At the very least if you're going to allow for anything other than members
of a defined set then have something defined for the undefined. Lest you
get stuck with layers of cruft trying to decipher to crude attempts the
operators will make attempting to do so on their own. Which will still be a
problem anyway.
-----Original Message-----
In my work, I've often preached that a Schema/DTD should model the business
process. When someone wants an "other" element or attribute value, it's
almost always because the business process is ill defined, sometimes
inadvertently, sometimes deliberately. So long as no one expects very much
from any machine processing of the value of an "other" element or attribute
(other than recording the value, for example). Yes, it's useless, but also
probably harmless.
Still, it's a laudable goal, Roger.