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1) Using nillable elements allows you to maintain full structure of the markup in the instance document, even when meaningful content is missing. It also, perhaps, gives the receiver a little extra insurance that nothing got 'lost' in the generation/translation of a document. Not an ironclad guarantee, though... 2) Nil (or null) can be taken to mean 'undefined', rather than 'does not exist'; although it's doubtful many applications will care about such fine distinctions.
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