Therefore, this method records the full path expression of every type of XML node, and preserves the relationship between them through a special numbering, which is described by prefix and sequence number. 该方法依据XML的数据模型,采用前缀加序号的方式对XML文档的各类节点加以编码,达到保留节点关系的作用,同时记录各节点的完整路径表达式。