The Study Of XML Document Storage Technique In Relation Database System

As a standard of express and exchanging of data on Internet,eXtensible MarkupLanguage becomes more and more popular,But,with the published XML data on the netis increasing, it is a difficult problem how manage these XML documents.Atpresent,There are some emphasis researches that store XML documents with relationaldatabase. But because of the great difference between XML data and relational data instructure, as well as some difficult problems such as multi-value elementmapping,recursive element mapping and mix-content element mapping are not resolvedeffectively. So storing XML document in relation databasebecomes a hotspot in thestudy of XML storage strategy.In this paper, Author focus on the research of XML document stored in relationdatabase, analyse the basic semantic information of XML Schema, Firstly, bringforward a storage method of XML document based on I_Schema( Improved XMLSchema). It is created by XML Schema, is a equivalent expression of XMLSchema ;Secondly, Author put forward the classified node which can be directlymapped into relation,Ancestor is a table that store nesting filiation of classifiednode ;Then, Author bring forward a set of rewritting rules of the I_Schema, use searchalgorithm to find a I_Schema whose cost is minimum in the I_Schema ; Lastly,experiment proving I_Schema method is better than other methods such as TEXT andXparent on information maintaining, data querying and updating during XML datastorage.In conclusion, Enunciation of theories analysis and experiment contrast, Storagemethod of XML document based on I_Schema is valid in this paper.