Parsing the Injection-Info: header field

Hi,

I follow a discussion that was initiated in news.software.nntp:

    http://groups.google.fr/group/news.software.nntp/browse_frm/thread/c7=
04d0859dd84d38
    <news:[email protected]>


According to Section 3.2.8 of RFC 5536:


   injection-info  =3D  "Injection-Info:" SP [CFWS] path-identity
                      [CFWS] *( ";" [CFWS] parameter ) [CFWS] CRLF

      NOTE: The syntax of <parameter> (Section 5.1 of [RFC2045], as
      amended by [RFC2231]), taken in conjunction with the folding rules
      of [RFC0822] (note: not [RFC2822] or [RFC5322]), effectively
      allows [CFWS] to occur on either side of the "=3D" inside a
      <parameter>.


I do not understand well that point.
Does it mean that CFWS is allowed both before and after the "=3D"?
Why should RFC 822 be followed here?  And why doesn't RFC 5322 mention
that?

I thought that RFC 5536 was based upon RFC 5322 and therefore would
not allow a space before "=3D", and would allow a space after "=3D" only
if <value> is a quoted-string.



Just afterwards:


   <attribute>              format of <value>
   --------------------     -----------------
   "posting-host"           a <host-value>
   "posting-account"        any <value>
   "logging-data"           any <value>
   "mail-complaints-to"     an <address-list>

      NOTE: Since any such <host-value> or <address-list> also has to be
      a syntactically correct <value>, it will usually be necessary to
      encapsulate it as a <quoted-string>, for example:

       posting-host =3D "posting.example.com:192.0.2.1"


So it shows that a space is allowed before "=3D".
Isn't it a difference with RFC 5322 that ought to be mentioned in appendi=
x C?

When it is said that <host-value> is encapsulated as a <quoted-string>, d=
oes
it mean that:

posting-host =3D "pos\ting.example.com"
posting-host =3D   (Comment)   "posting.example.com"  (Comment)

are two valid values for this parameter?  (Both being "posting.example.co=
m".)



Incidentally, I do not know how to parse

posting-host=3D"20bd:20bd::1"

It could be the IPv6 address "20bd:20bd::1" or the host name "20bd" assoc=
iated
with the IPv6 address "20bd::1"!

--=20
Julien =C9LIE

=AB En v=E9rit=E9, le chemin importe peu, la volont=E9 d'arriver suffit =E0=
 tout. =BB