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Specification and Design Language

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SDL (short for Specification and Description Language) is an specification language targeted at the unambiguous specification and description of the behaviour of reactive and distributed systems. It is defined by the ITU-T (Recommendation Z.100.) Originally focused on telecommunication systems, its current areas of application include process control and real-time applications in general.

SDL provides both a graphical Graphic Representation (SDL/GR) as well as a textual Phrase Representation (SDL/PR), which are both equivalent representations of the same underlying semantics. A system is specified as a set of interconnected abstract machines which are extensions of finite state machines (FSM).

SDL is formally complete, so it can be used for code generation for either simulation or final targets.

This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later.

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