code: def getParameters(self, postalAddress):
          
          address = u''
          if postalAddress is not None:
              address = postalAddress.address
          return [
              liveform.Parameter('address', liveform.TEXT_INPUT,
                                 unicode, 'Postal Address', default=address)]
docs: Return a C{list} of one L{LiveForm} parameter for editing a
          L{PostalAddress}.
  
          @type postalAddress: L{PostalAddress} or C{NoneType}
  
          @param postalAddress: If not C{None}, an existing contact item from
              which to get the postal address default value.
  
          @rtype: C{list}
          @return: The parameters necessary for specifying a postal address.