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Message: [QUOTE="Patrick TJ McPhee, post: 771262"] % I have a requirement to have an XML document % that consists of an arbitrarily large expression. You might want to sketch out what you want your XML to look like before you write the DTD. % expr => term rest % term => ID relop ID % rest => (conjunction term) | e You probably want to use Kleene closure for this kind of production what you've written will require <expr><term><id>i</id><relop type='EQ'/><id>7</id></term><rest/></expr> to represent i = 7 To represent i = 7 and j < 4 you'd need <expr><term><id>i</id><relop type='EQ'/><id>7</id></term> <rest><conjunction conjunction type='AND'/> <term><id>i</id><relop type='EQ'/><id>7</id></term></rest> </expr> While what you probably want is this, without a `rest' element. <expr><term><id>i</id><relop type='EQ'/><id>7</id></term> <conjunction conjunction type='AND'/> <term><id>i</id><relop type='EQ'/><id>7</id></term> </expr> You can get that by changing the definition of expr <!ELEMENT expr (term,(conjunction,term)*> and removing the definition of rest. [/QUOTE]