GB/T 17564.5-2007 in English

《GB/T 17564.5-2007电气元器件的标准数据元素类型和相关分类模式 第5部分: EXPRESS 字典模式扩展》由TC27（全国电气信息结构、文件编制和图形符号标准化技术委员会）归口，TC27SC4（全国电气信息结构、文件编制和图形符号标准化技术委员会电气元件数据库用数据集分会）执行，主管部门为国家标准化管理委员会。
本标准等同采用IEC 61360-5：2004。本标准用于GB/T 17564.1、GB/T 17564.2中规定的信息模型中没有规定的概念定义的公共ISO/IEC 字典模式扩展，目的是为符合上面给出范围的数据提供形式模型，并因此和GB/T 17564.2一起为符合GB/T 17564.1的所有数据的计算机可识别表示和交换提供手段。

Scope

This part of GB/T 17564 is used for public ISO/IEC dictionary schema extensions that are not specified in the information model specified in GB/T 17564.1-2005 and GB/T 17564.2-2005. The purpose of this standard is to provide a formal model for data conforming to the scope given above, and therefore, together with GB/T 17564.2-2005, provide means for computer-readable representation and exchange of all data conforming to GB/T 17564.1-2005. The public IS0/IEC dictionary schema defined in GB/T 17564.2 is based on the public IS0/IEC dictionary schema at the intersection of the scope of the following two basic standards: - IEC 61360-1: - IS0 13584-42. And facilitate the coordination of the two. The relevant parts citing the scope and purpose of IEC 61360-l are: This part of IEC 61360 provides a solid basis for defining precisely and unambiguously the characteristic properties (data element types) of basic elements, assemblies and even whole systems in all electrotechnical systems. Base. Although originally intended to provide the basis for information exchange for electronic/electrical components, the principles and methods of this part can be used in wider areas, such as: component assemblies and electrotechnical systems and subsystems. The relevant part citing the introduction of IS0 13584-42 is: This part of IS0 13584 provides rules and guidelines for database data suppliers to create part family hierarchies according to a common method, so that the database construction methods of many suppliers are consistent . These rules are as follows: methods for grouping parts in each part family to form a hierarchical structure; dictionary elements describing the characteristics of each part family and each part. IEC 61360-2 provides a common information model for the work of the two committees, which allows the part of the dictionary system implementation that involves data transmission to be based on the specific standards of either committee. Together with the resources of GB/T 17564.2, IS0 13584 and IS0 10303, this part of GB/T 17564 provides the Library Integrated Information Model (LIIM), allowing dictionary information modeling and exchange in accordance with GB/T 17564.1-2005.