environments.

   This Internet naming convention allows distributed name service and
   naming authority functions at each domain.  We have specified these
   functions required at each domain.  Also discussed are implications
   on network-oriented applications, mail systems, and administrative
   aspects of this convention.














 


RFC 819                                                     August 1982;


APPENDIX A

   The BNF Specification

   We present here a rather detailed "BNF" definition of the allowed
   form for a computer mail "mailbox" composed of a "local-part" and a
   "domain" (separated by an at sign).  Clearly, the domain can be used
   separately in other network-oriented applications.

    ::=  "@" 

    ::=  | <quoted-string>

    ::=  |  

   <quoted-string> ::=  """  """

    ::=  "\"  | "\"   |  |  

    ::=  | "\" 

    ::= <naming-domain> | <naming-domain> "." 

   <naming-domain> ::=  <simple-name> | 

   <simple-name> ::=   

    ::= <let-dig-hyp> | <let-dig-hyp> 

    ::=  | 

   <let-dig-hyp> ::=  |  | "-"

    :: =  "#"  | "["  "]"

    ::=  |  

    ::=  "."  "."  "." 

    ::= one, two, or three digits representing a decimal integer
   value in the range 0 through 255

    ::= any one of the 52 alphabetic characters A through Z in upper
   case and a through z in lower case

    ::= any one of the 128 ASCII characters except  or 

    ::= any one of the ten digits 0 through 9




 


RFC 819                                                     August 1982;


    ::= any one of the 128 ASCII characters except CR, LF, quote ("),
   or backslash (\)

    ::= any one of the 128 ASCII characters (no exceptions)

    ::= "<", ">", "(", ")", "[", "]", "\", ".", ",", ";", ":", "@",
   """, and the control characters (ASCII codes 0 through 31 inclusive
   and 127)

   Note that the backslash, "\", is a quote character, which is used to
   indicate that the next character is to be used literally (instead of
   its normal interpretation).  For example, "Joe\,Smith" could be used
   to indicate a single nine character user field with comma being the
   fourth character of the field.