Time-dependent (entity type)
Time-dependent signifies that an entity type or its entities may or may not exist depending on the time or time period.
The entity type Plant material-Consumption is an example of a time-dependent entity type. Plant material-Consumption contains the amount of plant material consumed within a specified time period. Since the consumption data for a particular period of time is not known until this time period has expired, no entries can exist for the current time period.