Re: Question regarding conflicting grammar for IPV6 SIP URI andRFC 3986

> To fit a sip uri within 3986 I think you must start with:
>
> URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
>
> hier-part     = path-rootless
>
> path-rootless = segment-nz *( "/" segment )
>
> segment-nz    = 1*pchar
>
> pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
>
> unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
>
> Not only does the above exclude the IPv6 syntax, 
> it also excludes lots of other things that are 
> commonly used in the userinfo portion of sip URIs.

Like what?  The following is the sub-delims expansion:

sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" /
"="

<snip>


> Don't mailto URIs have similar problems? 
> What are they doing about it?

I assume sip is not the only URI with the issue; however I haven't
checked.  

Here is the IANA list: http://www.iana.org/assignments/uri-schemes.html
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