DBStructDef :: IsBasedOn - Does structure inherit from passed type
The function returns whether the type definition is a specialization of the type passed in sTypeName ( true ) or not ( false ). In contrast to inherits() , the function returns false , when the type is identical with the type name passed. The function does not check, whether the type name passed is a valid type.
When calling the function with an invalid type definition (e.g. key definition), the function throws an exception.
Return value: Return value ( logical )
The function returns YES when the question was answered positively. Otherwise it returns NO .