How do I load multiple worlds?

Hi, I'm very new to PocketMine and I'm trying to figure out what the core code provides vs plugins. How do I configure my server to have multiple worlds?
I added some worlds to the pocketmine.yml file:

Code:

worlds:
 lobby: []
 adventure: []
 creative: []

I looked through server.log and I didn't see any indication that the worlds exist, but I do see the entries in the worlds/ directory. How do I switch between them? /transferserver doesn't seem like the appropriate command.

I can only assume that the array is used to hold the individual settings for each world. Is that correct? Could I:

Code:

lobby: ['seed: 404', 'generator: FLAT']

I think we need to have a GUIDE forum setup. I don't think the notes in these config files are super useful. The example note for worlds didn't indicate that I could simply add a 'world-name' followed by a colon and an empty array. I found that in another forum thread.

I feel that I need to append my inquires with a big THANK YOU to the developers that make this server possible. I am truly grateful for the level of effort it takes to maintain this. I'm merely frustrated because there's little guidance to people new to this.

 

You can load the work by using a code.

 

What would that code be, LewBr?

 

PHP:

\pocketmine\Server::getInstance()->loadLevel('name');

 

OK so based on your responses I can conclude that loading worlds through a command isn't supported in the core code. This is something that's achieved through plugins. Thanks.