code: public void setXmlVersion(String version) {
  		if (version == null) {
  			remove(OutputKeys.VERSION);
  			return;
  		}
  
  		put(OutputKeys.VERSION, version);
  	}
docs: <p>
  Sets the XML version to use (defaults to "1.0").
  </p>
  <p>
  Note: Many JDKs only support 1.0 natively. For XML 1.1 support, add a
  JAXP library like <a href=
  "http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22xalan%22%20AND%20a%3A%22xalan%22"
  >xalan</a> to your project.
  </p>
  @param version the XML version or null to remove