RFC 0806
Proposed Federal Information Processing Standard: Specification for message format for computer based message systems
Property (OPTIONAL) 45 105
16 8
constructor
This data element uses a Qualifier data element
component. The Qualifier component contains
a Property-Identifier (PID) to indicate which specific
property is being represented. (See Section 4.3.3.)
+--------+---//---+---//---+---//---+
|P1000101|Lxxxxxxx|Qxxxxxxx|elements|
+--------+---//---+---//---+---//---+
Sequence (OPTIONAL) 0A 012
16 8
constructor
This data element contains any series of data elements.
Sequence differs from Set in that the data elements
making up the Data Element Contents must be considered
as an ordered sequence (according to their order of
appearance in the sequence.)
+--------+---//---+---//---+
|P0001010|Lxxxxxxx|elements|
+--------+---//---+---//---+
Set (OPTIONAL) 0B 013
16 8
constructor
This data element contains any series of data elements
with no ordering of the elements implied. (Sequence
provides an ordered series.) Although the data
elements contained in a Set must be stored
sequentially, the order in which they are stored is not
defined and not processed.
+--------+---//---+---//---+
|P0001011|Lxxxxxxx|elements|
+--------+---//---+---//---+
Unique-ID (OPTIONAL) 09 011
16 8
constructor
This data element is a unique identifier. It need not
be human-readable. The Data Element Contents may be an
ASCII-String, a Bit-String, or an Integer.
+--------+---//---+---//---+
|P0001001|Lxxxxxxx| element|
+--------+---//---+---//---+
Vendor-Defined (OPTIONAL) 7F 177
16 8
constructor
This data element is used to represent vendor-defined
data elements. A Qualifier component extends the
encoding space for identifiers. The Qualifier
component is not guaranteed to be unique among all
interconnected ems. This data element is
interpreted according to prior agreement between
systems. (Extension and Vendor-Defined data elements
have the same syntax.)
+--------+---//---+---//---+---//---+
|P1111111|Lxxxxxxx|Qxxxxxxx|Anything|
+--------+---//---+---+---//---+
APPENDIX C
DATA ELEMENT IDENTIFIER OCTETS
Identifier Identifier Data Element Name
00 000 No-Op
01 001 End-of-Constructor
02 002 ASCII-String
08 010 Boolean
09 011 Unique-ID
0A 012 Sequence
0B 013 Set
20 040 Integer
21 041 Padding
24 044 Property-List
28 050 Date
43 103 Bit-String
45 105 Property
46 106 Compressed
47 107 Encrypted
4C 114 Field
4D 115 Message
7E 176 Extension
7F 177 Vendor-Defined
APPENDIX D
SUMMARY OF MESSAGE FIELDS BY COMPLIANCE CATEGORY
This appendix is for reference use. It contains no new
information, but rather abstracts from that presented in Section
3.1.
This appendix contains the message field names arranged
alphabetically within compliance category. (Appendix E orders
the field names within functional category.) Complete field
definitions appear in Appendix A.
Required fields must appear in a message. Basic fields must
be recognized and processed by all CBM systems. Optional fields
need not be supported by a CBMS but, if supported, must be
processed according to the meanings defined by the message format
specification.
D.1 REQUIRED Fields
From
Posted-Date
To
D.2 BASIC Fields
Cc
Reply-To
Subject
Text
D.3 OPTIONAL Fields
Attachments
Author
Bcc
Circulate-Next
Circulate-To
Comments
Date
End-Date
In-Reply-To
Keywords
Message-Class
Message-ID
Obsoletes
Originator-Serial-Number
Precedence
Received-Date
Received-From
References
Reissue-Type
Sender
Start-Date
Warning-Date
APPENDIX E
SUMMARY OF MESSAGE SEMANTICS BY FUNCTION
This appendix is for reference use. It contains no new
information, but rather abstracts from that presented in Section
3.1.
This appendix contains the message field names arranged
alphabetically within functional class. (Appen orders the
field names within compliance class.) Complete field definitions
appear in Appendix A.
