EN 81714-2-2007 产品技术文件用图形符号的设计.第2部分:适合计算机感应的图形符号,包括用于参考库的图形符号规范及其交换规范
Design of Graphical Symbols for Use in the Technical Documentation of Products - Part 2: Specification for Graphical Symbols in a Computer Sensible Form, Including Graphical Symbols for a Reference Library, and Requirements for Their Interchange