protected Element getChild(Element element, String childName) {
        Element child = findChild(element, childName);
        if (child != null) {
            return child;
        }
        throw new RuntimeException(String.format("No <%s> element found in <%s>", childName, element.getTagName()));
    }

    protected Element findChild(Element element, String childName) {
        NodeList childNodes = element.getChildNodes();

        List<Element> valueTitles = new ArrayList<Element>();
        for (int i = 1; i < header.size(); i++) {
            Element element = header.get(i);
            Element override = findChild(element, "overrides");
            if (override != null) {
                element.removeChild(override);
                inheritedValueTitleMapping.put(override.getTextContent(), element);
            }