AS4

AS4 (Applicability Statement 4) is an open standard for the secure and payload-agnostic exchange of Business-to-business documents using Web services. Secure document exchange is governed by aspects of WS-Security, including XML Encryption and XML Digital Signatures. Payload agnosticism refers to the document type (e.g. purchase order, invoice, etc.) not being tied to any defined SOAP action or operation.

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It is a Conformance Profile of the OASIS ebMS 3.0 specification.[1]

AS4 became a standard in 2013.[2] The majority of the AS4 profiling points constraining the ebMS 3.0 specification are based upon the functional requirements of the AS2 specification. By scaling back ebMS 3.0 using AS2 as a blueprint, AS4 provides an entry-level on-ramp for Web services B2B by simplifying the complexities of Web services.

Key technical highlights
  • Support for SOAP 1.1 and 1.2 enveloping structure
  • Payload agnosticism
  • Support for single or multiple payloads contained either within the SOAP body or as SOAP attachment(s)
  • Support for payload compression
  • Support for message-level security including various combinations of XML Digital Signature and/or XML Encryption
  • Support for X.509 security tokens and username/password tokens
  • Support for business receipt of non-repudiation similar to the Message Disposition Notification (MDN)[3] used by AS2 and specified as an XML schema by the ebXML BPSS group
  • Support for the ebMS 3.0 One-Way/Push message exchange pattern with support for either synchronous or asynchronous responses
  • Support for the ebMS 3.0 One-Way/Pull message exchange pattern which is beneficial for exchanging documents with non-addressable endpoints

References
  1. OASIS ebXML Messaging Services 3.0: Part 1, Core Features
  2. "AS4 Profile of ebMS 3.0 Becomes OASIS Standard". 15 February 2013. Retrieved 10 May 2015.
  3. AS2 MDN


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