Merge two different XML document

Hi,

I have two XML document as listed below:

1)  (xmlDocA)

<GLogXMLElement>
<Location>
     <TransactionCode>NP</TransactionCode>
      <LocationGid>
         <Gid>
            <Xid>Rockville</Xid>
         </Gid>
      </LocationGid>
      <Address>
         <AddressLines>
            <SequenceNumber>2442</SequenceNumber>
            <AddressLine>1221 E Otem Circle</AddressLine>
         </AddressLines>
         <City>Miami</City>
         <ProvidenceCode>FL</ProvidenceCode>
         <PostalCode>91991</PostalCode>
      </Address>
</Location>
</GLogXMLElement>

2)     (xmlDocB)

        <Transmission>
        <TransmissionHeader>
                <UserName />
                <Password />
        </TransmissionHeader>
        <TransmissionBody>
        <!----- here goes GLogXMLElement XML element ---->
        </TransmissionBody>
   </Transmission>

I want to merge document 1) in to document 2) under <TransmissionBody> 
element. 

Is it possible?

When I try to do that I get org.jdom.IllegalAddException: The Content 
already has an existing parent

Code:

        SAXBuilder saxBuilder = new SAXBuilder();
        java.io.File xmlFile = new File("xmlDocA");
        org.jdom.Document xmlDocumentA = saxBuilder.build(xmlFile);

        xmlFile = new File("xmlDocB");
        org.jdom.Document xmlDocumentB = saxBuilder.build(xmlFile);

        Element rootA = xmlDocumentA.getRootElement();
        List childrenDocA = rootA.getChildren();
 
        Element rootB = xmlDocumentB.getRootElement();
        Element childDocB = rootB.getChild("TransmissionBody");
 
        childDocB.addContent(childrenDocA); ----------------- Exception at 
this line

        XMLOutputter xmlOutPutter = new 
XMLOutputter(Format.getPrettyFormat());
        xmlOutPutter.output(xmlDocumentB, System.out);

Thanks
Jasmin



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