docs: def createContactItem(self, person, address):
          """
          Create a new L{PostalAddress} associated with the given person based on
          the given postal address.
  
          @type person: L{Person}
          @param person: The person with whom to associate the new
              L{EmailAddress}.
  
          @type address: C{unicode}
          @param address: The value to use for the I{address} attribute of the
              newly created L{PostalAddress}.  If C{''}, no L{PostalAddress} will
              be created.
  
          @rtype: L{PostalAddress} or C{NoneType}
          """
          if address:
              return PostalAddress(
                  store=person.store, person=person, address=address)