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> In that case, I could choose between xs1.0:token and xs1.1:token by
> assigning the right namespace URIs to these prefixes.
It seems to me that XML Schema Part 2 describes types such as Name and
NCName by intent rather than by extent: that is, it says that they are
designed to hold XML names, rather than that they permit a given set of
characters. Even the patterns that define them in the S2S use the
metacharacters \i and \c which are defined by reference to the XML
specification. In the case of character classes mapped to Unicode
properties, the spec is explicit that if Unicode changes, the definition of
the character classes changes too. Therefore, it doesn't seem an
unreasonable extrapolation to say that \i and \c should evolve in meaning as
the base spec evolves.
With all these things, I think one has to ask what is the approach that
causes the least amount of pain to the average user. Asking everyone to
change a namespace URI so that a few users can identify clearly whether or
not their patterns are intended to match Ethiopian letters isn't a net win.