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Property::isDerivedUnion : Boolean [1..1] = false Specifies whether the property is derived as the union of all of the Properties that are constrained to subset it.

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A ValueSpecificationAction may not have any InputPins, because Action::/input:InputPin[0..*] is a derived union, and ValueSpecificationAction does not specify any InputPin subsets
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Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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Property
Property::isDerivedUnion
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isDerivedUnion : Boolean [1..1] = false

Specifies whether the property is derived as the union of all of the Properties that are constrained to subset it.

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A Property may be marked as being a derived union, by setting isDerivedUnion to true. This means that the collection of values denoted by the Property in some context is derived by being the strict union of all of the values denoted ...
A Property may be marked as the subset of another subsettedProperty. In this case, calculate a set by eliminating duplicates from the collection of values denoted by the subsetting property in some context.
Property::subsettedProperty : Property [0..*] ... The properties of which this Property is constrained to be a subset, if any.
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