HERICHER Benoit DSIC BUA wrote: Hi, This is not possible. Classes in XWiki can have fields only of predefined, simple data types. Usually, the strategy to do what you want is like this: 1. Create the Address class, also adding an "address type" field. 2. In a document, use one Contact object and several Address objects. This way you gain even more flexibility. You can either use one Address object with "type" = "personal" and one with "type" = "work" (or whatever values you like), or you can accept any number of objects, and the user can select what type of address he wants, and a button "add address" allows him to add a new Address object. -- Sergiu Dumitriu http://purl.org/net/sergiu/