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【计算机专业文献翻译】OMG统一建模语言规范

【计算机专业文献翻译】OMG统一建模语言规范
【计算机专业文献翻译】OMG统一建模语言规范

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OMG Unified Modeling Language Specification

Preface

0.1 About the Unified Modeling Language (UML)

The Unified Modeling Language (UML) provides system architects working on object analysis and design with one consistent language for specifying, visualizing, constructing, and documenting the artifacts of software systems, as well as for business modeling.

This specification represents the convergence of best practices in the object-technology industry. UML is the proper successor to the object modeling languages of three previously leading object-oriented methods (Booch, OMT, and OOSE). The UML is the union of these modeling languages and more, since it includes additional expressiveness to handle modeling problems that these methods did not fully address.

One of the primary goals of UML is to advance the state of the industry by enabling object visual modeling tool interoperability. However, in order to enable meaningful exchange of model information between tools, agreement on semantics and notation is required. UML meets

the following requirements:

? Formal definition of a common object analysis and design (OA&D) metamodel to represent the semantics of OA&D models, which include static models, behavioral models, usage models, and architectural models.

?IDL specifications for mechanisms for model interchange between OA&D tools. This document includes a set of IDL interfaces that support dynamic construction and traversal of a user model.

? A human-readable notation for representing OA&D models. This document defines the

UML notation, an elegant graphic syntax for consistently expressing the UML’s rich semantics. Notation is an essential part of OA&D modeling and the UML.

0.2 About the Object Management Group (OMG)

The Object Management Group, Inc. (OMG) is an international organization supported by over 800 members, including information system vendors, software developers and users. Founded in 1989, the OMG promotes the theory and practice of object-oriented technology in software development. The organization's charter includes the establishment of industry guidelines and object management specifications to provide a common framework for application development. Primary goals are the reusability, portability, and interoperability of object-based software in distributed, heterogeneous environments. Conformance to these specifications will make it possible to develop a heterogeneous applications environment across all major hardware platforms and operating systems.

OMG's objectives are to foster the growth of object technology and influence its direction by establishing the Object Management Architecture (OMA). The OMA provides the conceptual infrastructure upon which all OMG specifications are based.

Contact the Object Management Group, Inc. at:

OMG Headquarters

492 Old Connecticut Path

Framingham, MA 01701

USA

Tel: +1-508-820 4300

Fax: +1-508-820 4303

pubs@https://www.doczj.com/doc/ab16678919.html,

https://www.doczj.com/doc/ab16678919.html,

OMG’s adoption of the UML specification reduces the degree of confusion within the industry surrounding modeling languages. It settles unproductive arguments about method

notations and model interchange mechanisms and allows the industry to focus on higher leverage, more productive activities. Additionally, it enables semantic interchange between visual modeling tools.

0.3 About This Document

This document is intended primarily as a precise and self-consistent definition of the UML’s semantics and notation. The primary audience of this document consists of the Object Management Group, standards organizations, book authors, trainers, and tool builders. The authors assume familiarity with object-oriented analysis and design methods. The document is

not written as an introductory text on building object models for complex systems, although it

could be used in conjunction with other materials or instruction. The document will become more approachable to a broader audience as additional books, training courses, and tools that apply to UML become available.

The Unified Modeling Language specification defines compliance to the UML, covers the architectural alignment with other technologies, and is comprised of the following topics: UML Summary (Chapter 1) - provides an introduction to the UML, discussing motivation and history.

UML Semantics (Chapter 2) - defines the semantics of the Unified Modeling Language. The UML is layered architecturally and organized by packages. Within each package, the model elements are defined in the following terms:

UML Notation Guide (Chapter 3) - specifies the graphic syntax for expressing the semantics described by the UML metamodel. Consequently, the UML Notation Guide’s chapter should be read in conjunction with the UML Semantics chapter.

UML Standard Profiles (Chapter 4) - defines the UML Profile for Software Development Processes and the UML Profile for Business Modeling.

UML CORBAfacility Interface Definition (Chapter 5) - uses CORBA IDL to specify a repository that enables the creation, storage and manipulation of UML models.

UML XMI DTD Specification (Chapter 6) - uses XML DTD to define a physical mechanism for interchanging UML models that conform to the UML metamodel.

Object Constraint Language Specification (Chapter 7) - defines the Object Constraint Language (OCL) syntax, semantics, and grammar. All OCL features are described in terms of concepts defined in the UML Semantics.

In addition, there is appendix of Standard Elements that defines standard stereotypes, constraints and tagged values for UML, and a glossary of terms.

0.3.1 Dependencies Between Chapters

UML Semantics (Chapter 2) can stand on its own, relative to the others, with the exception of the OCL Specification. The semantics depends upon OCL for the specification of its wellformedness rules.

The UML Notation Guide, UML CORBAfacility Interface Definition and UML XMI

DTD Specification all depend on the UML Semantics. Specifying these as separate standards will permit their evolution in the most flexible way, even though they are not completely independent.

The specifications in the UML Standard Profiles depend on both the notation and semantics chapters.

1. Abstract syntax UML class diagrams are used to present the UML metamodel, its concepts (metaclasses), relationships, and constraints. Definitions of the concepts are included.

2. Well-formedness rules The rules and constraints on valid models are defined. The rules are expressed in English prose and in a precise Object Constraint Language (OCL). OCL is a specification language that uses logic for specifying invariant properties of systems comprising sets and relationships between sets.

3. Semantics The semantics of model usage are described in English prose.

0.4 Compliance to the UML

The UML and corresponding facility interface definition are comprehensive. However, these specifications are packaged so that subsets of the UML and facility can be implemented without breaking the integrity of the language. The UML Semantics is packaged as follows:

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