import java.util.List;

public class ModelBuilderSupport {
    protected List<Element> children(Element element, String childName) {
        List<Element> matches = new ArrayList<Element>();
        NodeList childNodes = element.getChildNodes();
        for (int i = 0; i < childNodes.getLength(); i++) {
            Node node = childNodes.item(i);
            if (node instanceof Element) {
                Element childElement = (Element) node;

 * implement it:
 *
 * <pre>{@code
 * // won't work
 * TreeTraverser<NodeType> traverser = node -> node.getChildNodes();
 * }</pre>
 *
 * Instead, you can pass a lambda expression to the {@code using} factory method:
 *
 * <pre>{@code
 * TreeTraverser<NodeType> traverser = TreeTraverser.using(node -> node.getChildNodes());
 * }</pre>
 *
 * @author Louis Wasserman
 * @since 15.0

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

            public void visitType(String name) {
                linkElement.appendChild(addType(name, listener));
            }
        });

        linkElement.normalize();
        if (linkElement.getChildNodes().getLength() == 1 && linkElement.getFirstChild() instanceof Element) {
            return linkElement.getFirstChild();
        }
        return linkElement;
    }

        return buf.toString().trim();
    }

    protected void parseTextContent(final Node node, final StringBuilder buf) {
        if (node.hasChildNodes()) {
            final NodeList nodeList = node.getChildNodes();
            for (int i = 0; i < nodeList.getLength(); i++) {
                final Node childNode = nodeList.item(i);
                parseTextContent(childNode, buf);
            }

            final NodeList snapshotNodeList = doc.getElementsByTagName("snapshot");
            if (snapshotNodeList.getLength() > 0) {
                final NodeList nodeList = snapshotNodeList.item(0).getChildNodes();
                for (int i = 0; i < nodeList.getLength(); i++) {
                    final Node node = nodeList.item(i);
                    if ("timestamp".equalsIgnoreCase(node.getNodeName())) {

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

    /**
     * {@link NodeList}の文字列表現を追加します。
     *
     * @param children