OptionalCoefficientOptionalDescriptionOptionalGlobalOptionalNameOptionalObjectRequired by the combined HasObjectType WHERE rule when PredefinedType/ActionType/ActionSource is 'USERDEFINED'.
OptionalPredefinedOptionalPurposeOptionalSelfExactly 3 ratios [x, y, z]. Presence emits IfcStructuralLoadCase
instead of IfcStructuralLoadGroup and forces PredefinedType to
'LOAD_CASE' (see the EXPRESS WHERE rule in the module doc) — passing
both this AND a conflicting PredefinedType is refused rather than
silently overridden.
Explicit GlobalId (22-char IFC GUID); generated when omitted.