Map, a set of descriptors of those container element types is returned, which are constrained or marked with
Valid. A container element type is constrained, if it hosts at least one constraint.
In the context of properties and method return values, container element types of super-types are considered.
Valid. An empty set will be returned if this element is not of a container type or is of a container type but there are no container element types hosting constraints or marked with
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