| annotation | | documentation |  | A unique, unambiguous reference or identifier for a resource within a given context. Best practice is to identify the resource (whether analogue or
 digital) by means of a string or number corresponding to an established or formal
 identification system if one exists. Otherwise, use an identification method that is
 in use within your agency, station, production company, office, or institution. It
 is also possible to enter different but unique identifiers for the same resource.
 
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