[Dbappbuilder-relannounce] ANNOUNCE: Rel version 1.0.8 Beta released

[Rel a. list. <dba...@li...>]

This version of Rel -- an implementation of Date & Darwen's "Tutorial D" 
database language -- is a maintenance release featuring one enhancement 
and two bug fixes:

1. Enhancement: Rel: Error reporting has been improved when Java-based
    built-in operators fail.  E.g., SUBSTRING("blah", 1, 20) used to fail
    in an un-helpful manner. Now, the error message goes some way toward
    explaining and locating the problem.

2. Fix: Rel: The following failed with a low-level error; now fixed:

     var items private relation { id  integer, name  character } init (
      relation {
       tuple {id 1, name "hi"},
       tuple {id 2, name "lo"},
       tuple {id 3, name "do"}}) key {id};
     var result private relation {r relation same_heading_as(items)} key 
{r};
     var inner private relation same_heading_as(items) key {id};
     insert inner relation {tuple from items where id = 1};
     insert result relation {tuple {r inner}};

3. Fix: Rel: Updating a relation-valued attribute, as in the following...

     var x private relation {a integer, b relation {c integer}}
          init (relation {tuple {a 1, b relation {tuple {c 2}}}})
          key {a};
     update x where a = 1 (b := update (b) (c := 33));

    ...caused an error like the following:
    "ERROR: '%tuple23' has not been defined."
    This has been corrected.

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