a property which indicates who added an item to a collection

[balmas]

feedback from P9

[balmas]

per discussion in 25-April Web Conference: request feedback from group participants. Add use cases here if it is needed.

[fbaumgardt]

Our group would have use for this property: we manage collaborative work on collections and need to be able to filter collections according to their contributors as well as partition collections according to contributors.

[balmas]

deferring