The two aspects of the standard requirements: First, the delivery of documents and letters of credit must be fully consistent with the requirements of the so-called "document consistent with";
这一标准有两方面的要求：一是交付的单据必须与信用证的要求完全相符，即所谓的“单证相符”；
The data in these documents may be about customers, employees, products, purchase orders, delivery reports, billing information, or other business objects that are part of a business logic.
这些文档中的数据可能是关于客户、雇员、产品、订购单、交货报告、付费信息或者其他是业务逻辑的一部分的业务对象的。
Cluster replication occurs when there are any database changes written to disk, such as the creation of new documents, delivery of new mail messages, and so on.
当向数据库写入任何更改时就会导致集群复制，比如创建新的文档和发送新的邮件消息等。
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