67. An encoder for encoding of syntactic elements of a data stream for carrying out the method of encoding of the syntactic elements of the data stream according to claim 35 , comprising: an entropy coder, an input data buffer, a binarized data buffer, a context model group selector, a context model group repository, a context model group processor, context element formers, a model update module, and a context mixing module.
67. An encoder for encoding of syntactic elements of a data stream for carrying out the method of encoding of the syntactic elements of the data stream according to claim 35 , comprising: an entropy coder, an input data buffer, a binarized data buffer, a context model group selector, a context model group repository, a context model group processor, context element formers, a model update module, and a context mixing module. 68. The encoder according to claim 67 , further comprising a binarizer for binarization of nonbinary syntactic elements.