Cart
|
[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Subtyping in XML
Jeff Lowery <jlowery@s...> writes:
> I thought someone else would note that the DTD
>
> <!ELEMENT MY-NON-BOOLEAN ((TRUE | FALSE)?, (TRUE | FALSE))>
>
> 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].
ht
[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@c...
URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
|
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! 
Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|
|||||||||
