This is a very useful feature if resources are shuffled and test cases need to be reassigned to new owners midstream.
如果资源被搅乱或者测试用例需要被指派到新的所有者的话，这将是一个非常有用的特性。
Sometimes this can be a disadvantage, while in other situations this is a very useful feature.
在有些情况下这可能是个缺点，而在有些情况下则是非常有用的功能。
This feature has proven very useful in leaving extension points in schemas.
该特性已被证实对于在模式中留下扩展点非常有用。
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