On the off-chance anyone's looking for a way to visualize some of the combined effect of three different reports that cover some of the same territory--Delsey (2006), PCC's Provider-Neutral Guide (2012) and the BIBFRAME report (2012)--here is one attempt of showing that:

http://catalogingafricana.files.wordpress.com/2012/11/ndmso_pcc20122.pdf

I've skipped over a few pieces, and I've stopped short of showing relationships between different entities, in order to highlight the linkages from each entity to corresponding parts of the data structure we're used to.  MARC is the list of tags running down the middle, put here in light gray as they may be replaced with other content models and serializations.  BIBFRAME as the wrapper or abstraction layer bookends the FRBR entities, rather than merely being a replacement for MARC as such.

WEMI should be familiar; I don't know if I've shown the relationship between it and Work-Instance correctly...the 'A' for authorities groups together Group 2 and 3 of FRBR entities, and a fourth group 'A' for annotations may be applied to any part of the record structure.

At the cost of a bit of overload, I think it also gives some sense of the relative complexity at work between different entities and the parts of the traditional record structure that each references.  Maybe there's a better way to illustrate this dynamically, to help decide between content models for a particular use case, but this is as far as I could take it.

Charles