Case C-108/10: Judgment of the Court (Grand Chamber) of 6 September 2011 (reference for a preliminary ruling from the Tribunale di Venezia — Italy) — Ivana Scattolon v Ministero dell’Istruzione, dell’Università e della Ricerca (Social policy — Directive 77/187/EEC — Maintenance of the rights of workers in the event of a transfer of an undertaking — Meaning of undertaking and transfer — Transferor and transferee governed by public law — Application, from the date of transfer, of the collective agreement in force with the transferee — Salary treatment — Whether length of service completed with the transferor to be taken into account)