scope:

This International Standard specifies: 1) an ID triggered modular access system, the functions of the modules and the messages they exchange, and the sequence of messages, i.e. transitions of the transaction; 2) the system responsibility from receiving an access request until sending the result. i.e. a complete transaction; 3) the responsibilities of the modules, including time stamping and responding to the requests they received; and 4) the sequence and semantics of the messages and their elements.