[Haskell-cafe] Silly question: accessing a slot in a data type

Hi, I'm writing a very simple address book. I defined the follwoing types for Contact and AddressBook: type Name= String type PhoneNumber= Integer data Contact = Contact {name :: Name, phone:: PhoneNumber} deriving Show -- The addressBook is a lista of Contacts data AddressBook= AddressBook [Contact] deriving Show -- Create a test one ag = Agenda [Contact "BillG" 618965332, Contact "Linus" 5897458] I wan't to write a function to search for a given phone by name and return a Maybe PhoneNumber. I know how to do this recursively on a "raw" list, but how do I access the list inside AddressBook? Also, how do I represent an AddressBook with an empty list and one with data on its list for my pattern matching? Thanks!