POSC Specifications: Epicentre Version 3.0
Logical Data Model
ENTITY
ELLIPSOID
(* Open *)
SUBTYPE OF
(
aliasable_technical_reference
);
inverse_flattening :
OPTIONAL
ndt_real4
;
semimajor_axis :
ndt_accurate_length
;
semiminor_axis :
OPTIONAL
ndt_accurate_length
;
INVERSE
geodetic_datum :
SET [0:?] OF
geodetic_datum
FOR
ellipsoid;
UNIQUE
si:
technical_reference
.identifier;
WHERE
val: EXISTS(semiminor_axis) XOR EXISTS(inverse_flattening);
END_ENTITY
; (* ellipsoid *)
Generated on Tue Jul 10 19:37:47 2001
© Copyright 2001 POSC. All rights reserved.