Node node = childNodes.item(i);
            if (node instanceof Element) {
                Element childElement = (Element) node;
                if (childElement.getTagName().equals(childName)) {
                    matches.add(childElement);
                }
            }
        }
        return matches;
    }

    protected Element getChild(Element element, String childName) {

    }

    public void appendChild(Node node) {
        boolean inPara = false;
        if (node instanceof Element) {
            Element element = (Element) node;
            if (element.getTagName().equals("para") && stack.getFirst().getTagName().equals("para")) {
                pop();
                inPara = true;
            }
        }
        stack.getFirst().appendChild(node);
        if (inPara) {

        for (int i = 0; i < otherContent.getLength(); i++) {
            Node child = otherContent.item(i);
            if (child instanceof Element && !((Element) child).getTagName().equals("section")) {
                parent.appendChild(document.importNode(child, true));
            }
        }
    }

    public static void appendElement(final Element element, final StringBuilder buf) {
        assertArgumentNotNull("element", element);
        assertArgumentNotNull("buf", buf);

        final String tag = element.getTagName();
        buf.append('<');
        buf.append(tag);
        appendAttrs(element.getAttributes(), buf);
        buf.append('>');
        appendChildren(element.getChildNodes(), buf);
        buf.append("</");