LEAP has changed significantly since the previous
release (B0.8). The system has not only become far more
stable, but it is now more usable, and also can handle
infix expressions, such as those in C.J.Date,
S.Stanczyk, and B.Desai's books.

Revision History 
================

(B0.9 -> B0.9a)
---------------

* Minor documentation changes to reflect a change in contact
  details.

(B0.8 -> B0.9)
--------------

* Infix expressions are fully supported.
* The parser is more robust, and should no longer crash with
  malformed expressions.
* Context sensitive help is available on all operators within
  LEAP, and on key relational concepts. 
* The help file can be changed to suit users needs. eg. 
  Customised for teaching, changed for language.
* CTRL-C no longer crashes the program at a prompt.
* Screen is returned to 80x25 mode at the end and when NORMAL
  is entered. Earlier versions returned to the same mode as
  at startup, which did cause problems after a crash.
* Status information available.
* Timing information is available, and may be switched on/off within LEAP.
* US Time format is supported, and can be switched on/off within LEAP.
* Output copy file can be disabled if required.
* Debug information can be switched on/off within LEAP.
* Wildcards no longer valid in relation names when relation created.
* LEAP no longer crashes if one of the relation files is missing.
* Removed irratating ---> before source files when listed.

(A0.7 -> B0.8)
--------------

* Polite error message if important files not found.
* <> added to expressions.
* Nesting allows the DISPLAY command to print relations.
* Helpfile brought into line in a couple of places.
* "Christened" as LEAP, executable filename changed to tally.
* Documentation.

(A0.6 -> A0.7)
--------------

* Nesting of commands supported.
* Relations can be created within the program.
* Tuples can be added to relations within the program.
* No longer bombs out if unknown relation specified in an operator
* Screen size can be adjusted to EGA/VGA 43/50 lines.
* General tidyup of some output
* Memory leaks have been resolved.
* $TEMPDIR$\RARDBMS.TMP file created, mirroring output to screen
* Irratating "Press any key" removed.
* Debug information added to reporting.

(->0.6)
-------
Purely internal revisions. Version A0.6 was the first
version released onto the internet, and provided full
operators, but limited flexibility.

Known bugs
==========

* I've resolved all of the bugs people have let me know about... At least,
  I *think* I have... I know there are more... I'm all ears...

Wish List
=========

I hope to implement the following before too long...

* Indexing utilised throughout more operators
* An interactive query builder.
* Support for relational integrity
* Query optimisation
* The world...
