*/
    public static void appendNode(final Node node, final StringBuilder buf) {
        assertArgumentNotNull("node", node);
        assertArgumentNotNull("buf", buf);

        switch (node.getNodeType()) {
        case Node.ELEMENT_NODE:
            appendElement((Element) node, buf);
            break;
        case Node.TEXT_NODE:
            appendText((Text) node, buf);
            break;

            return null;
        }

        @Override
        public void setNodeValue(String nodeValue) {
            this.nodeValue = nodeValue;
        }

        @Override
        public short getNodeType() {
            return 0;
        }
    }

    private static class MockNamedNodeMap implements NamedNodeMap {
        private final Map<String, Node> items = new HashMap<>();