[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: EquivClass & Derived Type
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/ *************************************************************************** This is xml-dev, the mailing list for XML developers. To unsubscribe, mailto:majordomo@x...&BODY=unsubscribe%20xml-dev List archives are available at http://xml.org/archives/xml-dev/threads.html ***************************************************************************
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