returns the minimum ttl for records in the zone if the record has a higher ttl , that value should be used as the ttl . concode_field_sep String responsiblePerson concode_elem_sep int expireTime concode_elem_sep long minimumTtl concode_elem_sep long serial concode_elem_sep int refreshTime concode_elem_sep String primaryNameServer concode_elem_sep int retryTime concode_field_sep String responsiblePerson concode_elem_sep int expireTime concode_elem_sep long serial concode_elem_sep int refreshTime concode_elem_sep String primaryNameServer concode_elem_sep int retryTime
long function ( ) { return minimumTtl ; }