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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例如，清单12显示了一个数据实例，在此数据实例中顶级的同构元素集由三个item元素组成。

For example, Listing 12 shows a data instance in which a top-level homogeneous set of elements consists of the three item elements.

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当数据以不同级别通过嵌套方式包含同构数据集时，XForms 将尽显其功能的强大。

The power of XForms really shows itself when you have data that contains homogeneous data sets at different levels, with one nested within the other.

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