TBD VocabularyTerm references
A single vocabulary term may link to other vocabulary terms in the same or different controlled vocabulary.
Example 1: The term
UKR in the ISO 3166 3-letter country code vocabulary is equivalent or sameAs
UA in the ISO 3166 2-letter country code vocabulary.
Example 2: The terms
120 in the "Biological status of accession" descriptor are memberOf
We need a
@ManyToMany between term A and term B, with the additional relation type (