Respuesta :
An entity supertype can inherit the characteristics and connections of a subtype thanks to the trait of a subtype discriminator. It's true.
A subtype is a datatype that is related to another datatype (the supertype) by some notion of substitutability, meaning that program elements, typically subroutines or functions, written to operate on elements of the supertype can also operate on elements of the subtype.
This is known as subtyping, also known as subtype polymorphism or inclusion polymorphism. in every scenario where a term of type T is expected, any term of type S can be employed without risk. Here, the specifics of how "safely be used" and "any context" are specified by a certain type system or programming language are significantly important for understanding the semantics of subtyping. In essence, a computer language's type system establishes its own subtyping relation.
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