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TypeOf

TypeOf::class[symbol]
checks, if symbol is class or a class derived directly or indirectly from class. While TypeOf tests classes, InstanceOf tests objects.
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Basic Examples   (1)
This loads the package.
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The next cell generates a tiny class hierarchy.
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We now test for types. grandchild and greatgrandchild have child as (indirect) parent and are therefore also of type child. Analogously, greatgrandchild is also a grandchild.
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Objects are not recognized by TypeOf.
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Any other "class" yields False.
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Please observe that the ::-operator acts on the scond argument rather quickly. Therefore, the following fails.
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