Re: [Tm4j-developers] Association.ofType()

[Gerd M. <ge...@sm...>]

> C is only an association of type B. B is an instance of the class A, but A
> is not a superclass of C. Sounds confusing ? :)
> 
> The <instanceOf> element (which translates to the type or types attribute)
> specifies a class-instance relationship. Topic maps are a powerful
> information modelling tool because they allow a topic to be both a class and
> an instance of a class.
> 
> You can model the subclass-superclass relationship by using an association
> with the XTM-defined PSIs which you will find declared as constants in
> com.techquila.topicmap.PSI. To get the supertypes of a topic, you need to
> first go to its type(s) and then for each of them, traverse the
> subclass-superclass association to find superclasses.

Okay, sound reasonable. Interesting point: What happens with
cyclic dependencies ? E.g. A instanceof B, B instanceof C, 
C instanceof A. Nobody bars you to model this, but it could cause
problems while processing.

Best Regards,
Gerd

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Gerd Mueller                                    ge...@sm...     
SMB GmbH                                  http://www.smb-tec.com