The ISKINDOF operator

SYNTAX:
 
rel_op_extended = rel_op | IN | LIKE | IS | ISKINDOF.
The EDMexpressX^ defines the ISKIND operator. It is used to determine if a particular instance is of a specific entity type or one of the subtypes of the given entity . The ISKINDOF operator returns a Boolean value.
When an instance can be one of many types, the ISKINDOF operator has to be used for these possible types until TRUE is returned.
E.g.(anInstance ISKINDOF Person will match when (anInstance IS Man and Man is a subtype of Person.