Re: [cuss] ABNF in UUI documents

Keith,

We are establishing a registry for purpose/package values.
IMO you should use that for "isdn-uui", rather than extending the syntax 
to include it.

	Thanks,
	Paul

On 2/20/13 7:04 AM, DRAGE, Keith (Keith) wrote:
> I make the ABNF more formal in the UUISDN document, and that requires a change to the UUI document.
>
> Currently section 11 of draft-ietf-cuss-sip-uui-isdn-04 defines.
>
> 11.  Coding requirements
>
>     This document defines "isdn-uui" as a new value of the User-to-User
>     "purpose" header field parameter.
>
>     This document defines "isdn-uui" as a new value of the User-to-User
>     "content" header field parameter.  A content value of "isdn-uui"
>     indicates that the contents have a first octet that is a protocol
>     discriminator (see table 4-26 of ITU-T Recommendation Q.931) [Q931]
>     followed by uui-data that can be subject to a length limitation
>     (before encoding or after decoding) that is generally 128 octets.
>
> My question is whether this should define BNF to add this to the BNF of draft-ietf-cuss-sip-uui which is currently.
>
>          UUI         = "User-to-User" HCOLON uui-value *(COMMA uui-value)
>          uui-value   = uui-data *(SEMI uui-param)
>          uui-data    = token / quoted-string
>          uui-param   = pkg-param / cont-param / enc-param / generic-param
>          pkg-param   = "purpose" EQUAL token
>          cont-param  = "content" EQUAL token
>          enc-param   = "encoding" EQUAL ("hex" / token)
>
> If we did this I guess it would look something like:
>
>          pkg-param   = "purpose" EQUAL "isdn-uui" / token
>          cont-param  = "content" EQUAL "isdn-uui" / token
>
> Originally I was thinking we could do something like
>
> 	pkg-param-value /= "isdn-uui"
>
> but that would require an update to draft-ietf-cuss-sip-uui to do:
>
>          pkg-param   = "purpose" EQUAL pkg-param-value
> 	  pkg-param-value = token
>
> Can we make this change to the UUI document, and I'll then follow through with the UUI ISDN document?
>
> regards
>
> Keith
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