信息技术.CDIF框架.第2部分:建模和可扩展性

[中文适用范围]： CDIF 系列标准主要设计用于描述在建模工具之间传输信息的机制。 当导入和导出工具的作者除了遵守 CDIF 的协议之外没有任何共同点时，它有助于成功转移。 CDIF 标准系列包括语义元模型和传输格式定义。 它还包括元元模型和相关规则的规范，这些规则定义了语义元模型和传输格式的框架。 为传输格式定义的语言也可用作存储库导入/导出的通用语言。 CDIF 语义元模型还适用于作为存储库中使用的标准定义的基础。 构成 CDIF 标准完整系列的标准记录在 ISO/IEC 15474-1:2002，信息技术 - CDIF 框架 - 第 1 部分：概述中。 这些标准涵盖了总体框架、传输格式和CDIF语义元模型。 图 1 中的图表描述了组成 CDIF 标准系列的各种标准。 阴影框描述了该标准及其在 CDIF 标准系列中的位置。 本文档（ISO/IEC 15474-2:2002，信息技术 - CDIF 框架 - 第 2 部分：建模和可扩展性）包含 CDIF 元元模型的定义，并描述整个 CDIF 标准系列中使用的规则和符号。 还定义了扩展 CDIF 语义元模型的规则。 本文档旨在供任何希望了解和/或使用 CDIF 的人使用。 本文档介绍了整个 CDIF 标准系列。 它适合： ——评估 CDIF 的人员， — 希望了解 CDIF 转让的原则和概念的人员，以及 — 发展中的进口商和出口商。 文件 ISO/IEC 15474-1:2002，信息技术 - CDIF 框架 - 第 1 部分：概述，以及本框架文件 ISO/IEC 15474-2:2002，信息技术 - CDIF 框架 - 第 2 部分：建模和可扩展性，应在最初探索 CDIF 时以及尝试阅读 CDIF 标准系列中的其他文档之前，请首先阅读。 虽然阅读本文档没有特定的先决条件，但熟悉以下内容将有助于读者： ——实体-关系-属性建模； ——建模（CASE）工具； ——信息存储库； ——数据字典； ——多个元层建模。 [外文原描述]： The CDIF family of standards is primarily designed to be used as a description of a mechanism for transferring information between modelling tools. It facilitates a successful transfer when the authors of the importing and exporting tools have nothing in common except an agreement to conform to CDIF. The CDIF family of standards includes a semantic metamodel and a transfer format definition. It also includes the specification of a meta-metamodel and associated rules that define a framework for the semantic metamodel and the transfer format. The language that is defined for the transfer format also has applicability as a general language for Import/Export for repositories. The CDIF semantic metamodel also has applicability as the basis of standard definitions for use in repositories. The standards that form the complete family of CDIF Standards are documented in ISO/IEC 15474-1:2002, Information technology - CDIF framework - Part 1: Overview. These standards cover the overall framework, the transfer format and the CDIF semantic metamodel. Figure 1 − CDIF family of standards The diagram in Figure 1 depicts the various standards that comprise the CDIF family of standards. The shaded box depicts this Standard and its position in the CDIF family of standards. This document (ISO/IEC 15474-2:2002, Information technology - CDIF framework - Part 2: Modelling and extensibility) includes the definition of the CDIF meta-metamodel and describes the rules and notations used throughout the CDIF family of standards. The rules for extending the CDIF semantic metamodel are also defined. This document is intended to be used by anyone wishing to understand and/or use CDIF. This document provides an introduction to the entire CDIF family of standards. It is suitable for:  Those evaluating CDIF,  Those who wish to understand the principles and concepts of a CDIF transfer, and  Those developing importers and exporters. The document, ISO/IEC 15474-1:2002, Information technology - CDIF framework - Part 1: Overview, and this framework document ISO/IEC 15474-2:2002, Information technology - CDIF framework - Part 2: Modelling and extensibility, should be read first when initially exploring CDIF and before attempting to read other documents in the CDIF family of standards. While there are no specific prerequisites for reading this document, it will be helpful for the reader to have familiarity with the following:  Entity-Relationship-Attribute modelling;  Modelling (CASE) tools;  Information repositories;  Data dictionaries;  Multiple meta-layer modelling.