<b>Definition.</b><br/>A PhysicalIdentifier is a physical object used to identify objects by men or electronic means.<br/><br/><b>Remark.</b><br/>This can be a wide variety of means for identification. Examples are:<br/>- car license plate<br/>- shield with number or designator<br/>- radio frequency identification chip<br/>- ear tag on animals<br/>- barcode label.<br/>- ....<br/><br/>