declare string:    "double precision"//""//""//""
declare component: double precision
declare result:    double precision
declare dummy:     double precision

a == b:            a == b
a NE b:            a /= b
a <= b:            a <= b
a >= b:            a >= b
a <  b:            a < b
a >  b:            a > b

FREE(x):           
COPY(dst,src):     dst=src
MOVE(dst,src):     dst=src
