private static Element writeTemplate(@NotNull PostfixTemplate template,
                                       @NotNull PostfixTemplateProvider provider,
                                       @Nullable String builtinId) {
    Element templateElement = new Element(TEMPLATE_TAG);
    templateElement.setAttribute(ID_ATTR_NAME, template.getId());
    templateElement.setAttribute(KEY_ATTR_NAME, template.getKey());
    templateElement.setAttribute(PROVIDER_ATTR_NAME, provider.getId());
    if (builtinId != null) {
      templateElement.setAttribute(BUILTIN_ATTR_NAME, builtinId);
    }
    provider.writeExternalTemplate(template, templateElement);
    return templateElement;
  }
private static Element writeTemplate(@NotNull PostfixTemplate template,
                                       @NotNull PostfixTemplateProvider provider,
                                       @Nullable String builtinId)