th payloadType equal to 0 or 1 included in a scalable nesting SEI message with identical values ofsei_temporal_id,sei_dependency_id[i and sei_quality_id[ i ] are used as the buffering period and picture timing SEI messages for checking the bitstream conformance according to Annex C, the bitstream that would be obtained by invoking the bitstream extraction process as specified in clause G.8.8.1 with tIdTarget equal to sei_temporal_id, dIdTarget equal to sei_dependency_id[i] and qIdTarget equal to sei_quality_id[ shall be conforming to this Recommendation | International Standard. In the semantics of clauses D.2.1 and D.2.2, the syntax elements num_units_in_tick, time_scale, fixed_frame_rate_flag, nal_hrd_parameters_present_flag, vcl_hrd_parameters_present_flag, low_delay_hrd_flag, and pic_struct_present_flag and the derived variables NalHrdBpresentFlag, VclHrdBpPresentFlag, and CpbDpbDelaysPresentFlag are substituted with the syntax elements vui_ext_num_units_in_tick[i], vui_ext_time_scale[i], vui_ext_fixed_frame_rate_flag[i kt_nal_hrd_parameters_present_flag[: i], vui_ext_vcl_hrd_parameters_present_flag[i vui_ext_low_delay_hrd_flag[i] and vui_ext_pic_struct_present_flag[ and the derived variables VuiExtNalHrdBpPresentFlag[ i], VuiExtVclHrdBpPresentFlag[ and VuiExtCpbDpbDelaysPresentFlag[ i]. The value of seq_parameter_set_id in a buffering period SEI message included in a scalable nesting SEI message with the values of sei_dependency_id[i] and sei_quality_id[i] shall be equal to the value of seq_parameter_set_id in the picture parameter set that is referenced by the layer representation with DQId equal to (( sei_dependency_id[i]< sei_quality_id[i]) of the primary coded picture in the same access unit. Otherwise (payloadType is equal to 4 or 5), the corresponding SEI message semantics are not extended. For the semantics of SEI messages with payloadType in the range of 0 to 23, inclusive, which are specified in clause D.2, SVC sequence parameter set is substituted for sequence parameter set; the parameters of the p