Research On Distributed Database Query Technology Base On XML

This paper was written with the goal of creating a complete picture of the XML's place in the today's distributed database applications. It also identifies the related research problems.The reasons for conceiving XML were presented at the beginning of the paper, as was its broad applicability. Terms like: standard for data exchange, separation of presentation and data, tool for defining new languages etc. were associated with XML.Then, the approaches and the implications of database XML-ization were considered. XML enabled databases and native XML databases were treated separately and in more detail. It was shown that it is still not clear what kind of XML database will prevail in the battle for XML management. For now, when making an engineering decision on selecting between those two types of XML databases, one must consider application requirements. Two large groups of applications, data-centric and document-centric were mentioned. It was concluded that there is no unique globally satisfying XML database solution.Finally, focus was switched to distributed database systems dealing with XML. Classification was presented in the paper to slice up and consider separately the introduction of XML to different parts of distributed database architecture. Major approaches and challenges to efficient distributed XML query execution were also discussed.