4GL Design Resources?

Dracos asks: "Some friends and I are developing a tabletop fantasy RPG. The concept for our magic rules is based on a fourth generation language ^[?] , combined with an object model. I've spent the last few days searching the net, but all I've found is information on how to design data structures for use with 4GLs, not 4GLs themselves. The related alt.lang.* newsgroups appear to be dead.Does anyone know of any resources on how to design a 4GL? Information of our game, as well as the rules, can be found at http://www.thedragonsforge.com."