| Documentation |
<Definition> A reference number ID used in the IM deployment to refer uniquely to an object (persons, vehicles, resources, data structures, etc.) used in the IM deployment and exchanged between centers (i.e. its existence is exposed between two or more centers and it can be uniquely referred to by this number). The lifetime of the object will vary by its context but it will persist at least until the end of the objects involvement in the event. More typically it will last until the end of the event, although some deployment may persist an object longer for various records keeping reasons. Reference numbers for objects are created when they become involved with an event. For example an incident object (and its reference number) is created when an incidence event is declared, a tow truck vehicle may be given a reference number at the time it is assigned as an involved resource to this event. Objects which physically exist in the real world (such as vehicles) may have other assigned numbering systems as well (such as a fleet or squad car number) and the issuing center may chose to use these "permanent" numbers as the reference number for such vehicles if they so desire.</Definition>
<Remarks> In the prior work there are many reference numbering systems being used. Over time all of these numbering systems will either user this definition or be derived from it. While the definition provides a case sensitive reference system, it is suggested that local deployments create case-insensitive values and use human readable base names when conditions allow (i.e. terms like "Car-54" are to be preferred over an unreadable "12m45o4dc").</Remarks>
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