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parent_typeIn Deriscope terminology, a parent type is a Deriscope Type P that has the following relationship to a given type T.
T is a child type of P.
In case the concept of child type is not yet defined, the required relationship can be also described as:
The family of all potential member Deriscope Objects of P includes the respective family of T as a subset.
For example, the type Tradable is a parent type of the type Currency as the family of all Tradable objects icludes all Currency objects.