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XE에서 지원하는 대부분의 트리거는 before와 after가 한 쌍으로 되어 있는데, 유독 문서 추천(document.updateVotedCount)과 댓글 추천(comment.updateVotedCount)는 after만 지원해서 서드파티 자료가 추천 전에 끼어들기가 쉽지 않습니다. after 트리거에서 에러를 반환하여 rollback을 유도함으로써 추천을 막는 방법이 있지만, 이것도 트랜잭션을 사용할 수 있는 DB type에서나 통하는 꼼수이고요.