The only change made to the copied field will be to namespace prefixes to ensure they are valid in the target document.
对复制的字段进行的惟一修改就是对名称空间前缀的修改，以确保它们在目标文档的有效性。
A final point about updating documents is that CouchDB has no concept of a portion of a document changing, only that the document did change.
关于更新文档需要指出的最后一点是：CouchDB没有文档部分更改的概念，只能指出文档的确发生了更改。
You can only change these by updating the document that contains the logical entity.
您只能通过更新包含逻辑实体的文档来更改这些实体。
You need to know how the Document Object Model (DOM) works only if you wish to change the code in this tutorial to suit your own applications.
只有当希望修改本教程中的代码以适应具体应用程序时才需要了解文档对象模型(DOM)的工作原理。
However, this will not be flexible as the only variable that you can change is the filename to indicate the document type and partner identifiers.
然而，这种方法不够灵活，因为您唯一可以更改的变量是指示文档类型和合作伙伴标识符的filename。
However, this will not be flexible as the only variable that you can change is the filename to indicate the document type and partner identifiers.
然而，这种方法不够灵活，因为您唯一可以更改的变量是指示文档类型和合作伙伴标识符的filename。
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