XML DATA PROCESSING SYSTEM, DATA PROCESSING METHOD AND XML DATA PROCESSING CONTROL PROGRAM USED FOR THE SYSTEM

XML analyzer 11 analyzes and decomposes XML data ina into nodes and assigns node identifiers to the nodes to produce XML data inb while creating indexes ix for specifying node identifiers for XML data inb on the basis of XPath expression F. Storage 12 stores XML data inb while index storage 13 stores indexes ix. XPath expression processor 14 uses indexes ix to acquire the node identifiers corresponding to XPath expression F while acquiring XML data inc corresponding to the node identifiers from stored XML data inb.