Version Number for this message content description
ID to identify the request message - if different request the request is a replacement; else it is a new request.
Which user/work position/proc/schedule the message is coming from
Keyword extracted from the directive string. Useful for routing/processing
Full directive string that includes the keyword
For application use
Indicates processing priority, if applicable
Indicates if a response is required.
Absolute or relative time can apply.
Absolute or relative time can apply.