Re: [sipcore] draft-barnes-sipcore-rfc4244bis - hi-targeted-to-uri

The reason is so that the URI is enclosed in <> which then allows us
to separate the URI parameters from the History-Info parameters.

For example, if we allowed addr-spec, there would be no
clean way to know if a parameter (say "index") was a
URI parameter, or a History-Info parameter.

Now, if you look at the definition of the Contact header,
it has the same problem. Contact can be either
name-addr / addr-spec however. So what we did in 3261 is
include text in 20.10 that says "If no "<" and ">" are 
present, all parameters after the URI are header parameters,
not URI parameters.".

I guess we could have done something similar here, but as you
can see, it it very nasty logic. Furthermore, since H-I very
often includes header parameters, the value of allowing 
addr-spec ends up being very low (i.e., you only same a couple
of letters "<" and ">" in only simple circumstances.

Therefore, using always the "<" ">" makes it much cleaner and
simpler, and easier to parse.

> -----Original Message-----
> From: Barnes, Mary (RICH2:AR00) 
> Sent: Friday, July 10, 2009 09:15
> To: OKUMURA Shinji; sipcore@ietf.org
> Cc: Audet, Francois (SC100:3055)
> Subject: RE: [sipcore] draft-barnes-sipcore-rfc4244bis - 
> hi-targeted-to-uri
> 
> Hi Shinji,
> 
> I honestly can't remember if there was a specific reason why 
> we used just name-addr, other than it also encompasses the 
> addr-spec so you get consistency in the format for the field. 
> I'd welcome other opinions on this. 
> 
> Thanks,
> Mary. 
> 
> -----Original Message-----
> From: sipcore-bounces@ietf.org 
> [mailto:sipcore-bounces@ietf.org] On Behalf Of OKUMURA Shinji
> Sent: Friday, July 10, 2009 1:42 AM
> To: sipcore@ietf.org
> Subject: [sipcore] draft-barnes-sipcore-rfc4244bis - 
> hi-targeted-to-uri
> 
> Hi,
> 
> I have one suggestion.
> 
> In the draft hi-targeted-to-uri is defined as follows
> 
> hi-targeted-to-uri = name-addr
> 
> If there is no special reason for the restriction, I think 
> addr-spec should be added as follows
> 
> hi-targeted-to-uri = name-addr/addr-spec
> 
> Regards,
> Shinji
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