public List<ModelElement> subElements(String name) {
        List<Element> elements = XML.getChildren(xml, name);

        List<ModelElement> helpers = new ArrayList<>();
        for (Element e : elements)
            helpers.add(new ModelElement(e));
        return helpers;
    }
Returns the content of the attribute with the given name or throws IllegalArgumentException if not present
config-model/src/main/java/com/yahoo/vespa/model/builder/xml/dom/ModelElement.java