Saving format

[Alexandre Fen-Chong <fenxp free fr>]

Hello,
sorry for my english I'm French :p
 
when I save a diagram with the format .shape 
the properties of the objects which aren't displayed on the diagram, aren't
saved in the file.

Are these properties saved somewhere ?

Or there is a format that allow to save also the properties not visible in the
file you save ?

Or there is another way to save these properties in a file that you save?