Looking around for a top level ontology to use with Halo I finally made my way to the Cyc site. I'd come across Cyc in XTM write-ups, and it looks like they are working on similar ideas (although with far more money I'm sure!) Anyway their interactive top level ontology is a great resource. It must be somthing like this that the 20 Question machine has - I must buy one to find out.
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