Standard data element types with associated classification scheme -- Part 1: Definitions - Principles and methods ( IEC 61360-1:2017) (english version)
Industrial automation systems and integration -- Product data representation and exchange – Part 11: Description methods: The EXPRESS language reference manual— 270 стр.
Industrial automation systems and integration -- Parts library -- Part 42: Description methodology: Methodology for structuring parts families— 240 стр.