Each specification has its own section that includes the requirements related to the conformance targets relevant to that specification (such as MESSAGE, ENVELOPE, DESCRIPTION, and so on).
每个规范都有自己对应的部分，其中包括与该规范相关的一致性目标(如MESSAGE、ENVELOPE、DESCRIPTION等)。
A hierarchy has also a primary specification defining the common set of attributes for each category in the hierarchy tree.
层次结构也有一个主规格，它定义这个层次结构树中所有目录共有的属性。
Primary specification: Each catalog has a primary specification representing the set of Shared attributes for all products in the catalog.
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。
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