E.1 Circulation
Circulate-Next
Circulate-To
E.2 Cross Referencing
In-Reply-To
Message-ID
Obsoletes
Originator-Serial-Number
References
E.3 Life spans
End-Date
Start-Date
Warning-Date
E.4 Delivery System
Received-Date
Received-From
E.5 Miscellaneous Fields Used Generally
Attachments
Comments
Keywords
Message-Class
Precedence
Subject
Text
E.6 Reply Generation
Reply-To
E.7 Reissuing
Reissue-Type
E.8 Sending (Normal Transmission)
Author
Bcc
Cc
Date
From
Posted-Date
Sender
To
APPENDIX F
SUMMARY OF DATA ELEMENT SYNTAX
This appendix summarizes data element syntax by diagramming
the components of data elements. Detailed presentation of data
element syntax appears in Section 4.3.1.
In these diagrams, required components of a data element
appear as follows. (The double border signifies "required".)
+========+ +===//===+
| | | |
+========+ +===//===+
always one one or more
octet long octets long
Optional components of data elements are represented as
follows. (The single border signifies "not required".)
+--------+ +---//---+
| | | |
+--------+ +---//---+
always one one or more
octet long octets long
The first octet in a data element is the identifier octet.
In diagrams of data elements, all eight bits of the identifier
octet are always shown. Bits with fixed values show the fixed
values as 1s and 0s. Bits with variable values are shown as x's
and y's.
The first bit in an identifier octet is the P-bit. Its
value indicates whether a data element contains a property list.
(A P-bit value of 1 indicates the presence of a property list.)
The remaining seven bits contain the rest of the identifier.
Other octets in a data element belong to one of four
classes, Length Code, Qualifier, Property-List, and Contents. In
diagrams of syntax the data element components are labeled
according to their class.
Component Class Label
Length code Length
Qualifier Qual
Property-List P-List
Contents Contents
Data elements must follow this form.
+========+===//===+---//---+---//---+---//---+
|Pxxxxxxx| Length | Qual | P-List |contents|
+========+===//===+---//---+---//---+---//---+
The value of the Length component is the total number of octets
following the length code octet in the data element.
APPENDIX G
SUMMARY OF DATA ELEMENTS BY COMPLIANCE CATEGORY
Compliance categories for syntactic elements are basic and
optional. Every CBMS is required to recognize and process basic
elements. A CBMS is not required to process optional elements
although many are strongly recommended by the semantics.
This appendix summarizes data elements by listing them
according to their compliance category.
G.1 BASIC Data Elements
ASCII-String (primitive) 02 002
16 8
Date (constructor) 28 050
16 8
End-Of-Constructor (primitive) 01 001
16 8
Field (constructor) 4C 114
16 8
Message (constructor) 4D 115
16 8
G.2 OPTIONAL Data Elements
Bit-String (primitive) 43 103
16 8
Boolean (primitive) 08 010
16 8
Compressed (constructor) 46 106
16 8
Encrypted (constructor) 47 107
16 8
Extension (constructor) 7E 176
16 8
Integer (primitive) 20 040
16 8
No-Op (primitive) 00 000
16 8
Padding (primitive) 21 041
16 8
Property (constructor) 45 105
16 8
Property-List (constructor) 24 044
16 8
Sequence (constructor) 0A 012
16 8
Set (constructor) 0B 013
16 8
Unique-ID (constructor) 09 011
16 8
Vendor-Defined (constructor) 7F 377
16 8
APPENDIX H
EXAMPLES
This appendix presents at least one example for each of the
data elements defined in this message format specification. In
these examples, identifier octets are represented in binary form.
All other numbers are presented in hexadecimal. ASCII strings
are shown as characters rather than their numerical
representation. Although this message format specification does
not define the syntax of names and addresses, message originators
and recipients are identified by their names. This does not
imply anything about how naming and addressing can or should be
done; it is simply a convenient way to identify message
originators and recipients in these examples.
H.1 Primitive Data Elements
This section contains an example of each of the primitive
data elements. Each example contains a short explanation and a
series of octets.
No-Op data element:
+--------+--------+
|00000000|00000000|
+--------+--------+
End-of-Constructor data element:
+--------+--------+
|00000001|00000000|
+--------+--------+
Boolean data element whose value is true:
+--------+--------+--------+
|00001000|00000001|11111111|
+--------+--------+--------+
Integer data element containing five octets of data. Its
value is 4,294,967,296 (decimal):
+--------+--------+--------+--------+--------+
|00100000| 0 5 | 0 1 0 0 0 0
+--------+--------+--------+--------+--------+
+--------+--------+
0 0 0 0 |
+--------+--------+
Padding data element containing three octets of padding.
