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   RE: [xml-dev] Subtyping in XML

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Cantor The Mad.  Back to the denumerability thing 
and quantum foaming at the mouth...

Ok.  Still, he said 

"types first and formost define a concept of membership.
Such definitions must be formal and unambiguous."

So are you saying "unambiguous" means countable?


-----Original Message-----
From: John Cowan [mailto:jcowan@reutershealth.com]

"Bullard, Claude L (Len)" scripsit:

> Doesn't that make type synonymous with set?

No.  Types have to be specifiable: there are only countably many types,
but there are uncountably many sets, indeed $2^\aleph_0$ of them.
An easy way to achieve this is to require that types have names.


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