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Re: EquivClass & Derived Type

• From: ht@c... (Henry S. Thompson)
• To: xml-dev@x...
• Date: 17 Feb 2000 08:52:12 +0000

Michael Anderson <michael@r...> writes:

> Hi,
> Thanks for all the replies to my previous questions on equivClass.  I
> now have a new problem based on my new understanding.  At the moment
> there exists equivClass and derived type, but I do not see why both are
> necessary as derived type could do the same job.

> [examples elided]

> By separating equivalence from inheritance, are we saying that even
> elements of the same type or subtypes of the same type are not
> necessarily substitutable by one another in every context.  For
> instance, even if elements "name" and "account number" are both of type
> string, they could not be used in place of one another in most context.
> Is this the main reason behind the separation of inheritance and
> equivalence?

Precisely.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@c...
		     URL: http://www.ltg.ed.ac.uk/~ht/

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