The values of those three octets are meaningless:
+--------+--------+--------+--------+--------+
|00100001| 0 3 | F F F F F F |
+--------+--------+--------+--------+--------+
ASCII-String data element containing nine characters. Its
value is "Hi There.":
+--------+--------+---- ----+
|00000010| 0 9 |Hi There.|
+--------+--------+---- ----+
Bit-String data element containing 44 bits of data (((7-1) x
8) - 4). Six octets are used to hold those 44 bits. The last 4
bits in the final octet are padding and are therefore ignored.
Bit-String Length Spare
+--------+--------+--------+--------+--------+
|01000011| 0 7 | 0 4 | 0 A 3 B
+--------+--------+--------+--------+--------+
+--------+--------+--------+--------+
5 F 2 9 1 C D 0 |
+--------+--------+--------+--------+
H.2 Constructor Data Elements
This section contains an example of each of the constructor
data elements. Each example contains a short explanation and
then an annotated series of the data elements making up the
constructor.
Property-List data element containing one Property data
element. The property is Printing-Name and its value is
"Distribution":
Prop-List Length Property Length PID
+--------+--------+--------+--------+--------+
|00100100| 1 1 |01000101| 0 F | 0 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 0 C |Distribution|
+--------+--------+---- ----+
Printing-Name Property. The value of the Printing-Name is
"Distribution":
Property Length PID ASCII Length
+--------+--------+--------+--------+--------+
|01000101| 0 F | 0 2 |00000010| 0 C |
+--------+--------+--------+--------+--------+
+---- ----+
|Distribution|
+---- ----+
Compressed data element. Its contents were compressed using
an as-yet-undefined NBS standard data compression algorithm. The
compressed data is in a bit-string that is 56 bits long, fully
filling 7 octets:
Compressed Length CID Bit-String Length
+--------+--------+--------+--------+--------+
|01000110| 0 B | 0 1 |01000011| 0 8 |
+--------+--------+--------+--------+--------+
Spare
+--------+--------+--------+--------+
| 0 0 | 1 C 5 F 2 D
+--------+--------+--------+--------+
+--------+--------+--------+--------+
7 7 B A F 6 2 9 |
+--------+--------+--------+--------+
Encrypted data element. The encryption method used to
encrypt its contents has been intentionally not specified. This
element contains a Bit-String which contains 22 bits (((4-1) x 8)
- 2) of data. These 22 bits are represented in octets; the final
2 bits in the final octet are padding and are therefore ignored:
Encrypted Length EID Bit-String Length
+--------+--------+--------+--------+--------+
|01000111| 0 7 | 0 0 |01000011| 0 4 |
+--------+--------+--------+--------+--------+
Spare
+--------+--------+--------+--------+
| 0 2 | A 3 7 8 1 C |
+--------+--------+--------+--------+
Date data element. This example includes a date but no
time. The date shown in this example is August 15, 1980:
Date Length ASCII Length
+--------+--------+--------+--------+--- ---+
|00101000| 0 A |00000010| 0 8 |19800815|
+--------+--------+--------+--------+--- ---+
Unique-ID data element, which is represented as an Integer
data element whose value is 129 (decimal).
Unique-ID Length Integer Length
+--------+--------+--------+--------+--------+--------+
|00001001| 0 4 |00100000| 0 2 | 0 0 8 1 |
+--------+--------+--------+--------+--------+--------+
Sequence data element containing two ASCII-String data
elements. The first ASCII-String is "This is" while the second
string is " a list":
Sequence Length ASCII Length
+--------+--------+--------+--------+--- ---+
|00001010| 1 2 |00000010| 0 7 |This is|
+--------+--------+--------+--------+--- ---+
ASCII Length
+--------+--------+--- ---+
|00000010| 0 7 | a list|
+--------+--------+--- ---+
Set data element containing two Integer data elements. The
first integer has a value of 519 (decimal) while the value of the
second is 71 (decimal). (These two value have no ordering
because they belong to a set.)
