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With a DTD, there are very few ways to constrain the textual content of an
element (you can constrain it to be EMPTY, but not to be non-empty).
In XML Schema, you can declare the element to be of type my:non-empty-string
where my:non-empty-string is a simple type derived from xs:string using the
facet <minLength value="1"/>
Michael Kay
http://www.saxonica.com/
> -----Original Message-----
> From: Sudheshna Iyer [mailto:sudheshnaiyer@hotmail.com]
> Sent: 03 April 2006 15:59
> To: xml-dev@lists.xml.org
> Subject: [xml-dev] Validation of missing elements in xml:
>
> Team,
>
> I have the simple following xml and dtd:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE Person SYSTEM "Person.dtd">
> <Person>
> <name>aaa</name>
> <email>aaa.bbb@xxx.com</email>
> </Person>
>
> DTD:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <!ELEMENT Person (name, email)>
> <!ELEMENT email (#PCDATA)>
> <!ELEMENT name (#PCDATA)>
>
> As per the DTD, please note that "name"and "email" elements
> are required
> and if I validate the above with xmlspy
> xml is valid and wellformed.
>
> But I want to catch the empty element scenario. for eg, if I
> remove the
> value of the "name" element from person.xml:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE Person SYSTEM "Person.dtd">
> <Person>
> <name></name> -----> see this.
> <email>aaa.bbb@xxx.com</email>
> </Person>
>
> and validate the xml through xmlspy, xml is still valid and
> wellformed.
>
> How do I catch these empty element problems through DTD? or
> is it possible
> through xsd? What is that I need to include
> in dtd or xsd to validate empty elements in dtd or xsd?
>
> Thanks for your help.
>
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