XML DTDs are in the business of constraining people to the data models and
data that the software is expecting/can deal with. I don't see any big
difference between saying: "This content must be restricted to this set of
characters" and "this content must be a NMTOKEN or base-64 encoded."
Nevertheless, this is clearly a schema problem and CDATA sections seem to
me to be a really bad tool for enforcing this distinction. No editor
vendor is going to support that use for them so it is a moot point.
Paul Prescod - http://itrc.uwaterloo.ca/~papresco
The United Nations Declaration of Human Rights will be 50 years old on
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http://www.udhr.org/history/default.htm