Meaning of "language" names

[Dar Scott]

Several places in Revolution as in font names, htmlText, uniDecode(),  
and uniEncode() the word "language" is used to designate the  
character encoding.  The value for language is not the name of some  
standard, it seems, but is some other name, often the name of a  
natural language.  Presumably there is some map from the Revolution  
names to the character encoding standard.

Is that arbitrary, or based on some Internet standard such as an IANA  
standard or the MIME standard, or based on some Font standard?  How  
do I get from the Revolution names for character encodings to the  
standards?

Does the "language" in this context ever indicate anything other than  
character encoding to Revolution?

Dar