One of the fundamental principles of Sistema Tavolare is the publicity connected with the other main principle of public faith.
What is registred in LR Books is real and produces its effects also towards third parties. This is the so called positive function of public faith.
The negative function of public faith: what is not registered it is not opposable to third parties.
The answers to this chapter can be found in Fact Sheet , Land Registry Publicuty: how to get the information.