833+;;Quote: can model time as a sequence of states, as date stamps in a database, as temporal relations

833 ;;Quote: most philosophical work on time are point-based theories instead of intervals

834 ;;Quote: though we can refer to times as points or intervals, most temporal references are implicitly stated by tense and event relationships

834 ;;Quote: events occur over an interval, so time associated with events can be decomposed; point times not useful

835 ;;Quote: the temporal relations are before, equal, meets, overlaps, during, starts, finishes, containment and their complements

835 ;;Quote: assumes that the temporal network contains all temporal relations and their consequences

838 ;;Quote: store temporal intervals within reference intervals; complete relationships within a reference interval; inter-interval relationships outside

840 ;;Quote: defines a hierarchy of reference intervals with NOW a variable bound to a particular reference interval; easy to track the present moment

841 ;;Quote: only disjunctive relationships between reference intervals (before, after); simplifies constraint propagation for temporal constraints