]> 0.4 COBRA-ONT Time Ontology This ontology defines concepts for describing time. The basic constructs are time instant and time interval. Both time instant and time interval are type of temporal entity, which can be described using the calendar/clock ontology. Parts of this ontology are adopted from the time-entry ontology (developed by Feng Pan and Jerry R. Hobbs (USC/ISI)) and the DAML-Time ontology. TemporalThing InstantThing IntervalThing ProperIntervalThing TemporalEntity Instant Interval ProperInterval Event TemporalEvent InstantEvent IntervalEvent IntervalEvent before after begins begins begins hasInstantDatatypeDescription Defines a datatype representation of a time instant. hasIntervalDatatypeDescription Defines a datatype representation of a time interval. IntervalDatatypeDescription When a time interval is described by using XML datatypes, the beginning of the time interval is defined by the datatype property "beginningTime", and the end of the time interval is calculated by adding the duration specification (i.e., the value that is defined by the property "duration") to the value that is defined by "beginningTime". 1 1 duration beginningTime hasInstantDescription InstantDescription 1 1 definedByCalendar definedByClock hasIntervalDescription IntervalDescription 1 1 firstInstantDescription secondInstantDescription