In version 7.x.y, x should change only when some documented user-visible aspect of Xconq changes, whether in the interface or kernel. In particular, any additions to GDL, such as a new table or property, require a new x version. y is reserved for bug-fix releases, which can include the implementation of features that were documented but not working correctly or completely.
The macro VERSION should also include a date in parentheses,
formatted in "military style", as in "8 Jul 1995". Be sure to set
the date to some approximation of the date of your most recent change to
the sources.