CARRAY----- BinaryByteStream Fixed length
No Encode/Decode
STRING ------ CharBytesStream Variable length
Encode/Decode
VIEW --------- C Structure Oriented Fixed length
Encode/Decode
FML ---------- Attribtutes/Value Oriented Variable length
Encode/Decode
越往上边，越简单、效率高、类型少、死板
越往下边，越复杂、效率低、类型多、灵活