Any user object can have collections of facts attached. The example shows a collection of two locations where this person can be found. By the way, the home address is not valid, because the state is missing in the address.

If the address had been in Europe, this address would have been printed, because isValid knows that most countries are small enough to do without states. How many of you [Europeans] did try to order things in America, but where unable to deliver the order because no state was filled in? Why is everyone implementing this smart behavior in its own CGI scripts (or is forgeting to implement it).