Specification and Description Language (network)(source:
foldoc)
Defined by the ITU-T
(recommendation Z100) to provide a tool for unambiguous specification and
description of the behaviour of telecommunications systems. The area of
application also includes process control and real-time applications. SDL
provides a Graphic Representation (SDL/GR) and a textual Phrase Representation
(SDL/PR), which are equivalent representations of the same semantics. A
system is specified as a set of interconnected abstract
machines which are extensions of the Finite
State Machine (FSM).
The basis for description of behaviour is communicating Extended State
Machines that are represented by processes. Communication is represented
by signals and can take place between processes or between processes and
the environment of the system model. Some aspects of communication between
processes are closely related to the description of system structure.
An Extended State Machine consists of a number of states and a number of
transitions connecting the states. One of the states is designated the initial
state.
1. System Software Development Language
System software for the B1700. "System Software Development Language Reference
Manual", 1081346, Burroughs Corp (Dec 1974).
2. Specification and Description Language ITU.
Specification language with both graphical and character-based syntaxes
for defining interacting extended finite state machines. Used to specify
discrete interactive systems such as industrial process control, traffic
control, and telecommunication systems. Proc Plenary Assembly, Melbourne
14-25 Nov 1988, Fasc X.1, CCITT. "Telecommunications Systems Engineering
Using SDL", R. Saracco et al, N-H 1989. Available from Verilog, MD. (See
XDL).
For more information see
the SDL WWW Server:
(http://www.tdr.dk/public/SoftwareEngineering/SDL/)
and what
is SDL?.
See also the site of the SDL Forum
(http://www.sdl-forum.org/SDL/index.htm).
The Institut National des Télécommunications
organise also the SDL 97 Forum, to have informations contact sdl97@int-evry.fr
or visit the site: http://alix.int-evry.fr/lor/SDL97/.
3. Shared Dataspace Language
"A Shared Dataspace Language Supporting Large-Scale Concurrency", G. Roman
et al, Proc 8th Intl Conf Distrib Comp Sys, IEEE 1988, pp.265-272.
4. Structure Definition Language
Used internally by DEC to define and generate the symbols used for VAX/VMS
internal data structures in various languages.
5. System Description Language
language used by the Eiffel/S implementation of Eiffel to assemble clusters
into a system. (see Lace).
2. Langage de Spécification et de Description (network)
Langage formel défini dans la recommandation Z.100 de l'UIT
pour les systèmes temps-réel, en particulier les équipements
télécommunications de commutation.
Le langage s'appuie sur la description de machine communicantes à états
étendus repésentées par des processus. Les communications
sont représentées par des signals qui peuvent s'intercaler entre
les processus ou entre les processus et l'environnement système du
modèle. Certains aspects de la communication entre les processus sont
fortements liés à la description de la structure système.
La machine à états étendus consiste en un nombre d'états
et un nombre de transitions reliant les différents états entre
eux. L'un des états est désigné comme l'état initial.
Pour plus d'information se reporter a à deux sites de référence.
Le serveur www SDL:
(http://www.tdr.dk/public/SoftwareEngineering/SDL/)
avec what
is SDL?
Le site du SDL Forum
(http://www.sdl-forum.org/SDL/index.htm).
Le département LOgiciels
et Réseaux de l'Institut National des
Télécommunications participe aux développements
autour de SDL et héberge le huitième forum SDL 97.
Pour avoir de plus amples informations contactez sdl97@int-evry.fr
ou visitez the site du forum: http://alix.int-evry.fr/lor/SDL97/.