enum primitives_t { _eos =  0x00, _boolean =  0x01, _integer =  0x02, 
                    _bitstring =  0x03, _octetstring =  0x04, _null =  0x05, 
                    _oid =  0x06, _odesc =  0x07, _external =  0x08, 
                    _real =  0x09, _enum =  0x0A, _sequence =  0x10, 
                    _set =  0x11, _numericstring =  0x12, 
                    _printablestring =  0x13, _t61string =  0x14, 
                    _videotextstring =  0x15, _ia5string =  0x16, 
                    _utctime =  0x17, _generalizedtime =  0x18, 
                    _graphicstring =  0x19, _iso646string =  0x1A, 
                    _generalstring =  0x1B, _utf8string =  0x1C, 
                    _mask =  0x1F };