Copies of specifications, available in postscript and pdf format, may be. Sincethen, oclhasbecomea keycomponentofanymodeldrivenengineering mde techniqueasthe default language. The ocl file extension is associated with the object constraint language a declarative language for describing rules that apply to unified modeling language uml models, developed by ibm the ocl file stores some kind of data stored in object constraint language. About the object constraint language specification version 2. Eclipse ocl is an implementation of the object constraint language ocl omg standard for emfbased models. The object constraint language ocl appeared as an effort to overcome the limitations of uml when it comes to precisely specifying detailed aspects of a system design. Ocl is strongly typed language welldefined ocl expressions have to satisfy type rules e. Dec 15, 2016 the unified modeling language uml includes a textual language called object constraint language ocl. Parts of the syntax seem to have been influenced by smalltalk. Sql for relational database management systems or xpathxqueries for xml documents. Each ocl expression is the direct translation at the conceptual level of either one of the database constraints e. Object constraint language inria book pdf free download link or read online here in pdf. Object constraint language ocl part of the uml specification. If you are interested in contributing to eclipse ocl, we recommend you to use the oomph setup files, which will prepare the ide and the workspace with all requried sources.
They also specify queries over objects described in a model. A constraint is a restriction on one or more values of part of an objectoriented model or system. Unease about ocls complexity transcends mde where a simple constraint language for uml class diagrams is needed. Pdf object constraint language ocl famma faissal and. Ocl a formal specification language extension to uml. Ocl fills in this gap by providing a simple, implementation format independent language for expressing predicates. The unified modeling language uml includes a textual language called object constraint language ocl. The object constraint language ocl is a declarative language describing rules applying to unified modeling language uml models developed at ibm and is now part of the uml standard. Object constraint language inria book pdf free download link book now. An important rule is that an ocl expression always evaluates to a specific object of a specific type. Context links ocl constraint to specific type class, association class, interface, etc. Every constraint is bound to a specific type class, association class, interface in the uml model its context. It is a wellknown fact that due to the lack of familiarity with ocl, practitioners and even researcher to some extent are reluctant in using ocl.
Also, there is generally no substantial support for constraints written in the object constraint language ocl. If you have oomph installed you simply have to import the ocl and qvto development setups from the catalog. The object constraint language the ocl is used to specify constraints on objects in. The classic core ocl component provides the following capabilities to support ocl integration. The object constraint language second edition written by anneke kleppe and jos warmer, explains in no time, how to complete your platform independent models, with business and query language. Object constraint language specification version 1. Ocl the object constraint language based on presentations from. Ocl object constraint language masarykova univerzita. Uml uses a variety of diagrams for describing both static and dynamic aspects of a system. Case study of object constraints language ocl tools. By using ocl, constraints and queries can be speci ed in a formal yet. 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.
These predefined value types are independent of any object model and part of the definition of ocl. Defines apis for parsing and evaluating ocl constraints and queries on ecore or uml models. This site is like a library, you could find million book here by using search box in the header. Down closedfixed 315655 use xtext editor closedfixed 315656 support complete ocl closedfixed 316192 aliases used in oclinecore constraints are. Useocl use ocl is a system for the specification and validation of information systems based on a subset of the unified modeling language uml and the object constraint language ocl.
An adaptable ocl engine for validating models in different tool. Ocl was introduced as a part of uml in 1997 as a business modeling language by ibm. Ocl allows users to navigate class diagrams, to formulate queries, and to restrict class diagrams with integrity constraints. The object constraint language ocl, which forms part of the uml set of modeling notations, is a precise, textual language for expressing constraints that cannot be shown diagrammatically in uml. Object constraint language formal language for expressing constraints over a set of objects and their attributes part of the uml standard used to write constraints that cannot otherwise be expressed in a diagram declarative no side effects no control flow based on sets and multi sets.
The object constraint language ocl started as a com plement of the uml notation with the goal to overcome the limitations of. Does anyone know good object constraint language ocl. We present an approach for the validation of uml models and ocl constraints that is. A pratical application of the object constraint language ocl. Modelbased assertion dl df fll warmer and kleppe define a constraint as follows. The object constraint language ocl is a declarative language for describing rules that apply to unified modeling language uml models developed at ibm.
Ocl as specification language for object constraints. This paper reflects on a number of aspects of the syntax and semantics of the ocl, and makes proposals for clarification or extension. Ocl was first developed in 1995 inside ibm as an evolution of an expression language in the syntropy method 26. There are certain rules that cannot be expressed using a schema language alone. The object constraint language ocl started as a complement of the uml notation with the goal to overcome the limitations of uml and in general, any graphical notation in terms of precisely. An interactive tool for specifying, validating and.
In view of this, ibm has proposed the object constraint language ocl as the uml standard specification language. Jos warmer is the primary author of the ocl standard. Pdf a formal language which is used to describe expressions on unified modelling language. A librarybased approach to translating ocl constraints to. A constraint is a restriction on one or more values a constraint is a restriction on one or more values of part of an objectoriented model or system. Warmer, kleppe, selic, gorman,yong he, amyot, brugge and dutoit, bultan, lings, lieber. Object constraint language formal060501 object management.
