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SysML v2 and the Next Generation of Modeling Languages

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The Systems Modeling Language (SysML) is a particularly successful offshoot of the Unified Modeling Language (UML) tailored for Model-Based Systems Engineering. After a decade of growing use of SysML, in 2017 the Object Management Group (OMG) issued a Request for Proposals (RFP) for a new version of the language. A year into the ongoing work to respond to this RFP, it is clear that SysML v2 needs to be more than just an expansion of the functional capabilities of SysML. Rather, it must address fundamental architectural issues that have made it difficult to further evolve SysML v1 to address the needs of its user community. Therefore, the language is being re-designed using a new kernel metamodel with formally grounded semantics. This kernel can then be extended using semantic model libraries, rather than by expanding the language metamodel itself. This approach will allow SysML v2 to be not only the modeling language for traditional systems engineering, but also the foundation for a whole new generation of modeling languages.

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SysML v2 and the Next Generation of Modeling Languages

  1. 1. SST Vienna University of Technology 18 February 2019 Ed Seidewitz Chief Technology Officer Model Driven Solutions SysML v2 and the Next Generation of Modeling Languages
  2. 2. SSTWhat is SysML?  The Systems Modeling Language™ (SysML®) is a profile of UML that “…supports the specification, analysis, design, and verification and validation of complex systems that may include hardware, software, information, processes, personnel, and facilities” *  SysML has facilitated awareness and adoption of Model-Based Systems Engineering (MBSE).  SysML has evolved to address user and vendor needs.  v1.0, adopted in 2006; v1.5, current version; v1.6, pending approval; v1.7, in process 18 February 2019 * From OMG Systems Modeling Language specification, v1.5, Introduction
  3. 3. SSTSysML v1 Language Architecture 18 February 2019 From OMG Systems Modeling Language specification, v1.5, Figure 4.2
  4. 4. SSTSysML Block Definition Diagram 18 February 2019 SysML Block Definition Diagram (IBD) is an adaptation of the UML class diagram.
  5. 5. SSTSysML Internal Block Diagram 18 February 2019 For example, can nested parts have different properties? No, internal structure is the same for all instances of a type. SysML language design has been limited by being a UML profile SysML Internal Block Diagram (IBD) is an adaptation of the UML composite structure diagram.
  6. 6. SSTOther Desired Enhancements  Functional enhancements  Improved integration with analysis, variant modeling, geometric modeling, etc.  Flexible visualization  Textual, diagrammatic, tabular, dynamic, interactive, etc.  Improved interoperability  Between SysML tools and with other tools 18 February 2019
  7. 7. SSTSysML v2 Requests for Proposals  SysML v2 RFP issued December, 2017  Initial Submission: November, 2019  Revised (Final) Submission: November, 2020  SysML v2 API & Services RFP issued June, 2018  Initial Submission: February, 2020  Revised (Final) Submission: February, 2021  SysML Submission Team (SST) formed December 2017  Leads: Sandy Friedenthal, Ed Seidewitz 18 February 2019
  8. 8. SSTSysML v2 SubmissionTeam (SST)  A broad team of end users, vendors, academics, and government liaisons  Currently 90+ members from 60+ organizations  Developing submissions to both RFPs  Driven by RFP requirements and user needs 18 February 2019
  9. 9. SSTUsage Focused Modeling 18 February 2019 A paradigm shift to make SysML v2 more precise and intuitive to use  Emphasizes modeling of usages (e.g., parts on an IBD)  Decompose, connect, and group usages  Supports other language requirements  variant design configurations, individuals, analysis, verification, …
  10. 10. SSTVehicle: Internal Block Diagram (SysML v1) 18 February 2019 Internal structure is the same for all instances of a type.
  11. 11. SSTVehicle: Internal Block Diagram (SysML v2) 18 February 2019 Connector to nested port Usage-specific property values
  12. 12. SSTSysML v2 Language Architecture 18 February 2019 SysML v2 will be based on a kernel metamodel, rather than UML. The kernel semantics will be grounded in a declarative formalism. Full language semantics will be specified using a semantic model library.
  13. 13. SSTKernel Abstract Syntax 2018-12 Baseline 18 February 2019 Principles • No abstract classes • Library-based semantics • Reification of meta-associations as relationships Highlights • Flexible packaging (including ”smart” packages) • Features as “categories” (allowing nested features and features as types) • Deeply nested connector ends • Common model for behavior • Expressions as features typed by functions Note: Relationships are notionally association classes, but cannot really be represented as such in MOF. • Builds on previous work done toward a Kernel Modeling Language (KerML). • Uses generic, not SysML-specific, terminology (e.g., “class”, not “block”)
  14. 14. SSTKernel Abstract Syntax Relationships 18 February 2019 Reified membership model Unified connector/flow model Integrated generalization model
  15. 15. SSTKernel Model Library Base and ScalarValues 18 February 2019
  16. 16. SSTClasses 18 February 2019 LibrarymodelSystemmodelSystem The stereotype indicates the intended kernel metaclass for the model element. “Individuals” here are not model elements, but members of the semantic extent of a class. A class with no superclass automatically specializes the library class Object.
  17. 17. SSTFeatures 18 February 2019 LibrarymodelSystemmodelSystem The instances of a feature are ordered pairs of individuals. A feature typed by an object class automatically subsets the library feature objects.
  18. 18. SSTNested Features 18 February 2019 LibrarymodelSystemmodelSystem An instance of a nested feature is a pair in which the first member is also a pair.
  19. 19. SSTExpressions Mapping to Abstract Syntax 18 February 2019 class Assembly { feature m = c1.m + c2.m; part c1: Component1 { feature m: MassValue redefines Quantity; } part c2: Component2 { feature m: MassValue redefines Quantity; } } The user model with a surface expression language has this composite structure.
  20. 20. SSTExpressions Usage of Model Library 18 February 2019
  21. 21. SSTThe Next Generation  The SysML v2 specification will include a separate volume with a self-contained definition of the Kernel.  The system-specific extensions will be largely built using model libraries, written in SysML v2 itself.  It will be natural to build a other modeling languages on this rigorous foundation. Will UML v3 be a profile of SysML v2? 18 February 2019

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