http://raa.ruby-lang.org/list.rhtml?name=btpgsql BtPgsql is a module containing classes which are able to emulate a bi-temporal database in conjunction with PostgreSQL. http://eli.fsl.noaa.gov/lib/ruby/btpgsql/btpgsql-0.0.0/doc/ for more info http://eli.fsl.noaa.gov/lib/ruby/btpgsql/ to download. feel free to contact me directly with any questions or comments. -ara ==================================== | Ara Howard | NOAA Forecast Systems Laboratory | Information and Technology Services | Data Systems Group | R/FST 325 Broadway | Boulder, CO 80305-3328 | Email: ahoward / fsl.noaa.gov | Phone: 303-497-7238 | Fax: 303-497-7259 ====================================