Item Types

Four types: loc, obj, pc and npc

Type loc
Locations
Connected to another locations

Type obj
Game object
Can be get/drop by default.
Aditional attributes change its behavior (by example, containers)

Type pc (playing character)
The protagonist, usually just one (only one active pc, by the moment)
When a pc is not active, it works as a npc
Each pc has its own state and memory

Type npc (non-playing character)
Can react to the pc actions.
One npc could have different reactions to different pc-s.
Can do actions by its own iniciative.