Creating xml documents dynamically based on a schema

[Tony Brown]

I have created a java form in Swing that has fields for user input. What I need to do is to get that user input into xml format that conforms to an xml schema I created.
Is it possible to do this with DOM? I saw a createDocumentType function that seems like it might be what I need. Does that sound right? Any help would be greatly appreciated.

[Lasse Koskela]

I would just write straight-forward Java code, which takes the input and writes the corresponding XML into a PrintWriter/StringWriter.

[Ketan KC Chachad]

Hi All,
Even I have a similar kind of doubt. I have been using classes from the com.docuverse.dom package for creating a DOM structure for a XML file. But whenever I am creating such a file I need to get the initial root element from an already existing XML file.
In other words I first parse an already existing XML template file using the DOMParser of org.apache.xercers.parsers package. From this I get the Document of the XML file and from there I get the Root Element to which I add the rest of the elements. Can I not create a Document and append elements to it from scratch and then write the whole structure to a file?
Can anyone provide me with any kind of tutorials / links / help that will help me do the same?

[Hari Vignesh Padmanaban]

As lasse mentioned, I tyhink the straigt forward way to do it is to write it using a fileoutputstream as follows !!!

try {        
        OutputStream fout= new FileOutputStream("fileName.xml");
        OutputStream bout= new BufferedOutputStream(fout);
        OutputStreamWriter out 
         = new OutputStreamWriter(bout, "8859_1");
      
        out.write("<?xml version=\"1.0\" ");
        out.write("encoding=\"ISO-8859-1\"?>\r\n");  
        out.write("<Elemnts>\r\n");  //root elemnt
        /* 
           Proces teh file and add teh elemnts here !!!
       */
        out.write("</Elemnts>\r\n");  
        out.flush();  
        out.close();
      }
      catch (UnsupportedEncodingException e) {
        System.out.println(
         "This VM does not support the Latin-1 character set."
        );
      }
      catch (IOException e) {
        System.out.println(e.getMessage());        
      }
  

DOM does provide an Interface called DOMImplementation that allows you to create a new Document based on a DTD. You can then add elemnts and attributes using the Document interface. I am not sure if tehre is one for schema .
The methods defined in teh interface are as follows

DOMImplementation
This is an abstract factory responsible for creating two things - new Document and Document type. It also has a hasFeature() method. The signatures are 
DocumentType createDocumentType(String rootElement, String publicID, string SystemID)
Document createDocument(String rootElementNamespaceURI, String rootelemntQName, DocumentType docType) 
boolean hasFeature(String feature, String version) 

An example of doing ot using this would be as follows

 
DocumentBuilderFactory factory 
       = DocumentBuilderFactory.newInstance();
      factory.setNamespaceAware(true);
      DocumentBuilder builder = factory.newDocumentBuilder();
      DOMImplementation impl = builder.getDOMImplementation();
      
      // Create the document
      DocumentType testDOCTYPE = impl.createDocumentType(
       "rootElemnt", "-//W3C//DTD TEST 1.0//EN", 
       "http://www.hari-vignesh.com/test.dtd"
      );
      Document doc = impl.createDocument(
       "http://www.hari-vignesh.com/test", "rootElemt", testDOCTYPE);
       
      // Fill the document
      Node rootElement = doc.getDocumentElement();
      Element child_1 = doc.createElementNS(
       "http://www.hari-vignesh.com/test", "childElemnt");
      child_1.setAttribute("attr1", "value");
      rootElement.appendChild(child_1);

Hope this helps
hari

[Ketan KC Chachad]

Thank you Hari Vignesh Padmanaban for the code. But can you provide me with some links for that will help me understanding the API more? Some kind of Tutorials of any kind. It will be a big help. Thanks in advance. This request goes to everyone who can help me