所有其他非字符实体类型都被忽略，而且不进行检验，即使对于内部子集中的声明。

All other non-character entity types are ignored, and no validation is performed, even for declarations within the internal subset.

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在第一个实例中，字符串是一个直接的服务级别(例如GoldService)，在这种情况下它是已通过检验的、有效证书的CN。

In the first case, that string is an explicit service level, for example GoldService, and in this case it is the CN of a verified, valid certificate.

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distinct将检验节点集以查找拥有相同字符串值的节点，并且只保留每个节点的一个实例，而将其余都删除。

Set: distinct examines a node set for nodes with the same string value and removes all but one instance of each.

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