注意，在注册过程中如果用户名已存在，您可以创建一个包含各种提交用户名组合数据（构成提示用户名）的 XML 结构。
Notice that now when a user name already exists during registration, you create an XML structure that includes various combinations of user-submitted data that make up suggested user names.
您的用户名不存在。
如果响应包含用户数据，则它表示特定用户名称的用户已经存在。
If the response contains the user data, it indicates a user with the given user name already exists.
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