It looks like *.xsl files are regular XML files, but the example you gave is more like JSON. You should be able to parse them with the XML api or the JSON api.

I don't know much about the url requests part. That's a thing I should look for myself too.

Hello everyone,

I wonder if there's a way to handle different screen densities. I'm making a game on Mac and it seems there's no support.
Is there a flag to set in the project?
I only tried with Neko.

You should only check for null when it's supposed to happen, for example in a function that takes an optional parameter.
When in your code you're dealing with null when it shouldn't be there, you should let it crash so you see exactly where the problem occurs, else you will delay and hide the issue and make it harder to track the origin of your bug.
If you're facing initialization order problems, try to initialize later or add methods that finalises init so you're sure everything's in memory, a good place would be in the manager that creates both of your objects.