Mapping of Supertype / subtypes

Supertype / subtype entities

Population results in ‘complex entity instances’.

Two ‘Mapping Rules’ defined

Internal mapping
External mapping
Selection depends on which (STEP Part 21) Conformance Class selected (and stated in HEADER section).
If Conformance Class 1 selected
Use Internal mapping for single inheritance graphs and
External mapping for multiple inheritance graphs
If Conformance Class 2 selected
Use External mapping for all ‘complex entity instances’

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