Re: Rewrite of feature tag syntax rules

It's a common difficulty with URL processing, to the point
where we wrote a special section in the revised URL draft
on "when to escape and when not to escape". But the short
answer is that you cannot 'unescape' a URL except when you are
parsing it into its component parts. Thus, URL equivalence
using %XX = <character represented by that byte> is unacceptable. 

Look at latest draft-fielding-url-syntax-* in the internet
drafts directory.

Larry
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http://www.parc.xerox.com/masinter