目录规格如有变更，恕不另行通知。
Specifications are subject to change without notice for further improvement.
主规格：每个目录有一个主规格，它代表这个目录中所有产品共有的属性。
Primary specification: Each catalog has a primary specification representing the set of Shared attributes for all products in the catalog.
通过使用目录和规格特性，可以非常灵活地对产品和产品层次结构进行建模。
With the catalog and specification features, you can model in a very flexible way the products and the hierarchies you need to group them.
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