Commented by: @mrotteveel

That is incorrect. That procedure is part of the RDB$TIME_ZONE_UTIL package, so its name is actually RDB$TIME_ZONE_UTIL.TRANSITIONS when called. See also https://github.com/FirebirdSQL/firebird/blob/master/doc/sql.extensions/README.time_zone.md#procedure-transitions

Commented by: Segey Khalyutin (notesoft)

now

create procedure TRANSITIONS
returns( result integer )
as
begin
result = 1;
suspend;
end

select * from TRANSITIONS

is susseful.

Package is good idea, but current code not used it.
Our database upgrade code comparator is stup on this. We are fix it by use rdb$system_flag.

Are You sure, that wil be no conflict with user procedures in future and all system Package items wil be not "reserved" words ?...

Commented by: @mrotteveel

Package are a concept since Firebird 3, and RDB$TIME_ZONE_UTIL is a package, and TRANSITIONS is a procedure in that package. If you want to properly discern normal procedures from procedures in packages (whether they are system packages or normal packages) you'll need to take the RDB$PACKAGE_NAME into account together with RDB$PROCEDURE_NAME.

There is no guarantee whatsoever that certain words do not become reserved words in the future, but in this case it is unlikely (at least, not for this purpose).

Commented by: Segey Khalyutin (notesoft)

Thanks, OK