Set Length Integer Length
+--------+--------+--------+--------+--------+--------+
|00001011| 0 8 |00100000| 0 2 | 0 2 0 7 |
+--------+--------+--------+--------+--------+--------+
Integer Length
+--------+--------+--------+--------+
|00100000| 0 2 | 0 0 4 7 |
+--------+--------+--------+--------+
Field data element. The specific field shown is the Text
field with the contents "I will see you at lunch.":
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 B | 0 4 |00000010| 1 8 |
+--------+--------+--------+--------+--------+
+---- ----+
|I will see you at lunch.|
+---- ----+
Message containing four fields, Posted-Date, From, Text, and
To. It was sent on July 4, 1980 at 6 p.m. eastern daylight time.
It is from a person named Smith. The text of the message is a
question asking the recipient "Are you going to watch the
fireworks?". The message is sent to Jones:
Message Length Type Field Length
+--------+--------+--------+--------+--------+
|01001101| 5 8 | 0 1 |01001100| 1 7 |
+--------+--------+--------+--------+--------+
FID Date Length ASCII
+--------+--------+--------+--------+
| 0 2 |00101000| 1 4 |00000010|
+--------+--------+--------+--------+
Length
+--------+---- ----+
| 1 2 |19800704-180000EDT|
+--------+---- ----+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 8 | 0 1 |00000010|
+--------+--------+--------+--------+
Length
+--------+-- --+
| 0 5 |Smith|
+--------+-- --+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 2 8 | 0 4 |00000010|
+--------+--------+--------+--------+
Length
+--------+
| 2 5 |
+--------+
+---- ----+
|Are you going to watch the fireworks?|
+---- ----+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 8 | 0 5 |00000010|
+--------+--------+--------+--------+
Length
+--------+-- --+
| 0 5 |Jones|
+--------+-- --+
Extension data element containing a length code and 3
octets. The octet immediately following the length code
identifies it as Extension Data Element 7. The Data Element
Contents is the final two octets. The interpretation of the Data
Element Contents would be defined in an extension or successor to
this message format specification. [Note: this is an example.
Any actual extension data element 7 (if it were ever used) would
be completely different from anything done here.]:
Extension Length
+--------+--------+--------+--------+--------+
|01111110| 0 3 | 0 7 | 4 A E 9 |
+--------+--------+--------+--------+--------+
Vendor-Defined data element containing a length code and 3
octets. The first octet identifies this as vendor-defined data
element number 114 (decimal), which this particular vendor has
defined to contain three printable ASCII characters in two
octets. (Data element 114 (decimal) for another user would be
completely different. For example, it might contain a floating
point number.):
User Length
+--------+--------+--------+--------+--------+
|01111111| 0 3 | 7 2 | P O E |
+--------+--------+--------+--------+--------+
H.3 Fields
This section contains examples of Field data element
constructors for each several different fields (Keywords, Text,
Subject, Vendor-Defined).
Field data element for keywords . The field contains two
keywords, Message and Computer, each represented in a separate
ASCII-string data element.
Field Length Keywords ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 4 | 1 4 |00000010| 0 7 |
+--------+--------+--------+--------+--------+
+--- ---+
|Message|
+--- ---+
ASCII Length
+--------+--------+--- ---+
|00000010| 0 8 |Computer|
+--------+--------+--- ---+
Field data element for Text with a Property-List data
element containing a comment attached. The text field contains
the ASCII-String data element "Do you want lunch?"; the Property-
List data element contains a comment property, which consists of
an ASCII-string data element containing "Now?":
Field Length Text Prop-List Length
+--------+--------+--------+--------+--------+
|11001100| 2 0 | 0 4 |00100100| 0 9 |
+--------+--------+--------+--------+--------+
Property Length PID ASCII
+--------+--------+--------+--------+
|01000101| 0 7 | 0 1 |00000010|
+--------+--------+--------+--------+
Length
+--------+- -+
| 0 4 |Now?|
+--------+- -+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 2 |Do you want lunch?|
+--------+--------+---- ----+
Field data element for Subject containing an ASCII-String
data element ("Good restaurants in Detroit" followed by a
carriage return and a line feed). (A recipient would expect the
message to contain some information about restaurants in the
Detroit area.):
Field Length Subject ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 2 1 | 0 7 |00000010| 1 E |
+--------+--------+--------+--------+--------+
+---- ----+
|Good restaurants in Detroit.<cr><lf>|
+---- ----+
Field data element whose form and meaning was defined by a
vendor. This vendor has defined vendor-defined field 12
(decimal) to be a field with a printing name of "Reply-by" and
contents consisting of a date; January 7, 1981 in this case.
