ISO 15000-2:2021 describes the AS4 Profile, which provides a subset of the functionality of ISO 15000-1:2021, along with implementation guidelines based on the "just-enough" design principles and electronic data interchange functional requirements to trim down ISO 15000-1:2021 into a more simplified specification for web services business-to-business messaging.

It specifies:

- three conformance profiles of ISO 15000-1:2021 (see Clause 4);

- a number of AS4 additional features (see Clause 5);

- complementary requirements for the AS4 multi-hop profile (see Clause 6);

- AS4 usage profile of ISO 15000-1:2021 (see Clause 7);

- definitions of conformance (see Clause 8).

Annex A provides some sample messages to support implementation.

Annex B provides a sample XSLT stylesheet to generate an AS4 receipt.

This document is applicable to all types of organizations (e.g., commercial enterprises, government agencies, not-for-profit organizations) that exchange documents or data electronically using messaging.