Reading Material : UO's Resource System

If you're truly interested in the demo internals and if you want to understand the data and the script/object system the uodemo is using, then I recommend that you read the following 3 postings on Raph Koster's Website:
Raph Koster also gives us some insight in the skill system used in Ultima Online here:
Raph Koster also gives us some insight in the skill system used in Ultima Online here: