Data binding question (ObjectDataProvider attributes)

In working with the Feb CTP Hands-On Labs, I notice that I can set the ObjectDataProvider attributes to anything and the application still functions. When and how are these attributes used

<ObjectDataProvider x:Key="ContactListDataProvider" MethodName="AddressBook.ContactList,AddressBook"/>

I can changes these to anything and the binding still works:

<ObjectDataProvider x:Key="Whatever" MethodName="AddressBook.WhoCares,AddressBook"/>