SUBJECT

This is description of a mid level message protocol used 
in LanChat (http://sourceforge.net/projects/vnlanchat) and
in some other of my progs.  This protocol relies on my datagram
protocol as transport (see low_level_protocol.txt).  This protocol
(it also got no name yet) supports transferring messages using
datagrams.


MESSAGE FORMAT

A datagram's body is a plain text string. The string can contain
either one or several messages, in any case message is ending
with a semicolon ';'.
A message body is a list of pairs 'ID'='Value' delimited by
whitespaces.
Here, 'ID' is any valid ID: consists of latin letters,
digits, and underscores, starts with a letter or underscore, must
be no longer than 30 symbols. ID names ARE NOT case sensitive.
'Value' may be a decimal, hexadecimal or octal C-like constant,
or a C-like string, embraced by doublequotes '"'.


SYNTAX

The syntax definition presented in a widely used notation
is given below.

<datagram body> ::= <message> |
                    <datagram body> <message>

<message> ::= <message body> ';'

<message body> ::= <pair> |
                   <message body> <pair>

<pair> ::= <id> '=' <value>

<id> ::= <letter or underscore> |
         <letter or underscore> <letter or underscore or digit>

<value> ::= <C-like integer constant> |
            <C-like string constant>



Sla/n agus beannacht leat!
Vaclav.