43. The computer readable medium encoded with the computer program of claim 42 , wherein: the string includes a plurality of references comprising one or more in-band values defined in an encoding standard.
43. The computer readable medium encoded with the computer program of claim 42 , wherein: the string includes a plurality of references comprising one or more in-band values defined in an encoding standard. 44. The computer readable medium encoded with the computer program of claim 43 , wherein: parsing the string to identify a reference includes interpreting a plurality of in-band values to define the identified reference.