![]() That's where the powerful Action Language for Foundational UML (Alf) comes in, supported by the Action Language for Foundational UML (Alf) plugin. Specifying low-level aspects of Behavior such as Activities graphically can sometimes be tedious. MagicDraw, Cameo Systems Modeler, and Cameo Simulation Toolkit use the name 'English' for a "default" vendor-specific action scripting language The degree to which the tool knows how to parse or leverage the listed languages varies somewhat. And you may add additional languages such as 'sysphs' (at least as part of the expression specification). The MagicDraw/Cameo family of tools "recognise" at least the following languages for opaque expressions: Binary, Built-in Math, English, Groovy, JRuby, JavaScript, JavaScript Rhino, Jython, Maple, Mathematica, Matlab, Modelica, OCL2.0, SQL, StructuredExpression. Such expressions can be used, for example, in an OpaqueBehavior, on guards on StateMachine transitions, and in Constraints on a ConstraintBlock in SysML Parametrics. UML has a concept opaque expression, which refers to code or maths expressed in a language other than UML. If you want to simulate StateMachines and/or Activities, or execute SysML Parametrics constraint calculations, Magic Model Analyst ® (Cameo Simulation Toolkit ®) is your friend, and learning how to use it will definitely help you take your SysML and MBSE to the next level. See under the fUML zone and fUML zone for a quite comprehensive list of differences. It is based (more or less) on the OMG fUML ® (which stands for Semantics of a Foundational Subset for Executable UML Models), but it in fact does not cover every single bit of latest fUML-1.4, but does goes well beyond fUML-1.4 in some areas with some nice vendor-specific capabilities. The Magic Model Analyst ® (Cameo Simulation Toolkit ®) is an additional plugin, and offers simulation of many aspects of UML and SysML. One can also purchase the Magic Cyber-Systems Engineer ® (Cameo Systems Modeler ®) product bundle, which includes all of these together (but has less flexibility for software engineering, so if you wish to do lots of UML-driven code engineering you might be better off assembling your own combination of plugins around MagicDraw ® UML). The NoMagic suite happens to offer the SysML Requirements features as a separate Cameo Requirements Modeler Plugin. Just as SysML v1.x is based on UML, the MagicDraw SysML Plugin plugin is based on MagicDraw ® UML. If you are beginning with SysML, you probably won't have to deal with OCL directly for a while, but it's very powerful and definitely worth learning a bit as you progress. The Unified Modeling Language (UML ®) leverages the OMG Object Constraint Language (OCL) in its specification, and users can also express many Constraints in OCL. SysML v2 (unlike SysML v1.x) will NOT be directly based on Unified Modeling Language (UML)
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