What if:

["Al B. Snell" <alaric@alaric-snell.com>]

...I used a mailto: URL as a namespace URI?

I know the standard does not define anything about what namespace URIs
point to, but what would people's gut feelings about the semantics of such
a beast be?

Presumably you could email that address to ask questions about the schema!

Also, a news: URL (the kind with a message ID in it) would be an easy way
to get a unique URI without needing to own a DNS domain :-)

Just wondering...

ABS

-- 
                               Alaric B. Snell
 http://www.alaric-snell.com/  http://RFC.net/  http://www.warhead.org.uk/
   Any sufficiently advanced technology can be emulated in software