Mapping between X.400(1988) / ISO 10021 and RFC 822

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RFC 1138               Mapping X.400(88) and 822           December 1989


5.3.3.  Basic Mappings

5.3.3.1.  Encoded Information Types

   This mapping from MTS.EncodedInformationTypes is needed in
   several disconnected places.  EBNF is defined as follows:

                encoded-info    = 1#encoded-type

                encoded-type    = built-in-eit / object-identifier

                built-in-eit    = "Undefined"         ; undefined (0)
                                / "Telex"             ; tLX (1)
                                / "IA5-Text"          ; iA5Text (2)
                                / "G3-Fax"            ; g3Fax (3)
                                / "TIF0"              ; tIF0 (4)
                                / "Teletex"           ; tTX (5)
                                / "Videotex"          ; videotex (6)
                                / "Voice"             ; voice (7)
                                / "SFD"               ; sFD (8)
                                / "TIF1"              ; tIF1 (9)

   MTS.EncodedInformationTypes is mapped onto EBNF.encoded-info.
   MTS.EncodedInformationTypes.non-basic-parameters is ignored.  Built
   in types are mapped onto fixed strings (compatible with X.400(1984)
   and RFC 987), and other types are mapped onto EBNF.object-identifier.

5.3.3.2.  Global Domain Identifier

   The following simple EBNF is used to represent
   MTS.GlobalDomainIdentifier:

                global-id = std-or-address

   This is encoded using the std-or-address syntax, for the attributes
   within the Global Domain Identifier.

5.3.4.  Mappings from the IP Message

   Consider that an IPM has to be mapped to RFC 822.  The IPMS.IPM
   comprises an IPMS.IPM.heading and IPMS.IPM.body.   The heading is
   considered first.  Some EBNF for new fields is defined:

                ipms-field = "Obsoletes" ":" 1#msg-id
                           / "Expiry-Date" ":" date-time
                           / "Reply-By" ":" date-time
                           / "Importance" ":" importance
                           / "Sensitivity" ":" sensitivity



Kille                                                          [Page 61]