Converting Document object into XML file

I was wondering how to convert a document object to XML file? I have read the documentation about document and Node but nothing explains the procedure of the conversion. Ive been told that it can be done, but not sure how. I have converted an XML file into Document by parsing DocumentBuilder. Just not sure how to do the reverse. Any help appreciated.

TransformerFactory tf = TransformerFactory.newInstance();
Transformer trans = tf.newTransformer();
trans.transform(new DOMSource(yourDOMsRootNode), new StreamResult(new FileOutputStream(yourFileName)));or something a lot like that.

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Converting Dom Document object into XML file removes the DTD

Hi All
My xml is dtd. I have one xml file. i changed the node value after that i want to create a xml file with the same name. I created new xml file but i am not seeing the old dtd in the new file. This process is done with the help of jaxp.
My code is given below
File fileInput = new File("input.xml");
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          TransformerFactory tFactory = TransformerFactory.newInstance();
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transformer.setOutputProperty(javax.xml.transform.OutputKeys.INDENT, "true");
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          DOMSource source = new DOMSource(document);
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          StreamResult result = new StreamResult(fos);
          transformer.transform(source, result);
Thanks in advance

The Transformer API does not guarantee the preservation of that information. You may want to check the DOM L3 Load/Save package (http://java.sun.com/javase/6/docs/api/index.html). Alternatively, you may force things by setting the additional output properties 'doctype-public' and 'doctype-system'.

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This not really a specific APEX question... but I search the database forum and found this thread which I think will help
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There are apparently a variety of Java/XML bindings. Try Google.
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The DocumentBuilder class does not allow you to parse a portion of the xmlfile. Therefore, it will not be possible to read "TestCase" into the DOM without bringing in "RealCase" nodes as well. As such, these codes will parse the entire xml file into DOM:
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document document = builder.parse( xmlFile );
However, your problem can be solved by reading only "TestCase" nodes in DOM, as follows:
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Once you have made your changes, save the DOM back to the XML file, using the serializer method as discussed earlier.
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Thank you Paul Clapham,
and sorry ..
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-- Vladimir

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Hi all
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Thanks in advance

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Is there a direct method for conversion of a Document object to xml file? My code is like this
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Converting Document object into XML file

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