Re: [xml-dev] Bounds Specification

["K. Ari Krupnikov" <ari@cogsci.ed.ac.uk>]

Sameet Nasnodkar wrote:
> 
> Okay .... I admit I am not that good at subjects. But I guess you guys
> could tell me if there is a way to do this. You know how we can specify
> the number of elements using a * or a + as
> <!ELEMENT elem (E1*, E2, E3+)>
> 
> In the above line, we say that E1 ocuurs 0 or more times, E2 occurs
> once and E3 occurs at least once.
> 
> I have a situation wherein I need to specify an element E4 that would
> be guaranteed to occur 0 or 1 times.

<!ELEMENT elem (E1*, E2, E3+, E4?)>

Ari.