Android : How to create ordered xml structure using Simple 2.7 android library?

I am trying to create xml data using [http://simple.sourceforge.net/][1] in my android app, but the response is not in the order which I want. Kindly help. Does anybody know about this? Can you point me to references that support one argument or the other?

@Root(name = "soapenv:Envelope")
@NamespaceList({@Namespace(reference = "http://schemas.xmlsoap.org/soap/envelope/", prefix = "soapenv")})

public class CreditTransactionEnvelope {

        @Element(name = "soapenv:Body")
        public CreditTransactionBody creditTransactionBody;

        public static class CreditTransactionBody {

            @Element(name = "v1:SendTranRequest")

            public CreditTransactionRequest creditTransactionRequest;

            @Root
            @NamespaceList({@Namespace(reference = "http://postilion/realtime/merchantframework/xsd/v1/", prefix = "v1")})
            public static class CreditTransactionRequest implements Serializable{
                private static final long serialVersionUID = -6866019353714061968L;

                @Element(required = true, name = "v1:merc")
                public Merchant merchant;

                @Element(name = "v1:tranCode", required = true)
                public int tranCode;

                @Element(required = true, name = "v1:card")
                public Card card;

                @Element(name = "v1:reqAmt", required = true)
                public int reqAmt;

public static class Merchant {


/* Make sure id of merchant must be 15 digit*/
@Element(name = "v1:id", required = true)
public String id;

/* Make sure regkey of merchant must be 16 digit*/
@Element(name = "v1:regKey", required = true)
public String regKey;

@Element(name = "v1:inType", required = true)
public int type;


/* Product Type: This is the product type for this
particular transaction.
Valid Values:  5 = Credit/Debit Card (Default)
*/

/* This Field is optional*/
@Element(name = "v1:prodType", required = false)
public String productType;

}

     public static class Card {

        @Element(name = "v1:pan", required = true)
        public String pan;

        @Element(name = "v1:xprDt", required = true)
        public String expiryDate;


        @Element(name = "v1:sec", required = false)
        public String sec;

        @Element(name = "v1:trk1", required = false)
        public String trk1;


        @Element(name = "v1:trk2", required = false)
        public String trk2;

    }
}
}

The output produced from above code is below, But i want merc tag at first. OutPut:

<v1:card>
<v1:pan>xxx</v1:pan>
<v1:xprDt>1601</v1:xprDt>
</v1:card>
<v1:merc>
<v1:id>xxx</v1:id>
<v1:regKey>xxx</v1:regKey>
<v1:inType>1</v1:inType>
</v1:merc>
<v1:tranCode>0</v1:tranCode>

<v1:reqAmt>1</v1:reqAmt>
</v1:SendTranRequest>
</soapenv:Body>
</soapenv:Envelope>



  [1]: http://simple.sourceforge.net/