Convert Scopes to a controlled vocabulary

[mconlon17]

What term needs to be improved? (to add terms, please use Feature Request)

LANG_0000006

What needs to be improved? (annotations, subsumption, class expressions, other)

The registration authority for ISO-639-3 provides "scopes" for each language. Scopes indicate whether the language is a "macro language," an individual language, or a special language. Scopes appear to be single-valued in the data. The values should be from a controlled vocabulary, not open text.

Suggested improvement

Make a controlled vocabulary for the values and convert LANG_0000006 to have a range from the vocabulary