Learn OCL
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'''What is Object Constraint Language?''' | |||
The '''Object Constraint Language (OCL)''' is a [[wikipedia:Declarative_programming|declarative language]] used for describing rules that apply to [[UML School|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, but now it may now be used with any Meta-Object Facility (MOF) Object Management Group (OMG) meta-model, including UML. It 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 | Learn more with ☛ '''[[Training:OCL Expressions|OCL Video Tutorials]]''' | ||
* As constraint definition | |||
* As description of derivation rule on derived attributes | === Different ways MDriven relies on OCL: === | ||
* As description of derivation of derived associations | * As a constraint definition of a class | ||
* As a description of the derivation rule on derived attributes | |||
* As a description of the derivation of derived associations | |||
* As ViewModel columns and Nesting definitions | * As ViewModel columns and Nesting definitions | ||
* As definitions for Visible and Enable state for ViewModel columns | * As definitions for Visible and Enable state for ViewModel columns | ||
* As expression of style information on ViewModel columns | * As an expression of style information on ViewModel columns | ||
* As expression for object presentation | * As an expression for object presentation of classes | ||
* Action Enable expression | * As Action Enable expression | ||
* State machine Guards | * As State machine Guards | ||
MDriven relies heavily on OCL | MDriven relies heavily on OCL which is a very powerful tool for describing constraints, actions, and transformations in your model. | ||
[[OCL Expressions|'''OCL expressions''']] 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. We use the same syntax as OCL in something we call [[EAL – ExtendedActionLanguage.|'''EAL – Extended Action Language.''']] | |||
== Explore OCL == | |||
[[ | ==== [[OCLps|'''OCLps''']] ==== | ||
[[ | ==== [[Seeker view]] ==== | ||
[[ | ==== [[OCLOperators|'''OCLOperators''']] ==== | ||
[[ | ==== [[Certain important constructs|'''Certain important constructs''']] ==== | ||
==== '''[[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|A few words on Linq]] ==== | |||
'''[[OCL by example]]''' | ==== '''[[OCL by example|OCL by Example]]''' ==== | ||
[[Category:OCL]] | [[Category:OCL]] | ||
[[Category:Discovery]] | [[Category:Discovery]] | ||
{{Edited|July|12|2024}} | |||
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Latest revision as of 05:13, 14 February 2024
What is Object Constraint Language?
The Object Constraint Language (OCL) is a declarative language used 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, but now it may now be used with any Meta-Object Facility (MOF) Object Management Group (OMG) meta-model, including UML. It 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 a constraint definition of a class
- As a description of the derivation rule on derived attributes
- As a description of the 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 of classes
- As Action Enable expression
- As State machine Guards
MDriven relies heavily on OCL which is a very powerful tool for describing constraints, actions, and transformations in your model.
OCL expressions 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. We use the same syntax as OCL in something we call EAL – Extended Action Language.
Explore OCL
OCLps
Seeker view
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
This page was edited 69 days ago on 02/14/2024. What links here