relation.rb was a project I started to experiment in the space of mapping
pure relational theory (with SQL as a backend) into Ruby.  This directory
include some code and a number of examples of what I was trying to achieve.

I've put the project on hold, planning to instead integrate the same
functionality into Ryan Pavlik's Criteria[1].  Please do not use relation.rb
for any production purpose - it is written as a proof of concept, and put out
only for discussion purposes.

[1] Criteria can be found from
	http://raa.ruby-lang.org/list.rhtml?name=criteria