BS EN 81714-2:1999 产品技术文件中用的图形符号的设计.计算机适用的图形符号(包括参考目录图形符号及其互换要求)的规范
Design of graphical symbols for use in the technical documentation of products - Specification for graphical symbols in a computer sensible form, including graphical symbols for a reference library, and requirements for their interchange