bio_db_repo_version(-Version)
 bio_db_repo_version(-Version, -Date)
Version is a YY:MM:DD term with integer components corresponding to publication date (Year = YY, Month = MM, Day = DD).

Until 2018, the 2 argument predicate was the main entry point (as the date and version didnot match- but the latter was derived off the date).
As of 2018 bio_db_repo_version/1 is the main entry point and bio_db_repo_version/2 is provided for compatibility with other stoics.org.uk packs.

Currently:

?- bio_db_repo_version(V,D).
V = 26:6:18,
D = date(2026, 6, 18).

Previously:

   30bio_db_repo_version(26:6:18).
   31bio_db_repo_version(26:6:18, date(2026, 6, 18))