mashup 解决方案的不同之处在于用户角色和用于创建独特价值的聚合的数据集。
The differences in the mashup solutions are the roles of the users and the data sets being aggregated to create unique value.
一个角色可以代表多个用户，但它也代表一个用户集可以执行的权限。
A role can represent multiple users, but it also represents the permissions that a set of users can perform.
默认角色和默认策略共同构成默认授权：多维数据集上针对没有显式访问规则的用户的隐式访问规则。
Together, the default role and default policy make up the default authorization: the implicit rule of access on the cube for users with no explicit rule of access.
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