Combine several XML files with same structure

Question

Hello,
I have several XML files with the same structure and I want to combine them and create a new XML file to be bale to compare that information easily. It does not look very difficult but as I am very new in this I am not bale to get it
The structure of my actual files would be something simlar to:
Root->...-> Name->Address, Telephone
And what I would like to have si something like
Root->.... ->Address-> Name 1,Name 2....
Root -> ...->Telephone-> Name 1, Name 2....
Does anyone know how to do this.
Thanks

Answer 1

You could write a XSL transformation file that does this and transform your input file via
     * Transform XML file with a style sheet.
     * <p><b>Example:</b><p>
<table align="center" bgcolor="#E0E0E0" border=1 cellpadding="10" cellspacing="0"><tr><td><pre style="margin-top:0; margin-bottom:0">
XMLTransformer t = new XMLTransformer();
FileOutputStream fos = new FileOutputStream("C:/Project/result.html");
String xmlFile = "C:/Project/source.xml";
String styleSheet = "C:/Project/stylesheet.xsl";
t.transform(xmlFile, styleSheet, fos);
</pre></td></tr></table>
     * @param xmlfile The XML file to transform.
     * @param style Stylesheet to use for transformation.
     * @param outputStream OutputStream to write the transformed result to.
    public void transform(String xmlfile, String style, OutputStream outputStream) {
        DocumentBuilderFactory factory =  DocumentBuilderFactory.newInstance();
        //factory.setNamespaceAware(true);
        //factory.setValidating(true);
            //todo: use inputstreams instead of file names
            try {
                File stylesheet = new File(style);
                File datafile   = new File(xmlfile);
                DocumentBuilder builder = factory.newDocumentBuilder();
                document = builder.parse(datafile);
                // Use a Transformer for output
            TransformerFactory tFactory = TransformerFactory.newInstance();
            StreamSource stylesource = new StreamSource(stylesheet);
            Transformer transformer = tFactory.newTransformer(stylesource);
            DOMSource source = new DOMSource(document);
            StreamResult sr = new StreamResult(outputStream);
            transformer.transform(source, sr);
        } catch (TransformerConfigurationException tce) {
           // Error generated by the parser
           System.out.println ("\n**XMLTransformerr Factory error");
           System.out.println("   " + tce.getMessage() );
           // Use the contained exception, if any
           Throwable x = tce;
           if (tce.getException() != null) {
               x = tce.getException();
           x.printStackTrace();
        } catch (TransformerException te) {
           // Error generated by the parser
           System.out.println ("\n** Transformation error");
           System.out.println("   " + te.getMessage() );
           // Use the contained exception, if any
           Throwable x = te;
           if (te.getException() != null) {
               x = te.getException();
           x.printStackTrace();
         } catch (SAXException sxe) {
           // Error generated by this application
           // (or a parser-initialization error)
           Exception  x = sxe;
           if (sxe.getException() != null) {
               x = sxe.getException();
           x.printStackTrace();
        } catch (ParserConfigurationException pce) {
            // Parser with specified options can't be built
            pce.printStackTrace();
        } catch (IOException ioe) {
           // I/O error
           ioe.printStackTrace();
    }//transform()