The price is inexpensive, each specification has, welcome under order form.
价格廉价，各个规格都有，欢迎来下订单。
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。
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