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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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The default behaviour is indeed to split by white space. Some people just explicitly write out the default parameter for clarity, even though it's not required.
One of the best things about this site is that you can very easily learn this for yourself by forking the solution (no need to save / publish, you can just study) and experimenting with the code.