]> the cause of an Edge the effect of an Edge the value of a role or a property the event occurred no later than this time the event occurred no earlier than this time The event occurred exactly at this time. This is meant to be an abbreviation for an OTime where noEarlierThan and noLaterThan are identical. exactlyAt should be disjoint from noLaterThan U noEarlierThan. a piece of timing information associated with an event the time at which the agent began controlling the process the time at which the agent end controlling the process