关于贸易品分类的问题，是否有按照加工分类的？

如题。
HS和SITC这些都是按照产品种类分类的。
有没有按照加工方式分类的呢？比如原材料，初级产品，高级产品这类的？就是按照加工程度的不同。
有没有这类的定义或者分类方法呢？

The Broad Economic Categories (BEC) is a three-digit classification, which groups transportable goods according their main end use. It is most often used for the general economic analysis of international merchandise trade data. The BEC system is defined in terms of the Standard International Trade Classification system.
The original BEC was published in 1971, and revised in 1976, 1986 and most recently in 1988. The top level categories of the BEC are as follows:
BEC-1: Food and beverages
BEC-2: Industrial supplies not elsewhere specified
BEC-3: Fuels and lubricants
BEC-4: Capital goods (except transport equipment), and parts and accessories thereof
BEC-5: Transport equipment and parts and accessories thereof
BEC-6: Consumer goods not elsewhere specified
BEC-7: Goods not elsewhere specified
In 2007 a fourth revision is under discussion, including a possible extension of the BEC to include tradable services.