文档处理程序类的大小和复杂性随着不同 XML 标签数量的增加而增加，直到某个时候可读性和维护性都变得非常差。
The size and complexity of the document handler class increases with the number of different XML tags, up to the point where readability and maintenance can become very difficult.
一个标签处理函数类。
为了提高XML数据查询处理效率，提出对XML数据结点采用标签聚类存储，同时结点路径信息存储在位向量中。
To improve XML data query, all nodes are clustered based their labels, and path information of each node is kept in bit vectors.
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