]> AKT Reference Ontology (Support Ontology) AKT Reference Ontology (Support Ontology) The AKT Reference Ontology has been designed to support the AKT-2 demonstrator ("AKTive Portal"), and subsequent activities. The ontology, designed by the AKT-2 group and codified by Enrico Motta, extends Version 1. AKT Project Enrico Motta (OCML version) Nick Gibbins (DAML+OIL translation) 2003-06-28 2.0 Thing This is the top-level concept in the AKT reference ontology has pretty name A human readable name has variant name Other variants of the human readable name Intangible Thing This comes from HPKB upper level. The collection of things that are not physical - are not made of, or encoded in, matter. Every Collection is an Intangible (even if its instances are tangible), and so are some Individuals. Caution: do not confuse `tangibility' with `perceivability' - humans can perceive light even though it's intangible - at least in a sense. Temporal Thing Like in Cyc, this is something which has a temporal extent. has time interval Tangible Thing Something which is not intangible, something which is physical, made of matter. It does not matter whether things are real of imaginary. Therefore we consider Mickey Mouse's car and a hippogriff as tangible things Quantity From SUO: Any specification of how many or how much of something there is. Accordingly, there are two subclasses of Quantity: Number (how many) and Physical-Quantity (how much). Physical Quantity SUO: Physical Quantities are distinguished from Numbers by the fact that the former are associated with a dimension of measurement. has magnitude has unit of measure Unit of Measure Any kind of unit of measure, metre, dollar, kilogram, etc. Time Position A time position is either a time interval or a time point. Any time position is relative to a time zone in timezone Time Point A point in time 1 1 1 1 1 1 second of minute of hour of day of month of year of Calendar Date A point in time 0 0 0 1 1 1 Time Interval An interval is defined by two time points or a duration. Classes of intervals, e.g., a day, can be defined by specifying only a duration. A time interval has no gaps begins at time point ends at time point has duration Day Week Month Year Duration A measure of time, e.g., 5 hours 24 hour duration 7 day duration 28 day duration 29 day duration 30 day duration 31 day duration 12 month duration Time Measure The class of all unit of measures used to measure time, e.g., minute, second, hour, etc. second minute hour day month year