The Applicability Statement 2 or AS2 specification defines a mechanism for the secure and reliable transfer of structured business data over the Internet.
AS2 Message Payloads
The AS2 protocol itself does not dictate any limits on the payload of an AS2 message. However. typical AS2 payloads are structured business documents such as Invoices, Purchase Orders etc. and thus AS2 systems facilitate the Electronic Data Interchange or EDI. Some of the major sets of EDI standards are:
- The UN-recommended UN/EDIFACT is the only international standard and is predominant outside of North America.
- The US standard ANSI ASC X12 (X12) is predominant in North America.
- The TRADACOMS standard developed by the ANA (Article Numbering Association now known as GS1) is predominant in the UK retail industry.
- The ODETTE standard used within the European automotive industry
AS2 messages can carry non-EDI payloads such as XML, CSV, Fixed Width, Text, or payloads of other standards or proprietary formats, including any binary files.