虽然快照和克隆等主题并未在此处演示，但是参考资料部分提供了有关此主题的有趣的文章的链接。
Topics such as snapshots and clones were not demonstrated here, but the Resources section provides links a interesting articles on this topic.
不管是一个足够提供可见性和可追溯性的简单链接，还是一个有自己独特特征且链接回原型的克隆，都是必需的。
Either a simple link, providing visibility and traceability is enough, or a clone that has its own unique identity and is linked back to the original is needed.
是否能通过简单链接处理一个既定状况，或者，是否需要克隆。
Whether a given situation can be handled by simple links, or whether it requires cloning, in both cases a standardized, tool neutral way of linking artifacts across modeling domains is required.
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