[ietf-dkim] dkim-base-03 key-*-tag minor issues

I noticed a few minor issues about key-*-tag on dkim-base-03.

#1 Section 3.6.1, key-g-tag includes CFWS which obscures the local-part 
the verifier really need, and is needless for this tag. CFWS should be 
excluded (and comments should be noted with key-n-tag).

[dkim-base-03]
  key-g-tag-lpart = [dot-atom] ["*"] [dot-atom]

should be like

  key-g-tag-lpart = [dot-atom-text] ["*"] [dot-atom-text]

(or 2821-Local-part/2821-Dot-string might be more appropriate.)

[rfc2821]
  Local-part = Dot-string / Quoted-string
  Dot-string = Atom *("." Atom)
  Atom = 1*atext
  Quoted-string = DQUOTE *qcontent DQUOTE

[rfc2822]
  dot-atom        = [CFWS] dot-atom-text [CFWS]
  dot-atom-text   = 1*atext *("." 1*atext)


#2 Section 3.6.1, key-p-tag permits empty value for revoking. So

  key-p-tag    = %x70 [FWS] "=" [FWS] base64string

should be like

  key-p-tag    = %x70 [FWS] "=" [ [FWS] base64string ]


#3 Section 3.6.1, key-h-tag default value (= allowing all algorithms) 
should be able to be specified explicitly. So

  key-h-tag-alg   = "sha1" / "sha256" / x-key-h-tag-alg

should be like

  key-h-tag-alg   = "sha1" / "sha256" / "*" / x-key-h-tag-alg


--
SUZUKI Takahiko <takahiko(_at_)iij(_dot_)ad(_dot_)jp>
Internet Initiative Japan Inc.
_______________________________________________
NOTE WELL: This list operates according to 
http://mipassoc.org/dkim/ietf-list-rules.html