0 traces its origins back to the EDI standards and other derived XML standards. In total there are 31 documents covering business needs in the phases of presale, ordering, delivery, invoicing and payment.

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