Using:
XmlOptions.setSaveSuggestedPrefixes()
XmlOptions xmlOptions = new XmlOptions();
xmlOptions.setSavePrettyPrint();
xmlOptions.setSavePrettyPrintIndent(4);
xmlOptions.setSaveAggressiveNamespaces();
HashMap<String, String> nsMap = new HashMap<String, String>();
nsMap.put("namespace1","A");
nsMap.put("http://www.w3.org/2001/XMLSchema-instance", "xsi");
xmlOptions.setSaveSuggestedPrefixes(nsMap);
<Your XmlObject>.save(new File("test.xml"),xmlOptions);
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