SERVICE SPECIFICATION AND ITS PROTOCOL SPECIFICATIONS IN LOTOS - A SURVEY FOR SYNTHESIS AND EXECUTION

LOTOS is a language developed within ISO for the formal description of communication protocols and distributed systems. in LOTOS, requirements for a distributed system are called a "service specification". Each node exchanges synchronization messages to ensure the temporal ordering for the execution of events in a service specification. The actions of each node are described as a "protocol specification". This paper gives a survey for a method to derive protocol specifications from a service specification written in a LOTOS based language. In order to derive the protocol specifications, we make the syntax tree of a given service specification and give some attributes for each node in the tree. The protocol specifications are derived automatically by evaluating these attributes. The derived protocol specifications satisfy the given service specification. We also explain a LOTOS simulator for the execution of derived protocol specifications. The related works are also summarized.