New schema spec
paul at prescod.net
Tue May 11 20:48:05 BST 1999
roddey at us.ibm.com wrote:
> Well, its kind of a practical matter. From a support perspective (kind o'
> important to a company our size) proving that the content model is ambiguous
> means never have to say you're sorry, or at least have to say you're sorry less
My question is: under what circumstances does an ambiguous content model
cause a problem?
<!ELEMENT ABC (DEF?,DEF)>
Okay, so this is ambiguous according to the XML/SGML definition of
ambiguous. What's the problem? It matches the same thing as DEF, DEF?
<!ELEMENT ABC (DEF|DEF)>
This is ambiguous according to the more widely accepted definition. I
still don't see a problem. It matches the same thing as DEF.
I think that your concern about ambiguity comes from a background in
context free grammars where it is a big problem. In XML, every element is
explicitly separated from every other one with tags so ambiguity is not a
Paul Prescod - ISOGEN Consulting Engineer speaking for only himself
Diplomatic term: "Emerging Markets"
Translation: Poor countries. The great euphemism of the Asian financial
meltdown. Investors got much more excited when they thought
they could invest in up-and-comers than when they heard they could invest
in the Third World.(Brills Content, Apr. 1999)
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