MetaKit has its own Wiki [L1 ] and home page [L2 ]. MetaKit is the persistence engine for WiKit, of course.
Mark Roseman has written a tutorial [L3 ] on MetaKit for Tcl developers. Here's the same tutorial [L4 ] in HTML.
DGP For what it's worth, here are the points I found most useful in the Roseman intro:
"... many of the integrity checks required in traditional database use are not required in Metakit, because Metakit offers nested views -- a cleaner way to represent the relationships often enforced by integrity constraints."
"cleaner" is a matter of opinion, ask a relational database theorist. I don't want to start those arguments here, just point out that if you use Metakit for a complex system, you should design first, and be very careful. - EMJ