POSC Specifications: Epicentre Version 3.0
Logical Data Model
ENTITY
DISCOVERY_AREA
(* Local *)
SUBTYPE OF
(
pfnu
,
technical_earth_feature
);
application_date :
OPTIONAL
ndt_date
;
declaration_date :
OPTIONAL
ndt_date
;
effective_date :
OPTIONAL
ndt_date
;
expiry_date :
OPTIONAL
ndt_date
;
UNIQUE
si:
earth_feature
.identifier,
earth_feature
.unique_within;
END_ENTITY
; (* discovery_area *)
Generated on Tue Jul 10 19:37:42 2001
© Copyright 2001 POSC. All rights reserved.