decoder: Decode Coded Variables to Plain Text (and Vice Versa)
Main function "decode" is used to decode coded key values to plain text. Function "code"" can be used to code plain text to code if there is a 1:1 relation between the two. The concept relies on "keyvalue" objects used for translation. There are several "keyvalue"" objects included in the areas of geographical regional codes, administrative health care unit codes, diagnosis codes et cetera but it is also easy to extend the use by arbitrary code sets.