The paper raises opinions of using class and order number to collect books of different classes but of the same author in the same kind.
界定了属于同一种书用同一种次号的不同版本；提出了不同版本、版次、卷册次图书的标识方法；对不同版本的图书应分别进行著录。
A simple practical solution to this problem is to add a sequence number to our buffer class, and process the data in the buffer if the buffer sequence number is in order.
这个问题的一个实际解决办法是，为我们的内存类增加顺序号，并按照顺序号处理内存。
The class tag maps the order object to the ORDERS table and has a number of sub tags that describe its properties, the ID and the order name, and a one-to-many relationship to models.Item.
class标签把ORDER对象映射到ORDERS表，还有许多子标签用于描述其属性、ID订单名称，以及同models . Item的一对多关系。
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