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[[OCL Expressions|'''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. In MDriven we do however want to change data when appropriate – so we use the exact same syntax as OCL in something we call [[EAL – ExtendedActionLanguage.|'''EAL – ExtendedActionLanguage.''']] | [[OCL Expressions|'''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. In MDriven we do however want to change data when appropriate – so we use the exact same syntax as OCL in something we call [[EAL – ExtendedActionLanguage.|'''EAL – ExtendedActionLanguage.''']] | ||
[[OCLps|'''OCLps''']] | ==== [[OCLps|'''OCLps''']] ==== | ||
[[Seeking the database with OCLps|'''Seeking the database with OCLps''']] | ==== [[Seeking the database with OCLps|'''Seeking the database with OCLps''']] ==== | ||
[[OCLOperators|'''OCLOperators''']] | ==== [[OCLOperators|'''OCLOperators''']] ==== | ||
[[Certain important constructs|'''Certain important constructs''']] | ==== [[Certain important constructs|'''Certain important constructs''']] ==== | ||
'''[[Methods]]''' | ==== '''[[Methods]]''' ==== | ||
More articles: | |||
==== [[Unique constraints on 1 to 1 links]] ==== | |||
[[ | ==== [[GuardConstraints]] ==== | ||
[[ | ==== [[ClassFromString]] ==== | ||
====[[Understanding OCL with reference to SQL]]==== | ====[[Understanding OCL with reference to SQL]]==== | ||
[[A few words on linq]] | ==== [[Custom types and custom operations in OCL]] ==== | ||
==== [[A few words on linq]] ==== | |||
'''[[OCL by example]]''' | ==== '''[[OCL by example]]''' ==== | ||
[[Category:OCL]] | [[Category:OCL]] | ||
[[Category:Discovery]] | [[Category:Discovery]] | ||
Revision as of 09:57, 31 October 2019
What is Object Constraint Language
The 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. OCL may now be used with any Meta-Object Facility (MOF) Object Management Group (OMG) meta-model, including UML. 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.
Learn more with ☛ OCL Video Tutorials
Different ways MDriven relies on OCL
- As constraint definition on a class
- As description of derivation rule on derived attributes
- As description of derivation of derived associations
- As ViewModel columns and Nesting definitions
- As definitions for Visible and Enable state for ViewModel columns
- As expression of style information on ViewModel columns
- As expression for object presentation on classes
- Action Enable expression
- State machine Guards
MDriven relies heavily on OCL and it is a very powerful tool to describe constraints, actions and transformations in your model.
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. In MDriven we do however want to change data when appropriate – so we use the exact same syntax as OCL in something we call EAL – ExtendedActionLanguage.
OCLps
Seeking the database with OCLps
OCLOperators
Certain important constructs
Methods
More articles:
Unique constraints on 1 to 1 links
GuardConstraints
ClassFromString
Understanding OCL with reference to SQL
Custom types and custom operations in OCL
A few words on linq
OCL by example