(The meaning of vendor-defined field 12 is unique to the vendor;
the same field number would have different meaning for other
vendors.):
Field Length Qualifier User number
+--------+--------+--------+--------+--------+
|11001100| 1 F | 8 2 | 0 0 0 C |
+--------+--------+--------+--------+--------+
Prop-List Length Property Length
+--------+--------+--------+--------+
|00100100| 0 E |01000101| 0 C |
+--------+--------+--------+--------+
PID ASCII Length
+--------+--------+--------+---- ----+
| 0 2 |00000010| 0 9 |Reply-By:|
+--------+--------+--------+---- ----+
Date Length ASCII Length
+--------+--------+--------+--------+
|00101000| 0 A |00000010| 0 8 |
+--------+--------+--------+--------+
+--- ---+
|19810107|
+--- ---+
H.4 Messages
This section contains several examples of complete messages
and shows the results of reissuing a message. (See Section
3.2.2.)
The following sample message had Stevens as its originator
and Johnson as its recipient. The message was sent on August 14,
1980 at 10 am EDT. The subject of the message is "Project
Deadline" and the message is a reminder that the deadline is the
next day and that the section of the report for the project being
done by Johnson should be turned in to Stevens by 3 pm that day.
Message Length Type
+--------+--------+--------+--------+
|01001101| 8 1 | B 4 | 0 1 |
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 5 |00000010|
+--------+--------+--------+--------+
Length
+--------+--- ---+
| 0 7 |Johnson|
+--------+--- ---+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 1 |00000010|
+--------+--------+--------+--------+
Length
+--------+--- ---+
| 0 7 |Stevens|
+--------+--- ---+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 3 | 0 7 |00000010| 1 0 |
+--------+--------+--------+--------+--------+
+---- ----+
|Project Deadline|
+---- ----+
Field Length FID Date Length
+--------+--------+--------+--------+--------+
|01001100| 1 5 | 0 2 |00101000| 1 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 0 |19800814-1000EDT|
+--------+--------+---- ----+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 6 D | 0 4 |00000010| 6 A |
+--------+--------+--------+--------+--------+
+----
|Don't forget the project report is
+----
due tomorrow. Please have<CrLf>
your section to me by three this
----+
afternoon.|
----+
The following example illustrates the results of reissuing
the first message in this section. This message contains the
original message (as a Message data element), To, From, and
Posted-Date fields, and a Reissue-Type field with Redistributed
as its value:
Message Length Type
+--------+--------+--------+--------+
|01001101| 8 1 | F 8 | 0 1 |
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 9 | 0 5 |00000010|
+--------+--------+--------+--------+
Length
+--------+-- --+
| 0 6 |Cooper|
+--------+-- --+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 1 |00000010|
+--------+--------+--------+--------+
Length
+--------+--- ---+
| 0 7 |Johnson|
+--------+--- ---+
Field Length FID Date Length
+--------+--------+--------+--------+--------+
|01001100| 1 5 | 0 2 |00101000| 1 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 0 |19800814-1030EDT|
+--------+--------+---- ----+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 0 | 2 5 |00000010| 0 D |
+--------+--------+--------+--------+--------+
+---- ----+
|Redistributed|
+---- ----+
Message Length Type
+--------+--------+--------+--------+
|01001101| 8 1 | B 4 | 0 1 |
+--------+--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 5 |00000010|
+--------+--------+--------+--------+
Length
+--------+--- ---+
| 0 7 |Johnson|
+--------+--- ---+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 1 |00000010|
+--------+--------+--------+--------+
Length
+--------+--- ---+
| 0 7 |Stevens|
+--------+--- ---+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 3 | 0 7 |00000010| 1 0 |
+--------+--------+--------+--------+--------+
+---- ----+
|Project Deadline|
+---- ----+
Field Length FID Date Length
+--------+--------+--------+--------+--------+
|01001100| 1 5 | 0 2 |00101000| 1 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 0 |19800814-1000EDT|
+--------+--------+---- ----+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 6 D | 0 4 |00000010| 6 A |
+--------+--------+--------+--------+--------+
+----
|Don't forget the project report is
+----
due tomorrow. Please have<CrLf>
your section to me by three this
----+
afternoon.|
----+
H.5 Unknown Lengths
This section contains two examples of data elements with an
unknown length. The two examples have been presented in sections
H.2 and H.4, but with a known rather than an unknown length.
