[jdom-interest] exception appending Element to Node

[felix]

In the next code, this error appears 
"org.w3c.dom.DOMException: DOM005 Wrong document":


......
Node nodeChild=nl.item(0);
DOMParser dp=new DOMParser();
dp.parse(new InputSource(new StringReader("<"+sNameElement+">"+"</"+sNameElement+">")));
Element root=dp.getDocument().getDocumentElement();
root.setAttribute("Order",sOrderElement);
root.setNodeValue(sValueElement);
nodeChild.appendChild(root);
....

I don't know where is the problem, any help would be appreciate

Regards
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