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Re: Non-deterministic content models

• To: "Eric van der Vlist" <vdv@d...>,<xml-dev@l...>
• Subject: Re: Non-deterministic content models
• From: "Bob Foster" <bob@o...>
• Date: Tue, 15 Jul 2003 18:51:42 -0500
• References: <3.0.6.32.20030715055242.01069350@p...> <20030715040539.GD17627@m...> <1058247974.26014.54.camel@delleric> <044201c34ab4$cf13b5d0$1401a8c0@snobird> <1058261928.26015.156.camel@delleric>

From: "Eric van der Vlist" <vdv@d...>
> > I am not sure this technical distinction helps the average schema
writer.
> > For example, rewriting an ambiguous schema so it is merely
non-deterministic
> > won't help XML Schema users. ;-}
>
> This chapter is in a book about Relax NG and its number one goal is to
> help Relax NG users :-) ...

Good point. Then you could probably omit that section on rewriting patterns
so they are deterministic (or is it unambiguous?). RELAX NG users seldom
need to do that. ;-}

> > The only case I can think of where the distinction makes any difference
is
> > in XML Schema union types, which are allowed to be non-deterministic but
are
> > not unambiguous because of the first-match rule.
>
> Or for using Relax NG tools (such as MSV) which can derive type
> information out of unambiguous schemas whether deterministic or not
> (more precisely, it will provide type information even if the schema is
> ambiguous but I wouldn't always advise to rely on it).

That's interesting. I assume you're talking about MSV when used as a SAX2
filter. What does MSV do when it has multiple valid types, pick one?

Bob Foster

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    • From: Gustaf Liljegren <gustaf.liljegren@b...>
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