Mixed Content Models

Jerome McDonough jmcdonou at library.berkeley.edu
Mon Sep 21 20:49:56 BST 1998

Hello all,

	In looking over the XML spec (3.2.2) on mixed content
models, something isn't clear to me.  I'm hoping someone
here can enlighten me.

	I've inherited a DTD for development that was originally
intended to be an SGML DTD, and has been converted to XML.
Contained within it is the following:

	<!ELEMENT qstn   (#PCDATA | (preQTxt?, qstnLit?, postQTxt?, forward?,
							  backward?, ivuInstr*))*

Is this a legitimate content model under XML section 3.2.2?
Msxml doesn't have a problem with it, and nsgmls using the -wxml flag
also happily parses the DTD.  IBM's xml4j, however, complains:
"Codebook.dtd: 1256, 33: This content model is not matched with the
mixed model '(#PCDATA|FOO|BAR|. . .|BAZ)*': '(#PCDATA|(preQTxt?, qstnLit?,

I suppose this boils down to, should the parser ignore what's within
a content group when evaluating whether someone is trying to constrain
the order or number of occurrences of 'child elements.'  If the
only 'child elements' to be considered in the above case are:

	A.	#PCDATA, and
	B.   (preQTxt?, qstnLit?, postQTxt?, forward?, backward?, ivuInstr*)

Jerome McDonough -- jmcdonou at library.Berkeley.EDU  |  (......)
Library Systems Office, 386 Doe, U.C. Berkeley     |  \ *  * /
Berkeley, CA 94720-6000    (510) 643-2058          |  \  <>  /
"Well, it looks easy enough...."                   |   \ -- /  SGNORMPF!!!
         -- From the Famous Last Words file        |    ||||

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev at ic.ac.uk
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/
To (un)subscribe, mailto:majordomo at ic.ac.uk the following message;
(un)subscribe xml-dev
To subscribe to the digests, mailto:majordomo at ic.ac.uk the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa at ic.ac.uk)

More information about the Xml-dev mailing list