XML doubts - sets and arrays

[Ron Bourret]

Rajesh N wrote:

> * How will I represent something like
> 	MyNonTermElt can take (X, Y , X) values.
> ie, there will be exactly 3 values (2 of type X and one of type Y)
> and their order is not important.

Unless I'm missing something, you can't.

> Another question is regarding arrays..
> * can I represent an Element as an array of values ?

Do you mean that an element foo is an array of subelements?  If so, any of the 
following works, depending on whether you want to specify the number of elements 
or not.  Notice that there is no shorthand for "I want foo to contain 500 
instances of bar."

<!-- foo is an array of zero or more bar's -->
<!ELEMENT foo (bar*)>

<!-- foo is an array of one or more bar's -->
<!ELEMENT foo (bar+)>

<!-- foo is an array of exactly three bar's -->
<!ELEMENT foo (bar, bar, bar)>

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