Generating XML and Saving it to File and Reading a XML file into Database

Hello,I have requirements where i have to generate XML file from EBS and write it to a directory and there will be a XML file in a Directory that i also need to read in EBS Database. In simple words i have to READ and WRITE a XML file. 1- For Generating a XML FileI have googled these requirments and found a XMLDB to generate XML from SQL and to write it directory i have come to know there are two methods dbms_xslprocessor.clob2file and DBMS_XMLDOM.WRITETOFILE.Please guide me which one i should use?2- For