ISO 18202:2015

ISO 18202:2015 defines, in an abstract manner, the MAL in terms of: a) the concepts that it builds upon; b) the basic types it provides; c) the message headers required by the layer; d) the relationship between, and the valid sequence of, the messages and resulting behaviours. It does not specify: a) individual implementations or products; b) the implementation of entities or interfaces within real systems; c) the methods or technologies required for communications.