Dear All,Attached my attempt to redefine Observable Entity so that we can measure distances between things!
If you do not open the attached, here the summary:I reconsider Observation, Observable Entity and Situation in the light of the question, how to define Position Measurement. This leads to measuring distances as a “primitive”. Since this must be an observation, the fundamental problem that appears is that observations may pertain to constellations of multiple things.
Therefore:The properties O9, O16 are problematic and too restrictive. Situation as a proposition set holding at a particular time is more adequate, may be a straight-forward generalization.
O9 observed property type (property type was observed by): S9 Property Type O16 observed value (value was observed by): E1 CRM Entity We should introduce: Oxxx observed situation (was observed by): Sxxx Observable SituationAn “Observable Situation” would be a proposition set relating Observable Entities, with a validity time-span that must be within the time-span of the observation. To be elaborated. Examples: People talking to each other, vehicles approaching each other, a vehicle moving in direction x with speed y etc.
E13 can manage only one property at a time. Therefore, S4 Observation is not a subclass of E13 Attribute Assignment.
We may need to consider an S4 Observation consisting of multiple Attribute Assignments. We can regard each propositions in the observed Sxxx Observable Situation to be result of an E13 Attribute Assignment. This can then gracefully collapse to a one-property observation.
This works, if restricting cardinality is a specialization ???Then, an Observable Entity has a Dimension. In case of distances however, two observable entities share one Dimension. If we can formulate Dimension as a kind of Observable Situation (adding time and restricting cardinality), we can manage the generalizations.
Best, Martin -- ------------------------------------ Dr. Martin DoerrHonorary Head of the
Center for Cultural InformaticsInformation Systems Laboratory
Institute of Computer Science Foundation for Research and Technology - Hellas (FORTH)N.Plastira 100, Vassilika Vouton,
GR70013 Heraklion,Crete,GreeceVox:+30(2810)391625
Email: [email protected] Web-site: http://www.ics.forth.gr/isl
Issue_531.docx
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