Excerpt from Cassandra's service description in Thrift

gistfile1.txt

struct Column {
   1: required binary name,
   2: optional binary value,
   3: optional i64 timestamp,
   4: optional i32 ttl,
}

...

service Cassandra {

    ...
    ColumnOrSuperColumn get(1:required binary key,
            2:required ColumnPath column_path,
            3:required ConsistencyLevel consistency_level=ConsistencyLevel.ONE)
    throws (1:InvalidRequestException ire, 2:NotFoundException nfe, 3:UnavailableException ue, 4:TimedOutException te),
    ...