Web服务操作Account . create需要一个新的强制性参数country，因此我们对Address类型进行修改，以添加这个新字段。

The Web service operation Account.create needs a new mandatory parameter for country, so we modify the Address type to add this new field.

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服务器可以限制发送给旧客户端字段的类型。

Your server can restrict the type of a field sent to an older client.

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在某些情况下(如显示从服务器返回的数据时)，字段可能具有值，尽管该字段为未设置字段(当不设置某些类型的字段时，SDO将为其分配缺省值)。

In some cases, such as when displaying data that has come back from the server, a field might have a value even though it is unset (SDO assigns a default value for some types when they are unset).

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