List of EPL keywords

The table below lists the reserved words called keywords. EPL keywords are case sensitive. You cannot use keywords as identifiers in EPL programs unless you prefix them with a hash symbol (#). Some keywords are flagged with an asterisk (*). You can safely use these keywords outside the scope of a stream query. Inside a stream query, you cannot use these keywords as identifiers unless you prefix them with a hash symbol (#). See Escaping keywords to use them as identifiers.

EPL keywords
action	aggregate	all	and
as	at	boolean	bounded
break	by *	call	catch
chunk	completed	constant	context
continue	currentTime	decimal	dictionary
die	else	emit	enqueue
event	every *	false	float
for	from	group *	having *
if	import	in	integer
join *	largest *	location	log
monitor	new	not	on
optional	or	package	partition *
persistent	print	retain *	return
returns	route	rstream *	select *
sequence	smallest *	spawn	static
stream	streamsource	string	then
throw	to	true	try
unbounded	unique *	unmatched	using
wait	where *	while	wildcard
with *	within	xor

Some reserved keywords are actually operators. Nevertheless, the restriction still applies. Some Apama tools, such as the Event Modeler, generate code based on EPL and in such code there might be symbols that resemble identifiers but contain hash (#) characters, which are not allowed in identifiers. These "identifiers" are placeholders that are later replaced with valid identifiers that do not contain the hash character.

The string join() method is still supported. That is, you can still use the following and you do not receive a warning: string.join(). Also, note that the join keyword has a query scope and join is also a reserved word for use outside queries in a future release.

Note that ondie, onload, and onunload are not reserved keywords. They are the names of special actions. While you can use "ondie", "onload", and "onunload" as identifiers, doing so is not recommended.