1. Use case Multiversioning Modifications of the hcontainer Heading of the title 3  new heading Title 3  Title 7 at t2

2. Modification of the heading titolo 3 titolo 3 new title articolo 15.... articolo 16.... articolo 17.... The id is modified in the previous version The article is identical in the previous version

3. Modification of the number titolo 3 titolo 7 articolo 15.... articolo 16.... articolo 17.... IDRef to TemporalGroup

4. It is possible also the opposite for not modifying the previous version (e.g. digital signature). It depends to the scenario titolo 3 articolo 15.... articolo 16.... articolo 17.... titolo 3 new title

5. Proposal to attributes

6. TemporalData and TemporalGroup