 for the target dependency representation that are indicated in the SEI message. The value num_non_required_layer_reps_minus1[i shall be in the range of 0 to 127, inclusive. non_required_layer_rep_dependency_id[i]j] indicates the value of dependency_id of the j-th non-required layer representation for the target dependency representation. non_required_layer_rep_quality_id[i][j] indicates the value of quality_id of the j-th non-required layer representation for the target dependency representation. The i-th non-required layer representation for the target dependency representation is the layer representation of the primary coded picture that has dependency id equal to non_required_layer_rep_dependency_id[i][j] and quality_i id equal to non_required_layer_rep_quality_id[i][j] A non-required layer representation for the target dependency representation is not required for decoding the target dependency representation and any dependency representation with dependency_i equal to entry_dependency_id[i of primary coded pictures that follow the current primary picture in decoding order. When DependencyIdMax is equal to entry_dependency_id[i i , the VCL NAL units of the non-required layer representations shall not be referenced through inter or inter-layer prediction in the decoding process as specified in clause G.8. NOTE - In addition to the i-th non-required layer representation for the target dependency representation, those layer representations that have dependency equal to non_required_layer_rep_dependency_id[i][j] and quality_id greater than non_required_layer_rep_quality_id[i] are also non-required layer representations for the target dependency representation. The i-th non-required layer representation may or may not be present in the access unit. G.13.2.4 Priority layer information SEI message semantics The priority layer information SEI message provides a mechanism for signalling alternative priority_id values for VCL NAL units of the primary coded picture. The alternative values for priority_id indicate prior