I am looking into SPIN to compute derived quantities in an analytical model. I studied the blog on magic properties, and tried it out the grandParent magic property on kennedys.owl and it works as promised. I understand that these magic properties are intended to extend SPARQL, however, since they are properties, could they be extended to be used for late binding properties on objects, so that the values could be computed on access? I tried unsuccessfully to do this, and concluded that were not meant to be used in this way and that I should use spin rules for computing derived properties on objects. Is that correct?
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