DuroDBMS 0.20 released

DuroDBMS 0.20 (beta) has been released, with several fixes and enhancements, including support for system keys and transition constraints.

DuroDBMS 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 0.20 from: http://sourceforge.net/projects/duro/files/duro/0.20/