Write message

Purpose: Write key/value to a message.

 write-message <message>  key <key> value <value>

write-message will append to <message> a key/value pair, in the form of string <key> (in "key" clause) and string <value> (in "value" clause).

<message> must have been created with new-message. In order to use write-message, a message must not have been read from (see read-message).

Examples

 new-message msg
 write-message msg key "key1" value "value1"