X 是标准枚举和扩展名之间的界限。
The x is the delineator between standard enumerations and extensions.
有了前面章节中提到过的严重性枚举，在与工作项信息相同的数据集中拥有状态组和状态名信息就更加方便了。
As with the severity enumeration described in the previous section, it would be more convenient to have the state group and state name information in the same data set as the work item information.
只返回一个特定即插即用枚举设备，使用枚举器参数提供的GUID或枚举符号名。
To return devices only for a specific PnP enumerator, use the enumerator parameter to supply the GUID or symbolic name of the enumerator.
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