产品类型层次结构是一个严格的树，而类别层次结构则是一个有方向的非循环图表。
A product type hierarchy is a strict tree, whereas a category hierarchy can be a directed acyclic graph.
如您所料，niem类型由一个类别图表中的类别表示。
As you might expect, NIEM types are represented by classes in a class diagram.
从组合图表下拉框“作为一个对象”中选择适当的动画对象，按序列，按序列中的元素或按类别中的元素，单击确定。
Choose the appropriate object from the Group chart drop-down control to animate the chart as a single object, by series, by category, or by.
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