Perception - Learning Game AI Programming with Lua - page 497

Agent sighting events
Now that we can detect when another agent is visible, we can create specific messages
about an agent sighting, a dead enemy, or even a dead friend that can be sent to teammates.
By extending our EventType table, we can create the three new event types for which
we'll be sending out events:
AgentCommunications.lua
AgentCommunications.EventType.DeadEnemySighted =
"DeadEnemySighted";
AgentCommunications.EventType.DeadFriendlySighted =
"DeadFriendlySighted";
AgentCommunications.EventType.EnemySighted = "EnemySighted";