Enumerated Constants in the Operational Interface

When using enumerated constants such as BROWSE, LOCKED, REMOVE, the PL/SQL constants need to be specified with the scope of the packages defining it. All types associated with the operational interfaces have to be prepended with dbms_aq. For example:

DBMS_AQ.BROWSE

Table 2-4 Enumerated types in the operational interface

Parameter	Options
visibility	IMMEDIATE, ON_COMMIT
dequeue mode	BROWSE, LOCKED, REMOVE, REMOVE_NODATA
navigation	FIRST_MESSAGE, NEXT_MESSAGE, NEXT_TRANSACTION
state	WAITING, READY, PROCESSED, EXPIRED
sequence_deviation	BEFORE, TOP
wait	FOREVER, NO_WAIT
delay	NO_DELAY
expiration	NEVER