The description of the DTD in the XML 1.1 specification is very brief, and it is difficult to get an estimate of what features are available. For example, if you look at the unflattened XHTML + MathML + SVG DTD , I know that you can import and partially redefine external DTDs, but I would never have guessed that this was possible when reading the specification.
Does anyone know of a good resource for learning the intricacies of writing DTDs?
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