Description.  This type describes the event operation's state.

Enumeration values.  Possible values are shown, along with descriptions, in the following table:

EO_CREATEDThe event operation has been created, but execute() has not yet been called.
EO_EXECUTINGThe execute() method has been invoked for this event operation.
EO_DROPPEDThe event operation is waiting to be deleted, and is no longer usable.
EO_ERRORAn error has occurred, and the event operation is unusable.

A State value is returned by the getState() method.