-fields from which we can fish out values using the "extract" expansion
-function. To use this feature, we must put the string into the $value variable,
-i.e. set lookup_value. */
-
-lookup_value = rdata;
-s = expand_string(US"${extract{data}{$value}}");
-if (*s != 0) addr_prop.address_data = string_copy(s);