Set data element with an unknown length containing two
Integer data elements. The first integer has a value of 519
(decimal) while the value of the second is 71 (decimal). (These
two value have no ordering because they belong to a set.)
Set Length Integer Length
+--------+--------+--------+--------+--------+--------+
|00001011| 8 0 |00100000| 0 2 | 0 2 0 7 |
+--------+--------+--------+--------+--------+--------+
Integer Length
+--------+--------+--------+--------+
|00100000| 0 2 | 0 0 4 7 |
+--------+--------+--------+--------+
End-of-Con Length
+--------+--------+
|00000000|00000000|
+--------+--------+
The following sample message with an unknown length had
Stevens as its originator and Johnson as its recipient. The
message was sent on August 14, 1980 at 10 am EDT. The subject of
the message is "Project Deadline" and the message is a reminder
that the deadline is the next day and that the section of the
report for the project being done by Johnson should be turned in
to Stevens by 3 pm that day.
Message Length Type
+--------+--------+--------+
|01001101| 8 0 | 0 1 | +--------+--------+--------+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 5 |00000010|
+--------+--------+--------+--------+
Length
+--------+--- ---+
| 0 7 |Johnson|
+------- ---+
Field Length FID ASCII
+--------+--------+--------+--------+
|01001100| 0 A | 0 1 |00000010|
+--------+--------+--------+--------+
Length
+--------+--- ---+
| 0 7 |Stevens|
+--------+--- ---+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 1 3 | 0 7 |00000010| 1 0 |
+--------+--------+--------+--------+--------+
+---- ----+
|Project Deadline|
+---- ----+
Field Length FID Date Length
+--------+--------+--------+--------+--------+
|01001100| 1 5 | 0 2 |00101000| 1 2 |
+--------+--------+--------+--------+--------+
ASCII Length
+--------+--------+---- ----+
|00000010| 1 0 |19800814-1000EDT|
+--------+--------+---- ----+
Field Length FID ASCII Length
+--------+--------+--------+--------+--------+
|01001100| 6 D | 0 4 |00000010| 6 A |
+--------+--------+--------+--------+--------+
+----
|Don't forget the project report is
+----
due tomorrow. Please have<CrLf>
your section to me by three this
----+
afternoon.|
----+
End-of-Con Length
+--------+--------+
|00000000|00000000|
+--------+--------+
REFERENCES
[BlaR-80]
R. P. Blanc and J. F. Heafner. The NBS Program in Computer
Network Protocol Standards. In Proceedings, ICCC 80. 1980.
[CroD-77]
David H. Crocker, John J. Vittal, Kenneth T. Pogran,
D. Austin Henderson, Jr. Standard for the Format of ARPA
Network Text Messages. RFC 733, The Rand Corporation, Bolt
Beranek and Newman Inc, Massachussets Institute of
Technology, Bolt Beranek and Newman Inc., November, 1977.
[FeiE-79]
E. Feinler, J. Pickens, and A. Sjoberg. Computer Message
Services Bibliography. Technical Report NIC-BIBLIO-791201,
SRI International, December, 1979.
[ISOD-79]
ISO/TC97/SC6 Data Communications. Second Draft Proposed
Communication Heading Format Standard. ISO/TC97/SC6 N 1948,
ISO International Organization for Standardization
Organization Internationale de Normalisation, September,
1979. Secretariat: USA (ANSI).
[ISOD-81]
ISO/TC97/SC16. Open Systems Interconnection Basic Reference
Model. ISO/TC97/SC16 N, ISO International Ozation for
Standardization Organization Internationale de
Normalisation, 1981.
[NatB-68]
National Bureau of Standards. Calendar Date. Federal
Information Processing Standards Publication 4, U.S.
Department of Commerce / National Bureau of Standards,
November, 1968.
[NatB-77]
National Bureau of Standards. Data Encryption Standard.
Federal Information Processing Standards Publication 46,
U.S. Department of Commerce / National Bureau of Standards,
January, 1977.
[NatB-79a]
National Bureau of Standards. Representations of Local Time
of the Day for Information Interchange. Federal Information
Processing Standards Publication 58, U.S. Department of
Commerce / National Bureau of Standards, February, 1979.
[NatB-79b]
National Bureau of Standards. Representations of Universal
Time, Local Time Differentials, and United States Time Zone
References for Information Interchange. Federal Information
Processing Standards Publication 59, U.S. Department of
Commerce / National Bureau of Standards, February, 1979.
