code: protected RawData __render(String template, Object... args) {
          if (null == template) return new RawData("");
          return S.raw(__engine.sandbox().render(template, args));
      }
docs: Render another template from this template. Could be used in template authoring.
  For example:
  <p/>
  <pre><code>
  {@literal @}args String customTemplate, Map<String, Object> customParams
  {@literal @}{ Object renderResult = render(customTemplate, customParams);
  }
  <p class="customer_content">@renderResult</p>
  </code></pre>
  
  @param template
  @param args
  @return render result