OCL Expressions
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'''Object Constraint Language''' ('''OCL''') is a [[wikipedia:Declarative_programming|declarative language]] for describing rules that apply to [[wikipedia:Unified_Modeling_Language|Unified Modeling Language (UML)]] models developed at [[wikipedia:IBM|IBM]] and now part of the UML standard. Initially, OCL was only a formal specification language extension to UML.<sup>[1]</sup> OCL may now be used with any [[wikipedia:Meta-Object_Facility|Meta-Object Facility]](MOF), [[wikipedia:Object_Management_Group|Object Management Group]](OMG), [[wikipedia:Metamodeling|meta-model]], including UML.<sup>[2]</sup> The Object Constraint Language is a precise text language that provides constraint and object query expressions on any MOF model or meta-model that cannot otherwise be expressed by diagrammatic notation. OCL is a key component of the new OMG standard recommendation for transforming models, the Queries/Views/Transformations ([[wikipedia:QVT|QVT]]) specification. | '''Object Constraint Language''' ('''OCL''') is a [[wikipedia:Declarative_programming|declarative language]] for describing rules that apply to [[wikipedia:Unified_Modeling_Language|Unified Modeling Language (UML)]] models developed at [[wikipedia:IBM|IBM]] and now part of the UML standard. Initially, OCL was only a formal specification language extension to UML.<sup>[1]</sup> OCL may now be used with any [[wikipedia:Meta-Object_Facility|Meta-Object Facility]](MOF), [[wikipedia:Object_Management_Group|Object Management Group]](OMG), [[wikipedia:Metamodeling|meta-model]], including UML.<sup>[2]</sup> The Object Constraint Language is a precise text language that provides constraint and object query expressions on any MOF model or meta-model that cannot otherwise be expressed by diagrammatic notation. OCL is a key component of the new OMG standard recommendation for transforming models, the Queries/Views/Transformations ([[wikipedia:QVT|QVT]]) specification. | ||
Revision as of 08:02, 17 June 2024
This page was created by Alexandra on 2017-04-16. Last edited by Stephanie@mdriven.net on 2025-03-19.
Object Constraint Language (OCL) is a declarative language for describing rules that apply to Unified Modeling Language (UML) models developed at IBM and now part of the UML standard. Initially, OCL was only a formal specification language extension to UML.[1] OCL may now be used with any Meta-Object Facility(MOF), Object Management Group(OMG), meta-model, including UML.[2] The Object Constraint Language is a precise text language that provides constraint and object query expressions on any MOF model or meta-model that cannot otherwise be expressed by diagrammatic notation. OCL is a key component of the new OMG standard recommendation for transforming models, the Queries/Views/Transformations (QVT) specification.
Different ways MDriven relies on OCL:
- As a constraint definition on a class
- As a description of derivation rule on derived attributes
- As a description of derivation of derived associations
- As ViewModel columns and Nesting definitions
- As definitions for Visible and Enable state for ViewModel columns
- As an expression of style information on ViewModel columns
- As an expression for object presentation on classes
- Action Enable expression
- State machine Guards
OCL expression must be without side effects. It is a query language and as such it is not expected to change data as the language is applied.
Learn more:
Part 1 OCL: Common Expressions
Part 2 OCL: Operators
Part 3 OCL: Derivation Properties
The MDriven Book - Next Chapter: Certain important constructs