POSC Specifications: Epicentre Version 3.0
Logical Data Model
ENTITY
TEMPORAL_PERIOD
(* Open *)
SUBTYPE OF
(
temporal_object
);
parent_period :
OPTIONAL
temporal_period
;
part_of_period :
OPTIONAL
temporal_period
;
INVERSE
child_period :
SET [0:?] OF
temporal_period
FOR
parent_period;
next_older_period :
SET [0:?] OF
temporal_period_period_bndry
FOR
next_younger_period;
next_younger_period :
SET [0:?] OF
temporal_period_period_bndry
FOR
next_older_period;
period_components :
SET [0:?] OF
temporal_period
FOR
part_of_period;
pty_geologic_age_range :
SET [0:?] OF
pty_geologic_age_range
FOR
temporal_period;
temporal_event :
SET [0:?] OF
temporal_period_event_boundary
FOR
temporal_period;
UNIQUE
si:
technical_reference
.identifier;
END_ENTITY
; (* temporal_period *)
Generated on Tue Jul 10 19:39:12 2001
© Copyright 2001 POSC. All rights reserved.