Terms describing validation rules Validation.Exclusive Validation.Exclusive Core.SymbolicName Example: entity type `Customer` has navigation properties `AllOrders`, `OpenOrders`, and `ClosedOrders`. The term allows to express that items of `OpenOrders` and `ClosedOrders` are also items of the `AllOrders` navigation property, even though they are defined in an `Orders` entity set. This allows restricting values to certain sub-trees of an inheritance hierarchy, including hierarchies starting at the [Built-In Abstract Types](https://docs.oasis-open.org/odata/odata-csdl-json/v4.01/odata-csdl-json-v4.01.html#sec_BuiltInAbstractTypes). Types listed in this collection are ignored if they are not derived from the declared type of the annotated model element or would not be allowed as declared type of the annotated model element. When applied to a collection-valued element, this annotation specifies the types allowed for members of the collection without mentioning the `Collection()` wrapper. The SingleOrCollectionType may only include the `Collection()` wrapper if the annotation is applied to an element with declared type `Edm.Untyped`.