As a database user, I would like the ability to attach metadata to a collection so that I can store free-text notes on its usage or lineage.  I have several large collections that I use for reference data, I would like to be able to attach tags, or KV pairs to the collection so that I can remind myself of important usage information.

{
  "name" : "Meteorite Landings",
  "downloadedFrom" :  "https://data.nasa.gov/Space-Science/Meteorite-Landings/gh4g-9sfh",
  "notes" : ["field 'mass' is in grams", "field 'recclass' should be a string"]
}