이 enum('none', 'unk', 'incmpl', 'cmpl') 는 뭐야 도대체..
다음 링크를 따라가 본다.
- none - no CDS specified from the sequence's data source.
- unk - unknown - not known if CDS start/end is complete.
- incmpl - the CDS start/end is incomplete
- cmpl - the CDS start/end is complete.