[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: [schemas] non-deterministic content model avoidance
Philippe Poulard wrote: > hi, > > i try to design a schema language, and i encoutered the famous well-known problem : > [snip] > to express the constraints, we could write : > (odd, even)*, odd? > but it is invalid in DTD because of the violation of the "non-deterministic content model" rule > > as you know, this problem is unresolvable because it is an unambiguous pattern which is not deterministic and can't be rewritten in a deterministic form (i picked it from the Eric's relax book) > > my schema language can express such a content model (4 lines) without looking forward, but i'd like to know if : > -it is possible with W3C XML Schemas ? No. > -it is possible with Relax NG ? Yes. In fact, in the compact syntax, with suitable definitions of odd and even, it can be written exactly as you have it: (odd,even)*, odd?. > additionally, i'd like to know whether Schematron can be used for editing purposes or not (i don't think so), that is to say if one can predict if an element is available with a given context, for example. Don't understand your question. If you're asking whether the above constraint could be enforced with Schematron, the answer is yes. Bob Foster http://xmlbuddy.com/ (Reply not cross-posted.) > thanks for your help
|
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
|