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In computer science Language of Temporal Ordering Specification (LOTOS) is a formal specification language based on temporal ordering of events. LOTOS is used for communications protocol specification in International Organization for Standardization (ISO) Open Systems Interconnection model (OSI) standards.
LOTOS (Language of Temporal Ordering Specification) (ISO 8807, 1989) was developed by the FDT experts of the working group ISO/TC97/SC21/WG1 during the 80’s. It is a specification language developed for formal description of the OSI architecture and distributed systems in general.
LOTOS (Language of Temporal Ordering Specification [7]) is a standardised FDT (Formal Description Technique) originally intended for the specification of com munications and distributed systems.
- Kenneth J. Turner, Mihaela Sighireanu
- 2001
LOTOS is a specification language that has been specifically developed for the formal description of the OSI (Open systems Interconnection) architecture, although it is applicable to distributed, concurrent systems in general.
New language features of particular relevance to the invoicing case study include modularity, functional (con-structive) data types, classical programming constructs, a controlled imperative style and strongly typed gates. Since E-LOTOS standardisation is ongoing, the authors have used a snapshot of the language.
This section introduces the Lotos and E-Lotos languages, and how they may be used in requirements capture.
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Software specification methods: an overview using a case study (E)-LOTOS: (Enhanced) language of temporal ordering specification