| http://www.w3.org/ns/prov#value | - If the question is why make Dog abstract when it could be concrete, have a virtual bark defined with a default implementation that can be overriden?, the answer would be that this may be acceptable sometimes -- but, from a design perspective, there really is not any such thing as a Dog that is not a Collie or a Beagle or some other breed or mix so although they are all Dogs, there is not one of th
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