<!ELEMENT X ((a,b),((c,d)|(e,f)))> That is, each group must be grouped in parentheses. Don't forget XML is case-sensitive - so don't use <a> if your DTD says A. Cheers, Tom P [Macdonald Jeremy]

I am trying to model the following:

<!ELEMENT X (A , B), (C, D | E, F)

which I can't do as the above as I can only use one kind of connector.

I am trying to get the instance to be either: <x><a> <b> <c> <d></x>

or

<x><a> <b> <e> <f></x>

Any / all ideas would be welcome.