DuroDBMS 1.2 released

DuroDBMS 1.2 has been released. This version is the first to provide subtyping, although limited insofar as only dummy types can be supertypes.
Also, this version provides more built-in operators, among other improvements.

DuroDBMS 1.2 is a truly relational database management system, based on the principles laid down in the book Databases, Types, and the Relational Model: The Third Manifesto by C. J. Date and Hugh Darwen. Download DuroDBMS from: http://sourceforge.net/projects/duro/files/duro/1.2/