]> 2.0 Cui Tao Mayo Clinic Clinical Narrative Temporal Relation Ontology Event(?e1), hasValidTime(?e1, ?t1), hasNormalizedTime(?t1, ?nt1), ValidTime(?t2), hasNormalizedTime(?t2, ?nt2), (?nt1, ?nt2) -> before(?e1, ?e2) 事件(e1)、事件(e2), hasValidTime (?e1, t1)NormalizedTime(?t1, ?nt1), hasValidTime(?e2, ?t2), hasNormalizedTime(?t2, ?nt2), (?nt1, ?nt2) -> after(?e1, ?e2) 事件(e1)、事件(e2), hasValidTime (?e1, t1)NormalizedTime(?t1, ?nt1), hasValidTime(?e2, ?t2), hasNormalizedTime(?t2, ?nt2), (?nt1, ?nt2) -> before(?e1, ?e2) Event has time a temporal relations statement is a subclass of rdf:statement. it is a statement to define the temporal relation between to clinical events Periodic Interval of Time