esting_flag, the following applies: If temporal_id_nesting_flag is equal to 1, the scalability information SEI message indicates that the following constraint is obeyed for all access units sets that can be derived from the target access unit set by invoking the sub-bitstream extraction process as specified in clause G.8.8.1 with tIdTarget equal to any value in the range of 0 to 7, inclusive, dIdTarget equal to any value in the range of 0 to 7, inclusive, and qIdTarget equal to any value in the range of 0 to 15, inclusive, as the inputs: The values of the samples in the decoded pictures for each access unit auA with temporal_id equa to tIdA and all following access units in decoding order are independent of an access unit auB with temporal_ equal to tIdB and tIdB less than or equal to tIdA, when there exists an access unit auC with temporal id equal to tIdC and tIdC less than tIdB, that follows the access unit auB and precedes the access unit auA in decoding order. Otherwise (temporal_id_nesting_flag is equal to 0), the scalability information SEI message indicates that the constraint specified for temporal_id_nesting_flag equal to 1 may or may not be obeyed. NOTE 4 - The syntax element temporal_id_nesting_flag is used to indicate that temporal up-switching, i.e., switching from decoding of up to a particular temporal_id value tIdN to decoding of up to a temporal_id value tIdM greater than tIdN, is always possible inside the target access unit set. priority_layer_info_present_flag equal to 1 specifies that characteristic information for priority layers, as specified later in this clause, is present in the scalability information SEI message and that priority layer information SEI messages associating an alternative value for priority_id with each layer representation of the primary coded pictures in the target access unit set are present. priority_layer_info_present_flage equal to 0 specifies that characteristic information for priority layers is not present in the scalability information SEI message. priority_id