[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Non-deterministic content model
Hi Francis, > Robin Cover wrote: >> On Thu, 14 Jun 2001, Marcus Carr wrote: >> > >> > Sam Willmott from OmniMark released a white paper on content model algebra >> > in the early nineties. He concluded that there was only one content model >> > that cannot be disambiguated and I have yet to see proof to the contrary. >> > The model is: >> > >> > (x, (y, x)*, y?) > > I'm trying to iterpret this interesting theory thread in the light of > existing validation technologies. > > Taking the chess moves interpretation, the ambigous model above can be > implemented in Schematron as: > [snip] > > Is it equally simple to implement this ambiguous model in other schema > technologies? RELAX NG doesn't require deterministic patterns; the following schema should do it: <element name="game"> <element name="white" /> <zeroOrMore> <element name="black" /> <element name="white" /> </zeroOrMore> <optional> <element name="black" /> </optional> </element> XML Schema forces deterministic model groups, so you can't use that. Cheers, Jeni --- Jeni Tennison http://www.jenitennison.com/
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