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   DTD questions

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I'm creating modular DTDs and in this mind would like to be able to use 
Parameter Entities.

What I want to do is simple :

<!ENTITY % test "(oneElem|theOther)">
<!ELEMENT root %test;>

I try with xerces, microsoft and xmlspy  parser that all refuse this.

Of course, in ths example, I'm able to have a workaround :

<!ENTITY % test "oneElem|theOther">
<!ELEMENT root (%test;)>

But my real application is something like :
	<!ENTITY % test "(oneElem|theOther)">
<!ENTITY % test "EMPTY">
<!ELEMENT root %test;>

That's the reason why I need to have the parenthesis within the entity.

Any idea on this problem ? Any idea on how to solve it ?




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