public static MvcHtmlString ToHtmlString( RelationReference expression, bool link = true)
        {
            if (link)
                return MvcHtmlString.Create (string.Format("({1}) &isin; <a href=#association-{2}>{0}</a>",
                                                       expression.Relation.Identifier,
                                                       string.Join(", ", expression.ActualArguments),
                                                       expression.Relation.Identifier
                                                       ));

            return MvcHtmlString.Create (string.Format("({1}) &isin; {0}",
                                                       expression.Relation.Identifier,
                                                       string.Join(", ", expression.ActualArguments)
                                                       ));
        }
 private static string ToHtmlString(RelationReference expression)
 {
     return string.Format("({1}) &isin; {0}",
                          expression.Relation.Identifier,
                          string.Join(", ", expression.ActualArguments)
                          );
 }