A FEMtuple is basically a vector of emcCalFEM, and as such is quite easy to implement directly in user code (currently it's only used in the calibrator, a class which will also soon be revisited anyway...). Thus the following documentation might not be really accurate.
The Object Filler scheme was developped at the time of the "multi-pass" dataproduction (PRDF to DST, DST to microDST, microDST to nanoDST). It never was fully finalized before we switched to Fun4All, and as such might be considered as deprecated, even though I could imagine some use cases for it, still.
Collect a manageable from the DB. See the DM interface for parameters. Unless allowed explicitely by a particular Object Manager, in general the returned pointer (should not be deleted) by the receiver !
Has been deprecated because handling of collections is better done elsewhere. That's not the job of the datamanager, after all...