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Re: Define a root in a DTD

• From: David.L.Eiland@f...
• To: Peter Flynn <peter@s...>
• Date: Tue, 26 Jun 2001 13:34:43 -0500

Hi Peter,

I think you should not genalize it so.. This generalization might be true
often, but need not always be. It is neither a "necessary" condition nor a
"sufficient" condition for the root element to follow.

> You don't need to. The root element is always the one that
> does not appear in the content model of any other element
> type. All other elements must get mentioned somewhere else,
> but the root element never does. eg
>
> <!ELEMENT name (#PCDATA)>
> <!ELEMENT phone (#PCDATA)>
> <!ELEMENT email (#PCDATA)>
> <!ELEMENT person (name,phone,email)>
> <!ELEMENT directory (person+)>
>
> "directory" will be deduced as the root element because it
> does not appear in the content model of any other element
> type.

regards - murali.


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