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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.〔Object Management Group (OMG); ''Object Constraint Language Specification'', Chapter 7 of ''OMG Unified Modeling Language Specification'', Version 1.3, March 2000 (first edition)〕 OCL may now be used with any Meta-Object Facility (MOF) Object Management Group (OMG) meta-model, including UML.〔Object Management Group (OMG); ''Object Constraint Language OMG Available Specification Version 2.0'', May 2006〕 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. == Description == OCL is a descendant of Syntropy, a second-generation object-oriented analysis and design method. The OCL 1.4 definition specified a constraint language. In OCL 2.0, the definition has been extended to include general object query language definitions. OCL statements are constructed in four parts: # a context that defines the limited situation in which the statement is valid # a property that represents some characteristics of the context (e.g., if the context is a class, a property might be an attribute) # an operation (e.g., arithmetic, set-oriented) that manipulates or qualifies a property, and # keywords (e.g., if, then, else, and, or, not, implies) that are used to specify conditional expressions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Object Constraint Language」の詳細全文を読む スポンサード リンク
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