The Situation Data Model of Tepfenhart (1992)
 
Source: Tepfenhart W.M. (1992). Using the Situation Data Model to Construct a Conceptual Basis Set.
        In Conceptual Structures: current research and practice (Eds: Nagle T.E., Nagle J.A., Gerholz L.L. & Eklund P.W.),
        England , Ellis Horwood Workshops, 1992.


Concept -- the supertype for all concept types

   Entity -- location, object, material, or property

      Location -- a place and/or a time which is occupied by an object
         Place -- a region of space (a point in space or a set of point in space)
         Time -- a period of time (a point in time or a set of point in time)

      Object -- thing which has a manifestation in the real world
         Abstract_object -- thing which has an individual conceptual  manifestation in the real world
            Extended_abstract_object -- its boundaries are  well defined, e.g. Military_service
            Localised_abstract_object -- its boundaries are  ill-defined  e.g. Currency, Time_zone
         Concrete_object -- thing which has an individual physical  manifestation in the real world
            Substantial_object -- its boundaries are well defined, e.g. a table, a car, an animal
            Insubstantial_object -- its boundaries are  ill- defined, e.g. a cloud

      Material -- a constituent substance of an object

      Property -- attribute, characteristic, feature, or capability of an object or material
         Attribute -- directly measurable physical property of an object or material
         Characteristic -- physical aspect of an object or material
         Feature -- limited surface aspect of an object
         Capability -- ability of an object  to perform actions

   Scene -- state of the world described in terms of the entities and the relationship
            that hold among them at a particular point in time
      State_of_affairs -- description of the world at an instant in time
      Locus_of_affairs -- scene  which serves as token for a number of concepts and relationships
                          which hold among them without change throughout a situation
      State_of_affairs -- description of the world at an instant in time

   Situation -- a denotation for a set of scenes and the actions which connect them
      Event -- a situation which consists of an initial scene, a final scene and an action which links the two
      Activity -- a situation with more than two scenes

   Value -- a  measure of comparison or a label; it can be numeric (e.g. 4) or symbolic (e.g. Longer)