Usage guide of the STEP PDM schema V1.2

Release 4.3 Jan 2002. Usage guide goal: to describe the recommended structure and attribute population for particular instance models created from the EXPRESS entities and types defined by the STEP PDM Schema. The selected instance models illustrate how to encode data values that need to be exchanged in support of key industry requirements common across the product manufacturing domain. Note: AP233 contains within it all of the PDM schema

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