273 ;;Quote: what is time? I know as long as no one asks me to explain it

275 ;;Quote: can model time with discrete (integers) or dense (reals) elements; discrete time points is more widespread

276 ;;Quote: the interaction between time and information is not straightforward nor well understood

276 ;;Quote: properties can be constant over time, time-varying, or themselves times

276 ;;Quote: an information management system needs a unique id or key for objects; time-invariant

276 ;;Quote: multiple relationships between time and information; e.g., time of event and time of database transaction

277 ;;Quote: an event has preconditions, triggering conditions, a resulting action, and a time of occurrence

277+;;Quote: events model the interaction between an enterprise and its environment

277 ;;Quote: the conceptual schema of an information system varies over time

280 ;;Quote: time in the infological model was an index of recorded facts by time

281 ;;Quote: extrinsic time--every statement is embedded in the temporal context that it occurred

290 ;;Quote: conceptual modeling language uses time intervals and the predicate 'meets'; includes a full set of temporal relationships

290 ;;Quote: every CML object includes time intervals for model time (system's knowledge) and system time (system's belief about its knowledge)