private Renderer readRenderer(Element rendererElement) {
        Renderer renderer =new Renderer(rendererElement.getAttribute("name"));
        renderer.setRendererFor(nullIfEmpty(rendererElement.getAttribute("for")));
        renderer.parameters().putAll(readParameters(rendererElement));
        return renderer;
    }
Returns the page element corresponding to the given node, never null
container-search/src/main/java/com/yahoo/search/pagetemplates/config/PageTemplateXMLReader.java