Loops in DTD?

[Crystian]

Hi,

I make an vadidating XML processor. Until now, the processor can make a complex tree from data from Document Type Definition and validat the declaration from it. I am not sure if this tree can contain loops.

I mean something like this:

<!DOCTYPE root [
	...
   <!ELEMENT element1 (element2*)>
	...
   <!ELEMENT element2 (element1?)>
	...
]>


Thank you,

Cristian Matei

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