把业务逻辑嵌入文档的能力使企业能够在文档级控制安全性。
The ability to embed business logic into documents empowers enterprises to control security at the document level.
除非嵌入文档和被嵌入文档使用相同的编码——这一点很难保证，否则就会出错。
Unless the embedding and embedded documents use the same encoding, which is almost impossible to guarantee, it won't work. See Listing 1 for an example of this error.
嵌入的文档就像类里的成员对象。
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