DBAppBuilder: Rel version 0.3.13 released

This version of Rel -- an implementation of Date & Darwen's "Tutorial D" database language -- includes several fixes and enhancements:

First, the fixes:

• In some cases, an expression that used the result of one WHERE operator as input to another WHERE operator would generate bogus results or throw an exception. This has been corrected.

• JOINing relations with relation-valued attributes could cause an exception. This has been corrected.

• If a database update resulted in a database constraint violation, it would display bogus tuple update notices and/or carry erroneous tuple update counts to subsequent updates. This has been corrected.

The following enhancements have been made:

• When using DBrowser in un-enhanced mode, literal CHARACTER values are now output with delimiters. This is done to be consistent with the view that un-enhanced output can be fed to the input and parsed.

• A character LENGTH operator has been added to
  the OperatorsChar.d script.

• When using DBrowser in enhanced mode, literal
  CHARACTER values are displayed without delimiters.

• Error messages have been made more readable.
  Extraneous token names have been removed and
  un-terminated character strings no longer
  generate an error message with confusing
  internal debugging information.

For more information, or to download Rel, see
http://dbappbuilder.sourceforge.net/Rel.html