XPath Querying Technology Research Based Structure Index Of XML Data Stream

With the wide application of Internet, structure index and preprocessing technology to resolve XPath query processing with predicates. In theory the structure index and preprocessing can improve the execution efficiency of the XPath with predicates. experiment results show that the algorithm can effectively improve the XPath queries with predicates.XML data stream the structure index and preprocessing can improve the execution efficiency of the XPath with predicates. processing system is running on the Internet. The users are massive in this environment. They use XPath expression to describe their queries needs. How to process a large number of XPath queries on the XML data stream is an urgent problem need to be resolved in the application of data stream.we get the small structure index according to XML document Schema, the execution efficiency of the XPath with predicates structural navigation part of XPath queries,second,we process predicate when XML data stream is flowing.This paper adopts structure index and preprocessing technology to resolve XPath query processing with predicates. In theory the structure index and preprocessing can improve the execution efficiency of the XPath with predicates. experiment results show that the algorithm can effectively improve the XPath queries with predicates.