# File lib/kwartz/binding/jstl.rb, line 283
    def _handle_jstl_tag(tagname, param_list, options, ignore_unknown_option=false)
      options.each do |name, value|
        next if name.is_a?(String)
        options[name.to_s] = options.delete(name)
      end
      option_names = options.keys
      unless ignore_unknown_option
        unkown_option_names = option_names - param_list
        unless unkown_option_names.empty?
          msg = "'#{unkown_option_names[0]}': unknown option for '#{tagname}' directive."
          raise convert_error(msg, nil)   # TODO
        end
      end
      sb = "<c:#{tagname}"
      (param_list & option_names).each do |name|
        value = options[name]
        if value.is_a?(Symbol)
          sb << " #{name}=\"${#{value}}\""
        else
          sb << " #{name}=\"#{value}\""
        end
      end
      sb << ">"
      stag = sb
      etag = "</c:#{tagname}>"
      return stag, etag
    end