Here is the only answer I've had so far from my colleagues:
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As far as I know, resource/RG names, property names,
and property values have to be ascii strings (though
possibly the values could be multibyte strings as
noted in another email). I'm not sure if the
property names too could be multibyte. I'm not sure how
the character set gets rendered when someone runs
an administrative command or gui.
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I hope that is some help,
Tim