>> I agree that getting "cut and paste" is a big usability win.  Does "_" 
>> create any other problems?
> 
>       You mean apart from it [not] being part of some character sets.

I'm sorry, I have to plead ignorance; I thought all character sets
(other than EBCDIC) were supersets of US-ASCII.

If we need to use another character, "-" / "." / "_" / "~" /
"!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="
is the set of characters that can be used without changing the
URI or IRI specs.

  Bill

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