Our versioning system for the database releases consists of a maximum of three digits e.g. 2.1.1
An increase in the first digit of the BIRD database release means that a new version of the database is available.
For instance, a new version may incorporate additional frameworks or major changes in the methodology.
An increase in the second or third digit of the BIRD database release means an add-on or bug-fix release respectively.
For instance, an add-on release may contain transformation rules whereas a bug-fix release may contain minor changes or technical error corrections.