private boolean simpleRenderHit(XMLWriter writer, Hit hit) {
        if (hit instanceof DefaultErrorHit) {
            return simpleRenderDefaultErrorHit(writer, (DefaultErrorHit) hit);
        } else if (hit instanceof GroupingListHit) {
            return true;
        } else {
            return false;
        }
    }
Writes a hit's default attributes like 'type', 'source', 'relevance'.
container-search/src/main/java/com/yahoo/search/pagetemplates/result/PageTemplatesXmlRenderer.java