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Although the name
6_valueproperties_compositeof this constraint suggests it is only intended for value properties, the text of the constraint implies that a FlowProperty typed by a ValueType should also have AggregationKind composite:
SysML-1.6: 'Block::6_valueproperties_composite: If a property owned by a SysML Block or SysML ValueType is typed by a SysML ValueType, then the aggregation attribute of the property shall be "composite."'
self.base_Class.ownedAttribute->select(a| ValueType.allInstances().base_DataType ->includes(a.type))->forAll(a|a.isComposite())
Note also that the following specification text on p.53 (under 126.96.36.199 Block) if taken literally would mean that any FlowProperty typed by a ValueType is a value property: