> 1) what is its application? I guess I found part of my "laymans" answer: http://www.cs.toronto.edu/~yaron/Presentations/pods2003.ppt#468,39,Example
> 2) how is it used? Maybe this question should have been, what is the syntax? Regards, Richard Broersma Jr. ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly