Ummmm... you're presenting the CONCEPT of metadara registries as if they exist & are in active use. In the 1970s & 1980s the industry term for this sort of work would have been under the umbrella of "data dictionary." With IBM's late 1980s AD/Cycle effort, "data dictionary" morphed to "metadata repository."
While many organizations have made concerted efforts to implement the dream of an "enterprise data dictionary/metadata repository" exceedingly few have succeeded.
So I think it a tad misleading to discuss "metadata registry" as if it were real (meaning in actual used by systems analysts, developers & operations). DEddy 03:19, 8 August 2006 (UTC)
I agree with the above, from what I have observed. Propose this context be added to the page (I'll probably do it next time I'm by).