List of Import References :
See BOOL
See DENOTATION
SIGNATURE Union3[data1: SORT, data2: SORT, data3: SORT]
$Date: 1998/06/16 16:00:06 $ ($Revision: 1.1.1.1 $)
-- disjoint union of three types
-- Parameter
SORT data1 data2 data3
TYPE union == data1(cont1: data1)
data2(cont2: data2)
data3(cont3: data3)
next node: Union4,
prev node: Union2,
up to node: Subsystem UnionLike