[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: DTD and Illegal Construct
Jim Shain wrote: > I wanted to run this past some knowledgeable people. Is the following a legal > or illegal construct for an element in a DTD? > > <!ELEMENT Request ((A, B, C?) | (A?, B, C?, D))> > > Some have stated that it is illegal because "When A is present it isn't possible > to determine whether or not D is required." That's corrrect - the content model is illegal because it is non-deterministic. The intent is preserved in a legal model by changing it to: <!ELEMENT Request ((A, B, C?, D?) | (B, C?, D))> -- Regards, Marcus Carr email: mrc@a... ___________________________________________________________________ Allette Systems (Australia) www: http://www.allette.com.au ___________________________________________________________________ "Everything should be made as simple as possible, but not simpler." - Einstein
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