Writing a Procedure to return back XML. Please help.

Question

Hello,
I am writing a procedure in Oracle 10G,that will return back an XML
to me.
I am passing 2 parameters to this procedure (a Quantity and a Price) and these parameters are element values of the XML that will be returned.
My Query is :
1) How can the arguments being passed to the procedure become element values.
2) Is my procedure to return back the XML correct.? Please can someone modify this procedure?
Please can someone help me with this procedure as this is a PROD issue.
Help really appreciated.
PROCEDURE getTradeXML(qty IN VARCHAR2,price IN VARCHAR2 xml IN OUT CLOB)
IS
xml CLOB;
BEGIN
xml  = 'SELECT XMLELEMENT("Trade", XMLELEMENT("Quantity",qty),
                                    XMLELEMENT("Price", price))
          FROM DUAL'
END;

Answer 1

PROCEDURE getTradeXML(qty IN VARCHAR2,price IN
VARCHAR2 xml IN OUT CLOB)
IS
xml CLOB;
BEGIN
xml  = 'SELECT XMLELEMENT("Trade",
XMLELEMENT("Quantity",qty),
MLELEMENT("Price", price))
FROM DUAL'maybe you want
SELECT XMLELEMENT("Trade", XMLELEMENT("Quantity",qty), XMLELEMENT("Price", price)) into xml FROM DUAL;
/*not tested*/