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+* it would be great to have time-based proprties, aspects, business systems, etc.
+* it might prove useful to provide a way to link otherwise unrelated things (e.g., properties) together so that
+  if one is deleted, the other is.
+* inverse fuction? not sure how often such would be useful other than in debugging, but would it be plausible to incorporate backward
+  links so that it would be possible to easily query a property to learn all entities, aspects, etc. that it is a part of?