SDL

Specification and Design Language.

Defined by the ITU-T (recommendation Z100) to provide a toolfor unambiguous specification and description of the behaviourof telecommunications systems. The area of application alsoincludes process control and real-time applications. SDLprovides a Graphic Representation (SDL/GR) and a textualPhrase Representation (SDL/PR), which are equivalentrepresentations of the same semantics. A system is specifiedas a set of interconnected abstract machines which areextensions of the Finite State Machine (FSM).

1. System Software Development Language. System software forthe B1700. "System Software Development Language ReferenceManual", 1081346, Burroughs Corp (Dec 1974).

2. Specification and Description Language. ITU-T.Specification language with both graphical and character-basedsyntaxes for defining interacting extended finite statemachines. Used to specify discrete interactive systems suchas industrial process control, traffic control, andtelecommunication systems. Proc Plenary Assembly, Melbourne14-1988-11-25, Fasc X.1, CCITT. "Telecommunications SystemsEngineering Using SDL", R. Saracco et al, N-H 1989. Availablefrom Verilog, MD. (See XDL).

3. Shared Dataspace Language. "A Shared Dataspace LanguageSupporting Large-Scale Concurrency", G. Roman et al, Proc 8thIntl Conf Distrib Comp Sys, IEEE 1988, pp.265-272.

4. Structure Definition Language. Used internally by DEC todefine and generate the symbols used for VAX/VMS internal datastructures in various languages.

5. System Description Language. language used by the Eiffel/Simplementation of Eiffel to assemble clusters into a system.(see Lace).

SDL

(Specification and Description Language) A modeling language used to describe real-time systems. It is widely used to model state machines in the telecommunications, aviation, automotive and medical industries. SDL is used to model the details of a system, which can be simulated and proven, whereas UML is used to model at a higher level of abstraction.

There are three parts to an SDL diagram: the system definition, block and process. The system definition defines the major nodes (blocks) of the system such as clients and servers, while the block charts show more details. The process diagram shows the processing steps in each block. See state machine and UML.

SDL Process Diagram

This simple system in a server lets the user add two numbers at a terminal. There is more detail in this diagram than in the UML model from which it originated (see below). (Diagram courtesy of Telelogic, AB, www.telelogic.com)

UML Equivalent

This UML diagram was turned into the SDL description above by Telelogic's UML to SDL Translator (see UML for more diagrams). (Diagram courtesy of Telelogic, AB, www.telelogic.com)

SDL

Acronym	Definition
SDL➣SAW (Surface Acoustic Wave) Delay Line
SDL➣Security Development Lifecycle
SDL➣Sturm der Liebe (German: Storm of Love)
SDL➣Simple DirectMedia Layer
SDL➣Skills Development Levy (tax; South Africa)
SDL➣Studio Daniel Libeskind (architecture firm; various locations)
SDL➣School of Distance Learning (various organizations)
SDL➣Self Directed Learning
SDL➣Scheduling Description Language
SDL➣Simple Data Link
SDL➣Solution Deliverables List
SDL➣Shielded Data Link
SDL➣Specification and Description Language
SDL➣System Directory List
SDL➣Service Definition Language
SDL➣Simple Directmedia Library
SDL➣Sound Library
SDL➣Slidell (Amtrak station code; Slidell, LA)
SDL➣Specification and Description Language (CCITT)
SDL➣Software Development Lifecycle
SDL➣Space Dynamics Laboratory
SDL➣Sustainable Development Law
SDL➣Schematic Driven Layout
SDL➣Service Description Language
SDL➣School District Leadership (New York)
SDL➣Software Development Library
SDL➣System Description Language
SDL➣Structural Dynamics Laboratory (US NASA)
SDL➣Statewide Database Licensing (Washington State Library)
SDL➣Systems Development Laboratory (JPL)
SDL➣Specification and Design Language
SDL➣System Design Language
SDL➣Sogosogo Duavata Ni Lewenivanua (United Fiji Party, Fiji)
SDL➣Service Delivery Lead
SDL➣Storage Definition Language
SDL➣Statistical Disclosure Limitation
SDL➣System Design Laboratory
SDL➣School Download Library (OverDrive, Inc.)
SDL➣Software Development Laboratory
SDL➣Superimposed Dead Load
SDL➣Serial Data Link
SDL➣Sundsvall, Sweden - Sundsvall (Airport Code)
SDL➣Search Digital Libraries
SDL➣Secure Domain Logon
SDL➣Structure Description Language
SDL➣Strana Demokratické Levice (Czech Republic)
SDL➣Supported Distance Learning (various locations)
SDL➣Symbian Developer Library (computing)
SDL➣Signaling Data Link
SDL➣Sociolinguistique et Dynamique des Langues (French: Sociolinguistics and Dynamic Languages)
SDL➣Standard Distribution List
SDL➣Satellite Data Link
SDL➣Soft Defect Localization (scanning laser microscopy methodology)
SDL➣Software Development Lohninger
SDL➣Surface Data Logging
SDL➣State Designated Level
SDL➣Sample Detection Limit
SDL➣Structured Design Language
SDL➣Scouts du Liban (Lebanon)
SDL➣Stammdienststelle der Luftwaffe (German)
SDL➣Sensor Data Link
SDL➣Synchronous Delay Line
SDL➣Switched Delay Line (fiber optics)
SDL➣Supplementary Defect List
SDL➣Screen Definition Language
SDL➣Shared Distribution List
SDL➣Solution Demonstration Laboratory
SDL➣Space Disturbances Laboratory
SDL➣Scottsdale, Arizona - Municipal (airport code)
SDL➣Smart Data Loopback (Hekimian)
SDL➣Supplier Document List
SDL➣Subcontractor Data List
SDL➣Standard Direct Layer (low level computer graphics)