When describing and representing domain-specific systems, there is frequently a need for a string type that can only assume a limited set of allowed values, a set, however, that is allowed to change over time (as values are added or removed) or space (different servers accepting different sets of strings). This need is addressed by this package.
A reference implementation of the controlled vocabularies was developed at European Bioinformatics Institute as an open source project candy.
The controlled vocabulary package consists of