38. The computer readable medium encoded with the electronic document of claim 34 , wherein: the reference includes one or more out-of-band values not defined in an encoding standard.
38. The computer readable medium encoded with the electronic document of claim 34 , wherein: the reference includes one or more out-of-band values not defined in an encoding standard. 39. The memory of claim 38 , wherein: the one or more out-of-band values identify one or more target attributes; and the reference identifies a glyphlet from a collection of glyphlets based on the one or more target attributes.