这种产品类型层次结构使用元数据结构进行定义，并具有一组相关数据库表和业务服务。
This product type hierarchy is defined in a metadata structure and has an associated set of database tables and business services.
要表示现成的产品类型层次结构的现有产品表，可以使用附加的元素进行扩展。
The existing product tables representing the product type hierarchy provided out the box can be extended with additional elements.
未被声明为硬类型的产品类型可以声明为软类型，并且没有相关的数据库表和服务来管理特定于这些类型的元素。
Product types that are not declared as hard types can be declared as soft types, and there will be no associated database table and services for managing elements specific to those types.
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