The article analyzed the shortage of P_schema, and brought forward an improved method P_schema++.Nesting structure.multi_citing element, alternative element was picked up to format a new type, and then to a relation table. P_Schema++provided a method for storage of Complex XML document in RDB.% 分析了P_Schema的不足,并在此基础上提出了改进算法P_Schema++。将P_Schema没有提取完全的嵌套结构、被不同父元素重复引用的元素和可选元素提取出来形成新类型,从而映射为关系。为复杂XML文档的关系数据库存储提供了
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