Many thanks to everyone who commented on the previous edition of Some Notes on Metadata Interchange. I'm in New Orleans for the Internet2 Fall Member Meeting this week, and as I expect to be discussing this area with a number of the other people attending I think this seems like a good time to publish a revision. This edition goes into more detail in some areas, as well as improving sections which needed clarification.
I continue to welcome comments and discussion. The next edition might be a couple of weeks away, but will likely go into more detail on what I think an aggregation appliance might need to include.