Hi, I think I understand your question better now.
Do you mean I just need to send #noteOldKeys: with the lexical term as an argument?
No.
I thought this message should be used with the object from the Magma collection using the lexical terms as an index.
yes, it should be used with the whole object that is a member in the MagmaCollection. Unfortunately, I don't know of any easy way other than you must find a way to #noteOldKeysFor: the-object-which-is-*indexed-by*-the-lexical term.
These lexical terms design a classification, existing independently
I hope there are at least one thousand different classification members for the index, otherwise you may end up with a lot of hash-collisions in the Magma index, reducing performance..
Regards, Chris