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I am dealing with an already created Document object. I have to be able to set it's base namespace (attribute name "xmlns") to certain value. My input is DOM and is something like: <root>...some content...</root> What I need is DOM which is something like: <root xmlns="myNamespace">...some content...</root> That's it. Easy, isn't it? Wrong! Not with DOM! I have tried the following: 1) Using doc.getDocumentElement().setAttribute("xmlns","myNamespace") I get a document with empty xmlns (it works on any other attribute name!) <root xmlns="">...</root> 2) Using renameNode(...) First clone the document: Document input = /*that external Document whose namespace I want to alter*/; DocumentBuilderFactory BUILDER_FACTORY_NS = DocumentBuilderFactory.newInstance(); BUILDER_FACTORY_NS.setNamespaceAware(true); Document output = BUILDER_NS.newDocument(); output.appendChild(output.importNode(input.getDocumentElement(), true)); I'm really missing document.clone(), but perhaps it's just me. Now rename the root node : output.renameNode(output.getDocumentElement(),"myNamespace", output.getDocumentElement().getTagName()); Now isn't that straightforward? ;) What I get now is: <root xmlns="myNamespace"> <someElement xmlns=""/> <someOtherElement xmlns=""/> </root> So (as all of us have expected, right?) , this renames the namespace only of the the root node . Curse you, DOM! Is there any way to do this recursively (without writing an own recursive method)? Please help ;) Please don't adv

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