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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.
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"XIIX" isn't a valid Roman numeral either way.
Mathematically, it the same, but sometimes, we lose sense with over-refactoring.
Why is the Roman numeral not valid?
XIIX: A numeral of lower value, I ( = 1), may not stand in front of a group of numerals in subtractive notation, IX ( = 9).