XML and repeatable model groups

[David Megginson]

geirog at falch.no writes:

 > >From the dtd: <!ELEMENT line     (#PCDATA | stagedir)+>
 > 
 > D:\WINUTILS\JADE\NSGMLSU.EXE:shakspe2.dtd:22:39:W: #PCDATA in model group
 > that is not repeatable
 > 
 > Why is this flagged as an error/warning? Isn't this a repeatable model group?
 > Or isn't (#PCDATA | stagedir)+ a legal model group in XML?

The message should have read "#PCDATA in model group that is not
optional and repeatable".  The draft XML spec allows mixed content
only as an optional and repeatable OR group, where #PCDATA is the
first member.

By the way, you gain nothing by using "+" instead of "*", since
#PCDATA can be an empty string.  For example, in full SGML, the
following would satisfy (#PCDATA | stagedir)+ as well as it satisfies
(#PCDATA | stagedir)*:

  <line></line>


All the best,


David

-- 
David Megginson                 ak117 at freenet.carleton.ca
Microstar Software Ltd.         dmeggins at microstar.com
University of Ottawa            dmeggins at uottawa.ca
        http://www.uottawa.ca/~dmeggins

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