how to create an xml

Hello Everybody,
 
My J2EE web application has to read data from an Oracle database and generate an XML which should confirm to a given XSD file. I can create this XML file using java to retrieve data from DB and write it to an XML using File I/O. 
 
Is this the correct way to do it or should I be using some Free Utility code which will validate the XML file(against the given XSD) as it creates it?
 
I was thinking that since I will be writing Java code to create the XML it will anyways comply with specified XSD.
 
Thanks in advance.
 
Regards,
Anand



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