Is this legal in a DTD?

[Ronald Bourret]

Serrat Jaime wrote:

> I was wondering if the following would be possible in a DTD.  Consider:
> 
> <!ELEMENT PARENTS   (FATHER?, MOTHER?)>
> <!ELEMENT FATHER   (CHILD*)>
> <!ELEMENT MOTHER   (CHILD*)>
> <!ELEMENT CHILD (SON | DAUGHTER)>      <========= Alternative!
> <!ELEMENT SON (#PCDATA)>
> <!ELEMENT DAUGHTER (#PCDATA)>
> 
> I've seen OR in the context of element attributes, of course, but what about
> in element definitions?

Yes, it is legal.

-- Ron Bourret


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