Common Profile for Instant Messaging (CPIM)
draft-ietf-impp-im-04

The RFC-Editor note doesn't address two of my comments:
- One of the UCS-high definitions uses non-ABNF syntax (this is arguably a flaw in ABNF)
- The use of a modified case-sensitive ABNF

I'm willing to discuss the importance of these and will defer my concerns if the rest of the IESG is OK.

draft RFC-editor note for draft-ietf-impp-cpim-msgfmt-08:

Section 3.6:


(substituting '%x' for '%' throughout NAMECHAR)
OLD:

                  ; Any US-ASCII char except ".", CTLs or SEPARATORS:
      NAMECHAR    = %21 / %23-27 / %2a-2b / %2d / %5e-60 / %7c / %7e
                  / ALPHA / DIGIT

NEW:

                  ; Any US-ASCII char except ".", CTLs or SEPARATORS:
      NAMECHAR    = %x21 / %x23-27 / %x2a-2b / %x2d / %x5e-60 / %x7c / %x7e
                  / ALPHA / DIGIT

(changing '<">' to '%x22' in SEPARATORS)
OLD:


      SEPARATORS  = "(" / ")" / "<" / ">" / "@"    ; 28/29/3c/3e/40
                  / "," / ";" / ":" / "" / <">    ; 2c/3b/3a/5c/22
                  / "/" / "[" / "]" / "?" / "="    ; 2f/5b/5d/3f/3d
                  / "{" / "}" / SP                ; 7b/7d/20

NEW:


      SEPARATORS  = "(" / ")" / "<" / ">" / "@"    ; 28/29/3c/3e/40
                  / "," / ";" / ":" / "" / %x22    ; 2c/3b/3a/5c/22
                  / "/" / "[" / "]" / "?" / "="    ; 2f/5b/5d/3f/3d
                  / "{" / "}" / SP                ; 7b/7d/20

Section 4.5:

(capitalizing 'lang-param')
OLD:

      Subject-header = "Subject" ":" [ ";" lang-param ] SP *HEADERCHAR

NEW:

      Subject-header = "Subject" ":" [ ";" Lang-param ] SP *HEADERCHAR
                                          ^^

The abstract and first section both say that "Today...little interperability...has been achieved."  While that's probably true _today_, is that really something that we want to say at the top of a standard that will hopefully live for many years?