Re: Element content

[Wayne Steele <xmlmaster@hotmail.com>]

A DTD cannot express this constraint.
Anywhere CDATA can occur, an empty string is equally welcome.

If you have a lot of constraints that you cannot express using DTDs, you 
might want to look at Schematron:
   http://www.ascc.net/xml/resource/schematron/schematron.html


-Wayne Steele



>From: Mick McRae <Mick.McRae@abci.gov.au>
>To: xml-dev@lists.xml.org
>Subject: Element content
>Date: Wed, 14 Mar 2001 12:33:52 +1100
>
>Non-empty elements.
>
>I have a basic XML document which references a DTD.  The document may have 
>some tags as follows;
>
><?xml version="1.0" encoding="UTF-8"?>
><!DOCTYPE StaffReport SYSTEM "file:/opt/app/java/staff.dtd">
><StaffReport>
>   <Person>
>     <Firstname>Mick</Firstname>
>     <MiddleName></MiddleName>
>     <Surname></Surname>
>   <Person>
></StaffReport>
>
>
>Is it possible within the DTD to specify that certain elements cannot be 
>empty?  For example, in the sample XML above, I would like 
><MiddleName></MiddleName> to be valid, as a middle name is not required, 
>but <Surname></Surname> not valid, as a surname is required.  Can I do this 
>or do I need to explicity test for the tag name and length when pasring the 
>document using SAX?
>
>Any help appreciated?
>
>Regards,
>Mick
>
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