Clients can extend our product with additional entities and attributes, and the mechanism is backward-compatible with our clients' existing code.
客户机可以用更多的实体和属性扩展我们的产品，并且该机制与客户机已有代码是向后兼容的。
Changes to message formats can be made so that they are backward compatible, that is, so that existing code does not have to be updated.
可以对消息格式进行更改，使它们具有向后兼容性，这样就无需更新现有的代码。
Changes to message formats can be made so that they are backward compatible, that is, so that existing code does not have to be updated.
可以对消息格式进行更改，使它们具有向后兼容性，这样就无需更新现有的代码。
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