Is-a
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In knowledge representation, object-oriented programming and design (see object oriented program architecture), is-a (is_a or is a) is a subsumption relationship between abstractions (e.g. types, classes), where one class A is a subclass of another class B (and so B is a superclass of A). In other words, type A is a subtype of type B when A’s specification implies B’s specification. That is, any object (or class) that satisfies A’s specification also satisfies B’s specification, because B’s specification is weaker.
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See also
- Inheritance (object-oriented programming)
- Liskov substitution principle (in object-oriented programming)
- Subsumption
- Is-a
- Has-a
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