[PosJ-79]
Jonathan B. Postel. INTERNET MESSAGE PROTOCOL. RFC 753,
Information Sciences Institute, March, 1979.
[SchP-79]
Peter Schicker. The Computer Based Mail Environment: An
Overview. Technical Report, Bell-Northern Research Ltd.,
Ottawa, Ontario, Canada, December, 1979.
[TasG-80]
Task Group X3S33 on Data Communications Formats, ANSI
Subcommittee X3S3 on Data Communications. Third Draft
Proposed American National Standard for Heading Format
Structure for Code Independent Communication Headings. ANSI
document X3S37/80-01, Computer and Business Equipment
Manufacturers Association, 1980.
INDEX
ASCII-String 29, 30, 42, 45, 47, 49, 53, 54, 55, 57,
59, 63
Assignment 17, 22, 55
Attachments 17, 52
Audit trail 20
Author 14, 52
BASIC 13
BASIC Data Elements
ASCII-String 42, 57
Date 45, 59
End-of-Constructor 43, 60
Field 46, 60
Message 46, 61
BASIC fields
Cc 14
Reply-To 14
Subject 17
Text 17
BASIC syntactic elements 29
Bcc 14, 19, 20, 52
Bit numbering in octets 32
Bit-String 30, 37, 42, 44, 45, 47, 57, 58, 59, 63
Boolean 30, 43, 58
Cc 14, 19, 52
Chains of correspondence 24
Circulate-Next 15, 26, 53
Circulate-To 15, 26, 53
Circulation 26
Comment 30, 31, 38, 49
Comments 18, 53
Compliance requirements 34
Compressed 31, 37, 44, 49, 58
Compression identifier 44, 58
Compression Identifiers
NBS-Standard 49
Unspecified 49
Constructor data element 29, 30
Contents 32, 70
Cross Referencing 24
Data Element Contents 37, 38, 39, 81, 36, 39, 47, 63,
36, 38, 39, 41, 42, 47, 57, 63, 81
Data Elements
ASCII-String (BASIC) 42, 57
Bit-String (OPTIONAL) 42, 57
Boolean (OPTIONAL) 43, 58
Compressed (OPTIONAL) 44, 58
Date (BASIC) 45, 59
Encrypted (OPTIONAL) 45, 59
End-of-Constructor (BASIC) 43, 60
Extension (OPTIONAL) 45, 60
Field (BASIC) 46, 60
Integer (OPTIONAL) 43, 61
Message (BASIC) 46, 61
No-Op (OPTIONAL) 44, 61
Padding (OPTIONAL) 44, 62
Property (OPTIONAL) 47, 62
Property-List (OPTIONAL) 46, 62
Sequence (OPTIONAL) 47, 63
Set (OPTIONAL) 47, 63
Unique-ID (OPTIONAL) 47, 63
Vendor-Defined (OPTIONAL) 48, 64
Date 15, 45, 53, 54, 55, 56, 59
Dating 25
Delivery 9, 15, 54
Delivery Protocol 9
Delivery Slot 9
Encapsulating 22
Encrypted 31, 37, 45, 49, 59
Encryption identifier 45, 59
Encryption Identifiers
NBS-Standard 49
Unspecified 49
End-Date 15, 25, 53, 56
End-Of-Constructor 30, 36, 39, 43, 60
Extension 41, 45, 60
Field 10, 26, 29, 30, 31, 37, 46, 60, 61, 66
Field Identifier 46, 60
Field label presentation 29
Fields
Attachments (OPTIONAL) 52, 17
Author (OPTIONAL) 52, 14
Bcc (OPTIONAL) 52, 14
Cc (BASIC) 52, 14
Circulate-Next (OPTIONAL) 53, 15
Circulate-To (OPTIONAL) 53, 15
Comments (OPTIONAL) 53, 18
Date (OPTIONAL) 53, 15
End-Date (OPTIONAL) 53, 15
From (REQUIRED) 53, 14
In-Reply-To (OPTIONAL) 53, 16
Keywords (OPTIONAL) 53, 18
Message-Class (OPTIONAL) 54, 17
Message-ID (OPTIONAL) 54, 16
Obsoletes (OPTIONAL) 54, 16
Originator-Serial-Number (OPTIONAL) 54, 16
Posted-Date (REQUIRED) 54, 15
