active node lookup table 活动结点对照表
A lookup node is then created and initialized which also has the name service entry.
然后创建并初始化一个查找节点，它也有名称服务条目。
This node can lookup a collection of named column values from a located database row.
该节点可以从特定的数据库行查找指定列值的集合。
This node is added to the beginning of the lookup list and a reference to this node is returned as the import context.
把这个节点添加到查找列表的开头，作为导入上下文返回节点的引用。
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