17.11. Period of Time and Possible Worlds
Figure 17-11 shows the data model for period_of_time and possible_world . A period_of_time is all of space between one point_in_time and another, and so it is a temporal_part_of a possible_world (possible world should probably be called possible universe, but the convention is to call it a possible world).
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Figure 17-11
HQDM_FRAMEWORK EXPRESS-G diagram 11 of 46.
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A period_of_time may be a member_of one or more class_of_period_of_time and a possible_world may be a member_of one or more class_of_possible_world .
17.11.1. Class_of_period_of_time
A class_of_state that is period_of_time ...
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