Precedence (OPTIONAL) 54, 16
Received-Date (OPTIONAL) 54, 15
Received-From (OPTIONAL) 55, 17
References (OPTIONAL) 55, 16
Reissue-Type (OPTIONAL) 55, 17
Reply-To (BASIC) 55, 14
Sender (OPTIONAL) 55, 14
Start-Date (OPTIONAL) 55, 15
Subject (BASIC) 55, 17
Text (BASIC) 56, 17
To (REQUIRED) 56, 14
Warning-Date (OPTIONAL) 56, 15
From 12, 14, 23, 52, 53, 55
Globally unique identifiers 24
Identifier octet 33, 35, 32, 33, 36, 39, 40, 70
Identifiers
globally unique 24
In-Reply-To 16, 24, 53
Indefinite length code 35
Integer 30, 43, 47, 61, 63
Keywords 18, 53, 81
Length Code 34, 36, 32, 33, 34, 35, 36, 37, 39, 40,
70, 71, 81
Long length code 35
Message Transfer System 8, 9, 17, 54
Message 10, 12, 29, 30, 31, 37, 46, 61
Message content 9
Message envelope 9
Message stores 25
Message Transfer System 9, 17, 20, 55, 8, 9, 10, 12,
15, 16, 20, 54, 55
Message Types
NBS-Standard 50
Message-Class 17, 54
Message-ID 16, 24, 26, 53, 54, 55
NBS-Standard 49, 50
No-Op 44, 61
Numbering bits in octets 32
Obsoletes 16, 24, 54
Octets
bit numbering in 32
OPTIONAL 13
OPTIONAL Data Elements
Bit-String 42, 57
Boolean 43, 58
Compressed 44, 58
Encrypted 45, 59
Extension 45, 60
Integer 43, 61
No-Op 44, 61
Padding 44, 62
Property 47, 62
Property-List 46, 62
Sequence 47, 63
Set 47, 63
Unique-ID 47, 63
Vendor-Defined 48, 64
OPTIONAL fields
Attachments 17
Author 14
Bcc 14
Circulate-Next 15
Circulate-To 15
Comments 18
Date 15
End-Date 15
In-Reply-To 16
Keywords 18
Message-Class 17
Message-ID 16
Obsoletes 16
Originator-Serial-Number 16
Precedence 16
Received-Date 15
Received-From 17
References 16
Reissue-Type 17
Sender 14
Start-Date 15
Warning-Date 15
OPTIONAL syntactic elements 29
Originator 11, 13, 15, 25, 52, 53, 55
Originator-Serial-Number 16, 25, 54
Padding 44, 62
Person 13
Posted-Date 12, 15, 26, 53, 54
Posting 9
Posting Protocol 9
Posting Slot 9
Precedence 16, 54
Precedence categories 17
Precedence scheme 54
Presentation
field label 29
Primitive data element 30, 29, 30
Printing-Name 30, 38, 49, 76
Process 13
Properties
Comment 49
Printing-Name 49
Property 32, 37, 46, 47, 62
Property-Identifier 47, 62
Property-List 30, 32, 33, 38, 39, 40, 46, 62, 70
Qualifier 32, 33, 34, 36, 37, 39, 40, 42, 44, 45, 46,
47, 48, 57, 58, 59, 60, 62, 64, 70
Qualifiers 37
Received-Date 15, 54
Received-From 17, 55
Recipient 11, 14, 17, 52, 53, 55, 56
Redistribution 17, 22, 55
References 16, 24, 55
Reissue-Type 17, 55
Reply 13, 23
Reply-to 14, 23, 53, 55
REQUIRED 13
REQUIRED fields
From 14
Posted-Date 15
To 14
Requirements
compliance 34
Role 13
Sender 14, 26, 55
Sequence 29, 30, 47, 63
Sequences 30
Serial Numbers 16, 24, 54
Set 30, 47, 63
Short length code 35
Slot 9
Start-Date 15, 25, 55
Subject 17, 55
Syntactic reissuing 22
Text 17, 26, 56
To 12, 14, 19, 26, 30, 56
Unique identifiers 24
Unique-ID 47, 53, 54, 55, 63
Unspecified 49
User Agent 8, 9, 20
User interface 29
Vendor-Defined 41, 48, 64
Warning-Date 15, 25, 56