简答题 4.信用证中有如下文件要求：“CERTIFICATE ISSUED BY VESSEL OWNER／CAPTAIN／CARRIER OR BY ANY OR HEIR．AGENTS STATING THAT THE CARRYING VESSEL IS SUBJECT TO THE INTERNATONAL SAFETY MANAGEMENT(ISM CODE)AND VESSEL IS CONFERENCE LINE VESSEL OR IS SAILING ON REGULAR LINER SERVICES AND／OR IS A MEMBER OF P&I CLUB．”
请分别说明上述各项要求是什么。以及要求证明上述各项的目的。[东北财经大学2011国际商务硕士]