How to define DTD without strict element order?

You use or (a vertical pipe) and repeat (an asterisk:).

You use or (a vertical pipe) and repeat (an asterisk:) This means eltype1 can contain any number of repetitions of eltype2 or eltype3.

I just tested your solution and it's more concise than that found here stackoverflow. Com/questions/4744507/… (via Bavarious). The only drawback is that it does not enforce the existence of the pair but rather either one in any order :( – giulio Apr 13 at 2:36.

The only issue with the currently accepted answer is that it doesn't force only one of each element in any order. For example, you could have 2 eltype2 elements and no eltype3 elements. If you need to be sure that both elements are present and that each occurs only one time, this is a more precise element declaration: Example in an internal subset: element three element two.

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