A DOUBLE declaration declares simple variables that can have double-precision values (that is, 96-bit arithmetic entities).
<double declaration>
┌◄───── , ─────┐ ──┬───────────┬─┬───────┬─ DOUBLE ─┴─<identifier>─┴────────────────────┤ ├─ PRIVATE ─┤ └─ OWN ─┘ └─ PUBLIC ──┘
<double identifier>
An identifier that is associated with the DOUBLE data type in a DOUBLE declaration.

