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. | |||
===== Different ways MDriven relies on OCL: ===== | ===== Different ways MDriven relies on OCL: ===== | ||
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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. | 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: ====== | ====== Learn more with these Video Tutorials: ====== | ||
* [[Documentation:Part 1 OCL Common Expressions|Part 1 OCL: Common Expressions]] | |||
* [[Documentation:Part 2 OCL: Operators|Part 2 OCL: Operators]] | |||
* [[Documentation:Part 3 OCL: Derivation properties|Part 3 OCL: Derivation Properties]] | |||
= | '''<span style="color: #1a50ad">The MDriven Book</span>''' - '''Next Chapter:''' [[Training:Certain important constructs|Certain important constructs]] | ||
{{Edited|July|12|2025}} | |||
[[Category:OCL]] | [[Category:OCL]] | ||
[[Category:Beginner]] | [[Category:Beginner]] | ||
[[Category:The MDriven Book]] | [[Category:The MDriven Book]] | ||
Latest revision as of 05:13, 19 March 2025
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 with these Video Tutorials:
The MDriven Book - Next Chapter: Certain important constructs