Feature: Information about active use of vocabulary

[guitarster]

It would be nice to have a field, where we could place Information aboute the active use of the vocabulary in libraries.
The field could be named "in active use in" and "aktiv angewendet von".

[nichtich]

This requires some modeling how to express "use of vocabulary". Some ideas:

• use in specific catalogs (e.g. DDC, RVK, BK is used in K10plus)
• use by specific organization (e.g. DDC, RVK, BK is used by GBV)
• plain text of use case
• plain URL of use case

The use could further be qualified by extent, date etc.