setDocument(DocumentHelper.createDocument(getNamespaceURI(), getQualifiedName(localName), null));
this.document = _document;
    public NamespaceHelper(String _namespaceUri, String _prefix, String localName)        throws ParserConfigurationException {        this.namespaceUri = _namespaceUri;        this.prefix = _prefix;        setDocument(DocumentHelper.createDocument(getNamespaceURI(), getQualifiedName(localName),                null));    }