ence parameter set NAL unit with the same value of parameter_set_ was present in the bitstream). When a subset sequence parameter set NAL unit with a particular value of seq_parameter_set_id is received, its content replaces the content of the previous subset sequence parameter set NAL unit, in decoding order, with the same value of seq parameter_set_ic (when a previous subset sequence parameter set NAL unit with the same value of seq_parameter_set_id was present in the bitstream). NOTE 7 - A decoder must be capable of simultaneously storing the contents of the sequence parameter sets and subset sequence parameter sets for all values of seq_parameter_set_id The content of the sequence parameter set with a particular value of seq_parameter_set_i is overwritten when a new sequence parameter set NAL unit with the same value of seq parameter_set_id is received, and the content of the subset sequence parameter set with a particular value of is overwritten when a new subset sequence parameter set NAL unit with the same value of seq_parameter_set_id is received When present, a sequence parameter set extension RBSP includes parameters having a similar function to those of a sequence parameter set RBSP. For purposes of establishing constraints on the syntax elements of the sequence parameter set extension RBSP and for purposes of determining activation of a sequence parameter set extension RBSP, the sequence parameter set extension RBSP shall be considered part of the preceding sequence parameter set RBSP with the same value of seq_parameter_set_id. When a sequence parameter set RBSP is present that is not followed by a sequence parameter set extension RBSP with the same value of _parameter_set_id prior to the activation of the sequence parameter set RBSP, the sequence parameter set extension RBSP and its syntax elements shall be considered not present for the active SVC sequence parameter set RBSP. The contents of sequence parameter set extension RBSPs only apply when the base layer, which conforms to one or more of the 