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Re: Define a root in a DTD
- From: Murali Mani <mani@CS.UCLA.EDU>
- To: Peter Flynn <peter@silmaril.ie>
- Date: Tue, 26 Jun 2001 10:10:17 -0700 (PDT)
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.