World Data
World data is not currently implemented; check back very soon!
World data is used to specify any persistence to a GameServerProxy so that when it gets started again via another GameServerCollection it will load that data. This is useful for any data that's associated with the world that isn't related to some persistent actor.
For example, world data could be long-term scoring between different guilds or the current time of day (though the latter could be implemented using a persistent item too). However, if you want to have a player-created building to persist, that should be defined using a persistent item. Ultimately, the difference comes down to: if you want the data to initiate the spawning of an actor, use a persistent item, otherwise use world data in the proxy.