since this discussion gets a bit less agile in the last days, it is
perhaps a good point in time to reflect the outcome of this discussion
in the definition I proposed.
I think we identified the mayor problems in this preliminary definition.
The suggestion I give to avoids these problems essentially goes along
the lines, Jakob made some Emails earlier (12.4.):
"... A better definition might be: A collection is a digital object
which consists of a set or a list and is named by a PID (which when