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Re: Non-deterministic content models

• To: "John Cowan" <cowan@m...>,"Eric van der Vlist" <vdv@d...>
• Subject: Re: Non-deterministic content models
• From: "Bob Foster" <bob@o...>
• Date: Wed, 16 Jul 2003 01:43:52 -0500
• Cc: <xml-dev@l...>
• 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> <04ae01c34b2c$0c0738f0$1401a8c0@snobird> <20030716012245.GA10518@m...>

From: "John Cowan" <cowan@m...>
> Bob Foster scripsit:
> > 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. ;-}
>
> Actually, they do if they need to produce WXS as an output of the process,
> which is not rare.

True, tho I suspect that the basic algorithm many use is "run it through
trang." ;-}

> > 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?
>
> MSV is a pure validator, so it doesn't care why a document is valid,
> just so it's valid.

Yes, but looking at the code I noticed MSV creates a list of types collected
in the course of validating an attribute. I thought perhaps it had the
ability to pass this information on to an application. Eric kind of led me
there with his comment

>>> ...MSV...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).

But maybe not. Eric, is this what you meant?

Bob

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