How can i write a XML file with oracle data ?

How can i write a XML file using PL/SQL.
Can i do as follows.
1.Open a file using UTL_FILE.FOPEN(LC_DIR_LOC,'abc.xml','W') ;
2.write all the required tag and value using UTL.put_line
that is enough. Is not, please guide me to write.
gk

Having Oracle 9i.
One more doubt. In the speck, some constand values are there, When i write the same into file, How can i write ?.
1. l_str := ' "E27" '
or
2. l_str := ' E27 '
UTL_FILE.PUT_LINE(L_FILE_POI,l_str,TRUE);
1 case : in XML file : "E27"
In 2 case : E27
When we write a XML file through editors , we have to define the constant within quote . is it?
Which one can i use ? Or any other way is there ..
Thanks and Regards
gopi

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