ISO 10303-21:1994 Industrial automation systems and integration - Product data representation and exchange - Part 21: Implementation methods: Clear text encoding of the exchange structure
2016ISO 10303-21:2016 Industrial automation systems and integration - Product data representation and exchange - Part 21: Implementation methods: Clear text encoding of the exchange structure
2002ISO 10303-21:2002 Industrial automation systems and integration - Product data representation and exchange - Part 21: Implementation methods: Clear text encoding of the exchange structure
2001ISO 10303-21:2001 Industrial automation systems and integration -Product data representation and exchange-Part 21:Implementation methods-Clear text encoding of the exchange structrue
1996ISO 10303-21:1994/Cor 1:1996 Industrial automation systems and integration - Product data representation and exchange - Part 21: Implementation methods: Clear text encoding of the exchange structure; Technical Corrigendum 1
1994ISO 10303-21:1994 Industrial automation systems and integration - Product data representation and exchange - Part 21: Implementation methods: Clear text encoding of the exchange structure