Finding metadata in Schema?

[Gretchen Greene]

Schema'rs

In doing mapping of the RM metadata to the associated VOResource schema,
I'm looking for a few items in the schema that were standard in the RM
doc.
Can anybody point me to the schema containing...

Coverage depth
Coverage object density
Coverage object count
Coverage sky fraction

Maybe I missed these but anyway I've looked and do not seem to find
these in an obvious place.  We have some of these terms in our registry,
not tied to VOResource and so I'm trying to get these in place.

Also,  another missing item is the Coverage/spectral/central wavelength.
Min and max I see in the WavelengthRange.

-Gretchen