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- From: Dan Brickley <Daniel.Brickley@bristol.ac.uk>
- To: "'xml-dev@ic.ac.uk'" <xml-dev@ic.ac.uk>
- Date: Tue, 4 May 1999 15:10:49 +0100 (BST)
On Tue, 4 May 1999, Roger L. Costello wrote:
> Note that SLR is a subClass of Camera. In the definition of the f-stop
> property I indicate what domains the property may be used in - Camera
> and SLR. My question is this: since SLR is a subclass of Camera then
> can I omit the second domain property[...]
> f-stop can be used in any sublasses of Camera and I don't have to
> specify all the subclasses that it may be used in. Correct? /Roger
Yes. If you say that f-stop has a domain of class 'Camera', you're
claiming that it makes sense (ie. is consistent) to apply f-stop
properties to resources that are members of that class. "Sub-class" just
says that one set of resources is a subset of another. So we know that
if a resource is of type SLR, and all SLRs are Cameras (ie.
SLR--subClassOf-->Camera), then that resource is also a camera. And if
its a camera, we can use properties applicable to cameras on it.
Dan
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