the use of "database" in the docs references an "in memory only" database, right?  The whole set of facts and rules must be parsed or otherwise "entered/programmed" into memory.  There's no automatic disk backing, like a BTree or relational database persisting stuff behind the scenes? Thanks. <div class="gmail_quote">On Fri, Feb 13, 2009 at 6:08 PM, Jay McCarthy <<a href="mailto:jay.mccarthy@gmail.com">jay.mccarthy@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> I've just released a PLaneT package that adds Datalog as a language in DrScheme. It is called datalog.plt. <a href="http://planet.plt-scheme.org/display.ss?package=datalog.plt&owner=jaymccarthy" target="_blank">http://planet.plt-scheme.org/display.ss?package=datalog.plt&owner=jaymccarthy</a> Documentation is available online. <a href="http://planet.plt-scheme.org/package-source/jaymccarthy/datalog.plt/1/0/planet-docs/datalog/index.html" target="_blank">http://planet.plt-scheme.org/package-source/jaymccarthy/datalog.plt/1/0/planet-docs/datalog/index.html</a> In particular, check out the tutorial! <a href="http://planet.plt-scheme.org/package-source/jaymccarthy/datalog.plt/1/0/planet-docs/datalog/Tutorial.html" target="_blank">http://planet.plt-scheme.org/package-source/jaymccarthy/datalog.plt/1/0/planet-docs/datalog/Tutorial.html</a> Jay -- Jay McCarthy <<a href="mailto:jay@cs.byu.edu">jay@cs.byu.edu</a>> Assistant Professor / Brigham Young University <a href="http://teammccarthy.org/jay" target="_blank">http://teammccarthy.org/jay</a> "The glory of God is Intelligence" - D&C 93 _________________________________________________  For list-related administrative tasks:  <a href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme" target="_blank">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</a> </blockquote></div>