The PROCEDURE REFERENCE declaration declares a procedure reference, which is a structure that allows a procedure to be invoked by referencing the procedure reference.

<procedure reference declaration>

──┬──────────────────┬─ PROCEDURE REFERENCE ──<identifier>─────────────►
  └─<procedure type>─┘
►─┬─────────────────────────┬─ ; ── NULL ──────────────────────────────┤
  └─<formal parameter part>─┘