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RE: DTD and Illegal Construct
- From: "Dudley, Mark" <Mark.Dudley@usa.xerox.com>
- To: email@example.com
- Date: Wed, 10 Jan 2001 16:35:14 -0500
It is an ambiguous content model. You may want to try:
<!ELEMENT Request (A?, B, C?, D?)>
But that might not be what you want.
From: Dan Vint [mailto:firstname.lastname@example.org]
Sent: Wednesday, January 10, 2001 4:14 PM
Subject: Re: DTD and Illegal Construct
This is an ambiguous content model. The parser (by design in SGML/XML) isn't
supposed to try and figure out which of the two models are being built
if you have element A or B or C in this case, all three will cause the same
> I wanted to run this past some knowledgeable people. Is the following a
> 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
> to determine whether or not D is required."
> Jim Shain
> Sr. C/S Architect
> ALLTEL Information Services