Derivation by Restriction

[Henry S. Thompson]

Stefan Haustein <stefan.haustein at trantor.de> writes:

> This principle would be violated if you "restrict" B 
> that a subelement required in A is not required in B. 
> In fact, that would not be a specialization or 
> restriction but a generalization. If I read the specs 
> right, you are not allowed to widen the [minOccurs...
> maxOccurs] interval, so the problem you address seems 
> not exist.

This analysis is correct.

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 at cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/

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