• To: "Murali Mani" <mani@C...>,<xml-dev@l...>
• Subject: Re: Two quick questions regarding restriction in XML Schema
• From: "Jeff Greif" <jgreif@a...>
• Date: Wed, 22 May 2002 17:41:08 -0700
• References: <Pine.SOL.4.33.0205221257490.9486-100000@p...>

There is some danger in using 'accidental' subtype relationships that arise
from similar but unrelated hedge types.

We could have:
   president isa manager isa employee isa person
  vice-president isa manager isa employee isa person

and hedge types:
company-bowling-team -> (employee+)
5-year-plan-strategists -> (president, vice-president*)

Yes, the president and vice-presidents could form a bowling team,
but it's unlikely that the author of these types had that in mind.

Jeff

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