def attribute_syntax(attribute)
      type   = attribute_type(attribute)
      syntax = nil
      until type.nil? || syntax = type.syntax
        type = attribute_type(type.sup)
      end
      syntax
    end
def attribute_syntax(attribute)
      type   = attribute_type(attribute)
      syntax = nil
      until type.nil? || syntax = type.syntax
        type = attribute_type(type.sup)
      end
      syntax
    end
Returns an Ldaptic::Schema::LdapSyntax object encapsulating server
 provided information about the syntax of an attribute.

    L.attribute_syntax(:cn).desc #=> "Directory String"