Previously he was a member of the uml core team, where he was responsible for the development of the object constraint language ocl. The documentation includes examples and tutorials which remain valid after a refresh for mars. Please report any encountered bugs using the ticket system. Object constraint language article about object constraint. Ocl specifications are commonly referred to as constraints. This page is about the meanings of the acronymabbreviationshorthand ocl in the computing field in general and in the software terminology in particular. Documentation is available via wikitext as a pdf monolith, html files or eclipse help. However, use of the ocl specified by iso iec 19501.
Ocl may now be used with any meta object facility mof object management group omg metamodel, including uml. Ocl is a typed language, so that each ocl expression has a type. Use is a system for the specification and validation of information systems based on a subset of the unified modeling language uml and the object constraint language ocl. Zu einem umlmodell kann es viele oclbedingungen geben.
Properties can be combined to make more complicated expressi ons. He is an active member of the unified modeling language uml revision task force, which defined the revisions in the uml 2. After obtaining a result, one can always apply another property to the result to get a new result value. Quiting use without saving the current layount will create the file. Introduction to the object constraint language tutorial. Ocl object constraint language part of the uml standard. The object constraint language ocl started as a com. Pdf case study of object constraints language ocl tools. The object constraint language ocl is a specification language which. Reflections on the object constraint language pdf ali hamie, franco civello, john howse, stuart kent and richard mitchell the object constraint language ocl, which forms part of the uml set of modeling notations, is a precise, textual language for expressing constraints that cannot be shown diagrammatically in uml. A constraint is a restriction on one or more values a constraint is a restriction on one or more values of part of an object oriented model or system. Parts of the syntax seem to have been influenced by smalltalk disclaimer opinions expressed here may be out of date. The object constraint language is a precise text language that provides constraint and object query expressions on any mof model or metamodel that cannot otherwise be expressed by diagrammatic notation. Code generation is supported for both uml model and ocl files.
Object constraint language oclhas not gone unscathed 2, 9, 10, 12, 26, 52. Object constraint modelbased assertion dldf fllwarmer and kleppe define a constraint as follows. Initially, ocl was merely a formal specification language extension for uml. Ocl is part of unified modeling language uml and it plays an important role in the analysis phase of the software lifecycle. All books are in clear copy here, and all files are secure so dont worry about it. Natural language text is used to explain the background and motivation of the models.
It can be used to express additional constraints on uml models that cannot or are difficult to be expressed graphically. Object constraint language specification 6 this chapter introduces and defines the object constraint language ocl, a formal language to express sideeffectfree constraints. However, in many cases, a graphical model like a class diagram, is not enough for a precise and unambiguous. For years, researchers in software product lines splsexplored generalizations. It is a bad practice to use this file, especially when various diagrams are to be build. The object constraint language ocl is a textual, formal specification language for specifying the semantics of uml models. Object constraint language this specification defines the object constraint language ocl, version 2. Object constraint language ocl cheat sheet ocl syntax. The context objects may be denoted within the expression using the keyword self. The object constraint language ocl started as a complement of the uml notation with the goal to overcome the limitations of uml and in general, any. Constraint invariant is a boolean ocl expression, evaluates to truefalse. The object constraint language ocl is frequently used to specify additional constraints on models, in addition, to the ones enforced by semantics of the models. The object constraint language ocl is a declarative language describing rules applying to.
Object constraint language ocl ocl is a formal language used to describe expressions on uml models. Object constraint language language ocl a formal specification language extension to uml. Therefore, each ocl expression can be read and evaluated lefttoright. The object constraint language is a precise text language that provides constraint and object query expressions on an object oriented model that cannot otherwise be expressed by diagrammatic notation. It is implemented as a shallow embedding of ocl into the higherorder logic hol instance of the interactive theorem prover isabelle. Ever since its inception, the actual use of ocl in the industry has been almost negligible, even amongst the business application development community, for which it was specifically created. This prototype shows how ocl rules embedded in the nist 1500 models can be. This specification defines the object constraint language ocl, version 2. The ocl file stores some kind of data stored in object constraint language. Ob diese in einer oder mehreren dateien verwaltet werden, ist im prinzip.
One can use ocl to express, for example, requirement that a specification should contain an even number of commands example 2. As part of this process we encourage readers to report any ambiguities, inconsistencies, or inaccuracies they may find by completing the issue reporting form listed. The ocl file extension is associated with the object constraint language a declarative language for describing rules that apply to unified modeling language uml models, developed by ibm. What links here related changes upload file special pages permanent link page. The object constraint language ocl appeared as an e. Ocl supplements uml by providing expressions that have. Context object may be denoted within the expression using the keyword self. Mar 21, 2012 the object constraint language ocl started as a complement of the uml notation with the goal to overcome the limitations of uml and in general, any graphical notation in terms of precisely specifying detailed aspects of a system design. The object constraint language ocl is an expression language that. Contents this chapter contains the following topics.
Object constraint language object management group. Constraint that applies to all instances of class or type or interface an expression that evaluates to true if the condition is met. Extracting umlocl integrity constraints and derived types. Founded in 1989, omg standards are driven by vendors, endusers, academic institutions and government agencies. Hol ocl is an interactive proof environment for the object constraint language ocl. Ocl expressions typically specify invariant conditions that must hold for the system being modeled. Aug 23, 2018 the object constraint language ocl is an omg standard for specifying constraints on, amongst others, metamodels.
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