Abstract: XML,as a semi-structured language,is widely used in converting unstructured information to structured information because of its special characteristic of pre-defined mark.In this work,the complicated unstructured data on the network was converted to XML semi-structured data through POI technology,then the semi-structured data was converted to structured data by parsing XML file through SAX,which would provide convenience for users to search for information.In addition,those efficiencies of parsing of XML files though methods of SAX and DOM were compared in this work for the first time.It demonstrates that the parsing efficiency of SAX is higher than DOM when they are used to parse the same file,and this gap will increase with the size of XML file.

Key words: Big data,Unstructured data,Extensible markup language,Document resolution technology