信息技术.CDIF传输格式.第3部分:编码ENCODING.1

[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。 为传输格式定义的语言也可用作从存储库导入/导出的通用语言。 为建模工具定义的 CDIF 语义元模型也适用于作为存储库中使用的标准定义的基础。 这些标准构成了 CDIF 标准的完整系列，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。 本文档描述了 ISO/IEC 15475-2:2002，信息技术 — CDIF 传输格式 — 第 2 部分：语法 SYNTAX.1 中定义的标准 CDIF 传输语法的标准 CDIF 传输编码。 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。 初次探索时应首先阅读文件 ISO/IEC 15474-1:2002，信息技术 — CDIF 框架 — 第 1 部分：概述和 ISO/IEC 15474-2:2002，信息技术 — CDIF 框架 — 第 2 部分：建模和可扩展性CDIF 并在尝试阅读 CDIF 标准系列中的其他文档之前。 本文件应结合 ISO/IEC 15475-1:2002，信息技术 — CDIF 传输格式 — 第 1 部分：语法和编码的一般规则以及 ISO/IEC 15475-2:2002，信息技术 — CDIF 传输格式 — 一起阅读。 第 2 部分：语法 SYNTAX.1。 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； ——多元层建模； ——正式语法； ——传输格式。 [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 language that is defined for the transfer format also has applicability as a general language for Import/Export from repositories. The CDIF semantic metamodel defined for modelling tools also has applicability as the basis of standard definitions for use in repositories. The standards, which 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 − Position in the 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 describes the standard CDIF Transfer Encoding for the standard CDIF Transfer Syntax as defined in ISO/IEC 15475-2:2002, Information technology —CDIF transfer format — Part 2: Syntax SYNTAX.1. 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 documents ISO/IEC 15474-1:2002, Information technology — CDIF framework — Part 1: Overview and 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. This document should be read in conjunction with ISO/IEC 15475-1:2002, Information technology — CDIF transfer format — Part 1: General rules for syntaxes and encodings and ISO/IEC 15475-2:2002, Information technology — CDIF transfer format — Part 2: Syntax SYNTAX.1. 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; — Formal grammars; — Transfer formats.