ccess unit set of a scalability information SEI message and the corresponding scalability information SEI message contains information for a scalable layer i with layer identifier layer_id equal to layer_id, which is referred to as the current scalable layer in the following, the following applies. The information for the current scalable layer in the scalability SEI shall contain sub_pic_layer_flag[i equal to 1. The sub-picture area for the current scalable layer i, which is specified by the syntax elements horizontal_offset ], vertical_offset[ ], region_width[i] and region_height[ in the scalability information SEI message, shall be identical to the area specified by the associated slice group set. G.13.2.3 Non-required layer representation SEI message semantics The non-required layer representation SEI message provides a mechanism for indicating which layer representations of the current primary coded picture are not required for decoding dependency representations with a particular value of dependency_io of the current primary coded picture and succeeding primary coded pictures, in decoding order. The non-required layer representation SEI message shall not be included in a scalable nesting SEI message. num_info_entries_minus1 plus 1 specifies the number of dependency values for which non-required layer representations are indicated in the SEI message. The value of num_info_entries_minus1 shall be in the range of 0 to 7, inclusive. entry_dependency_id|i specifies the dependency_io value for which non-required layer representations are indicated by the following syntax elements. The instances of entry_dependency_id[ shall appear in increasing order of their values. The dependency representation of the primary coded picture with dependency_id equal to entry_dependency_id[i] is referred to as the target dependency representation. The target dependency representation may or may not be present in the access unit. hum_non_required_layer_reps_minus1[i] plus 1 specifies the number of non-required layer representations