[xwiki-users] Creating a class : hHow to add tye of properties?

Hi, I would like to create a class "Contact" with a property " PersonalAddress". As I guess that will have to reuse the concept of Address to manage other things , I decide to create first a class "Address" and then I would like to assign this type to the property "PersonalAddress" of the class "Contact" as one would do in OO Languages like Java ; but it doesn't seem possible or did I miss something? Thank you Benoît