根据特性，并行操作可以按任何顺序发生，因此，不存在那种对并行事务集合执行的限制。

By their nature, parallel operations can occur in any order, so there is no such restriction on the execution of the parallel transaction collection.

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还学习了如何用过滤器限制给定集合中的节点。

You also learned how to use filters to limit the nodes in a given set.

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限制集合的内容，要求在集合中的特定位置出现特定的主题类型或者角色。

To restrict the contents of the collection, requiring specific topic types or roles at specified positions within the collection.

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