1. A data structure for representing metadata describing the content of at least one shot or sub-shot of information material, said data structure comprising a volume identification defining a data carrier on which said information material is contained, at least one shot identification defining said at least one shot or sub-shot within said information material, and at least one type of metadata associated with the content of the shot or sub-shot, wherein the volume identification is arranged at a first hierarchical level and the shot identification is arranged at a lower hierarchical level and said metadata describing the shot or sub-shot is arranged with respect to said shot hierarchical level.