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Honestly, I'm not playing stump the experts, but what about the instance? ((A, B, D?) | (A?, B, C?, D?, E)) In this instance 'C' can only be present if 'E' is present. -Jim -----Original Message----- (Excerpt) <!ELEMENT Request ((A, B, C?) | (A?, B, C?, D))> becomes <!ELEMENT Request ((A, B, C?, D?) | (B, C?, D))>
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