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The crux of the problem is the wrapping of the html elements in the new DTD. Instead of wrapping existing elements you need to add a subset of XHTML's tagset into your own DTD. The subset should be aimed at simple presentation elements that you know you can map to, or directly use, in other formats e.g. p, b, perhaps ul etc. Note that table markup is particularly troublesome as it is often used in HTML to achieve layout effects that are difficult/impossible to re-use in other formats.
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