#10 Keep the order of the values of an attribute

[Aurélien Bénel]

The different values of an attribute shouldn't be sorted, since its order can have a meaning (e.g. for the authors of a paper).
http://ucadao.hypertopic.org/item?url=http%3A%2F%2Fargos.hypertopic.org%2Fentity%2FUCAD%2FZacklad_M3%2F