Demo type: command line
     Run: login as "oracle"
          cd /localb/oracle/app/oracle/product/8.1.5
          source  xmlsql/OracleXSU/unixenv.csh
      a) generate XML from table of database
          command format:
          java OracleXML getXML [-withDTD] [-user "scott/tiger"] \
            "select * from emp"
             for example:
          java OracleXML getXML -user "scott/tiger" "select * from emp"
      b) insert XML file into table of database
          command format:
          java OracleXML putXML [-user "scott/tiger"] XMLFile tableName 
             for example:
          java OracleXML putXML -user "scott/tiger" \
            -filename b.xml  roman-table       
     Comment: OracleXML are loaded into the database