Omitting the standalone attribute in xml declaration when using Java DOM + Transformer.

Question

Is there any way to tell the Transformer (when serializing an XML document using DOM), to omit the standalone attribute?

Preferably without using a hack, i.e. ommitting the whole XML declaration and then prepending it manually.

My current code:

Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.STANDALONE, "yes"); //Note nothing is changed

StreamResult result = new StreamResult(new StringWriter());
DOMSource source = new DOMSource(document);
transformer.transform(source, result);
 return result.getWriter().toString();

Current:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<someElement/>

Intended:

<?xml version="1.0" encoding="UTF-8">
<someElement/>

score 52 · Accepted Answer · answered Nov 05 '09 at 20:03

52

Figured it out..

Instead of changes to the transformer,

I add the following to the document object.

  document.setXmlStandalone(true);

answered Nov 05 '09 at 20:03

vicsz

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Why does that even work? According to the spec: https://www.w3.org/TR/2004/REC-xml-20040204/#sec-rmd "If there are external markup declarations but there is no standalone document declaration, the value "no" is assumed." This answer: https://stackoverflow.com/questions/5578645/what-does-the-standalone-directive-mean-in-xml also states that if standalone attribute is missing then "no" is assumed. Then how come document.setXmlStandalone(true); removes the attribute? – mdzh Jun 21 '17 at 13:58

score 3 · Answer 2 · edited Jul 27 '12 at 04:57

3

document.setXmlStandalone(true/false); is working OK.

edited Jul 27 '12 at 04:57

Anthony

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answered Jan 18 '12 at 02:21

JackBauer

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score 2 · Answer 3 · answered Oct 25 '18 at 16:51

2

You have to use a combination of:

doc.setXmlStandalone(true);

and

transformer.setOutputProperty(OutputKeys.STANDALONE, "yes"); // this is used to show the standalone tag

answered Oct 25 '18 at 16:51

Rod Lima

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Finally a valid answer! :D – Jdruwe Dec 04 '18 at 13:32
The goal is to hide the attribute, the above answer shows the attribute. – pkozuchowski Aug 11 '21 at 18:50
@pkozuchowski you're correct, but what I'm saying is that we need to set both options to get it working properly. – Rod Lima Aug 12 '21 at 13:35
This doesn't answer the question. How do you omit the standalone= attribute in the xml declaration? – richb Jun 25 '23 at 03:53

score 0 · Answer 4 · answered Nov 05 '09 at 20:04

0

Which Java version are you using and/or which XSLT transformer? With Sun Java 1.6.0_16, the standalone attribute is only set in the output document if you set the output property and the content is also correct.

answered Nov 05 '09 at 20:04

jarnbjo

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I get the same problem using the built-in Java 8 SE from Eclipse 4.5 (Mars). – GreenhouseVeg Feb 08 '17 at 12:59

Omitting the standalone attribute in xml declaration when using Java DOM + Transformer.

4 Answers4