For each security role, a corresponding principal class and its name must be declared.
对于每个安全角色，必须声明相应的主体类及其名称。
A principal is a unique entity such as the name of an individual or group, an account number, a social security number, or similar unique identifier.
principal是一个惟一的实体，比如个人或者组的名字、帐号、社会安全号或者类似的惟一标识。
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