[Crm-sig] subproperty - superproperty
nickcrofts at yahoo.com
Tue Jun 12 17:32:06 EEST 2007
IMHO yes, you can indeed have instances of Pa:Ek <--> El that are not instances of Pb.
An example : The current or previous location (P53) of a material object (E19) isn't necessarily an instance of current location (P55).
Christian-Emil Ore <c.e.s.ore at edd.uio.no> wrote:
I may well be blind, but I cannot find the following specified in the
Assume we have four class (could be two) Ei, Ej, Ek, El and two
properties Pa, Pb
Ek is a sub class of Ei
El is a sub class of Ej
Pa: Ei <-> Ej
Pb: Ek <-> El
which can be illustrated by the diagram
Ei <----> Ej
| | |
| | |
| | |
Ek <----> El
It is clear that each instance of a Pb will be a Pa when seen as a
property on the superclass level. That is ordinary object orientedness
and well documented in the crm standard.
Since Ek and El are subclasses of Ei and Ej, the properties between Ei
and Ej, that is, Pa will also be a property between Ek and El. However,
can there exist an instance of Pa:Ek <--> El that is not an instance of Pb?
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