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I'm not sure what you mean by "optional". I assume you mean that in the DTD this would be declared as #IMPLIED? If so, I would suggest that this be required for verbatim elements, with a default value of "preserve".
I think that we didn't defined default value because the best practise in these times is to consider schema as a tool solely used for validation not as a tool that can modify infoset of the document. This approach is marketed by Relax NG for example. And because the next generation of DocBook will be primary defined in RNG that can't convey default attribute values it would cause compatibility problems if we would use attribute defaulting just for some releases of DocBook schema.
This would assist any generic processing tools that don't have specific knowledge of DocBook, especially formatting tools.
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