Validating uml models and ocl constraints

The Object Constraint Language (OCL) is the established language for the specification of properties of objects and object structures in UML models.One reason that it is not yet widely adopted in industry is the lack of proper and integrated tool support for OCL.The import statement is therefore an Eclipse OCL extension that is likely to be part of a future OCL specification revision.Zero or more import statements may be present to specify the URIs of external model elements and optionally alias names for those elements.It describes what the system should do, not (necessarily) how the system should do it.Given such a specification, it is possible to use formal verification techniques to demonstrate that a candidate system design is correct with respect to the specification.

OCL is a key component of the new OMG standard recommendation for transforming models, the Queries/Views/Transformations (QVT) specification.UML tools however provide little support for validating and checking models in early development phases.There is also no substantial support for the Object Constraint Language (OCL).In OCL 2.0, the definition has been extended to include general object query language definitions.OCL statements are constructed in four parts: OCL supplements UML by providing expressions that have neither the ambiguities of natural language nor the inherent difficulty of using complex mathematics.

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