数据库可以为每个节点分配顺序号，这样就知道每个节点的位置，可以在常数时间内比较两个节点的文档顺序。
The database can assign sequence Numbers to each node so that it knows the position of each node and can compare the document order of two nodes in constant time.
因此，该插件自动从数据库中检索一组示例XML文档实例(见图5，序号2)。
Therefore, the plugin automatically retrieves a set of sample XML document instances from the database (see Figure 5, Number 2).
该实用程序利用底层DB 2数据库生成序号。
This utility will take advantage of underlying DB2 database to generate the sequence Numbers.
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