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Date: Wed, 19 May 1999 01:04:10 +0100
To: <drums@cs.utk.edu>
From: Graham Klyne <GK@dial.pipex.com>
Subject: obs-local-part
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I am wondering if the syntax for obs-local-part in
<draft-ietf-drums-msg-fmt-07.txt> is what was intended.  The basis for this
query is that local-part and obs-local-part do not seem to cover every
construct allowed by RFC822 for "local-part".

Specifically, I observe that the syntax for 'obs-local-part' does not allow
an address of the form <"abc"."def"@foo.com> that is allowed by RFC822.

Is this intentional?

#g
--


For reference, the syntax productions I have surveyed are listed below:

The following syntax productions are extracted from
<draft-ietf-drums-msg-fmt-07.txt>:

Section 3.4.1:
  addr-spec       =       local-part "@" domain
  local-part      =       dot-atom / quoted-string / obs-local-part

Section 3.2.4:
  atom            =       [CFWS] 1*atext [CFWS]
  dot-atom        =       [CFWS] dot-atom-text [CFWS]
  dot-atom-text   =       1*atext *("." 1*atext)

Section 4.4:
  obs-local-part  =       atom *("." atom)


The corresponding productions from RFC822 (all taken from appendix D) are:

     addr-spec   =  local-part "@" domain        ; global address
     local-part  =  word *("." word)             ; uninterpreted
     word        =  atom / quoted-string
     atom        =  1*<any CHAR except specials, SPACE and CTLs>

#g

------------
Graham Klyne
(GK@ACM.ORG)