The trigger occurs in response to a specific named event, and no other
information about the trigger is specified. Named events are completely
pre-coordinated, and the formal semantics of the trigger are not provided.
The trigger occurs at a specific time or periodically as described by a
timing or schedule. A periodic event cannot have any data elements, but may
have a name assigned as a shorthand for the event.
Returns the enum constant of this type with the specified name.
The string must match exactly an identifier used to declare an
enum constant in this type. (Extraneous whitespace characters are
not permitted.)
Parameters:
name - the name of the enum constant to be returned.