== Modèle de données ==
There are changes to the data model:
New date and language fields on place name
A Family Tree ''' cannot be opened''' in Gramps 3.4/4.0/4.1 and Gramps 4.2 without upgrade or downgrade.
A Gramps XML file generated by Gramps 3.4/4.0/4.1 is ''' not identical''' to one generated by Gramps 4.2.
* Gramps 4.2
is now '''python3''' only
See [[Database_Formats#Detailed_Changes|detailed changes]] for more details on internal database.