private void renderParameters(Map<String,String> parameters, XMLWriter writer) {
        // Render content
        for (Map.Entry<String, String> parameter : parameters.entrySet())
            writer.openTag("parameter").attribute("name", parameter.getKey())
                                       .content(parameter.getValue(), false)
                  .closeTag();
    }
Writes a hit's default attributes like 'type', 'source', 'relevance'.
container-search/src/main/java/com/yahoo/search/pagetemplates/result/PageTemplatesXmlRenderer.java