The syntax rules for message identifiers are:
- The message identifier must be 7 characters long.
- It consists of two parts: the message prefix which must be 3
characters long, and the message suffix which must be 4 characters
long.
- The first character of the prefix must be alphabetic (A through Z, @, $,
and #). The next 2 characters must be alphanumeric (A through Z, 0
through 9, @, $, _, #).
- The suffix characters must be numeric (0 through 9), or hexadecimal (0
through 9, A through F).
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