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   Re: [xml-dev] Subtyping in XML

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Jeff Lowery <jlowery@scenicsoft.com> writes:

> I thought someone else would note that the DTD
> is nondeterministic and therefore not allowed by XML Schema.  Or does it
> matter? 
> I guess if the point is that XML doesn't map ideally to objects, then a
> particular choice of schema language is moot.  But binding XML to object
> data (and back) seems in general easier than, say, porting object data to
> relational models (and plenty of people are still doing that). 
> What is the argument? That XML should be XML, objects should be objects, and
> database tables should remain tables?  But they won't stay in their little
> respective corners!   If the argument is instead that all data model
> mappings should be carefully crafted on a case-by-case basis, then
> personally I'm very dissatisfied with that prescription.  The natural order
> of things is that complexity breeds simplicity by necessity.  Did I miss an
> alternative solution somewhere?

Sure, XML Normal Forms [1], [2].


[1] http://www.ltg.ed.ac.uk/~ht/normalForms.html
[2] http://www.ltg.ed.ac.uk/~ht/mapping.html
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2002, 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@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
 [mail really from me _always_ has this .sig -- mail without it is forged spam]


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