3SUH S H, LEE B E, CHUNG D H, et al. Architecture and implementation of a shop floor programming system for STEP- compliant CNC[J]. Computer-Aided Design, 2003, 35(12):1069-1083.
4ISO. ISO14649/FDIS Data model for computerized numerical controllers[S]. Geneva, Switzerland : ISO, 2001.
5ISO/TC184/SC1/WG7. ISO/FIS 10303-238 Application interpreted model for computerized numerical controllers[EB/OL]. [2004-06-09]. http://www, steptools, com/library/stepnc/ tech-resources/wg3n1460-ap238-draft, pdf.