public function xmlrpc_param_description_html($paramdescription, $indentation = "") {
        $indentation = $indentation . "    ";
        $brakeline = <<<EOF


EOF;
        // description object is a list
        if ($paramdescription instanceof external_multiple_structure) {
            $return = $brakeline . $indentation . "Array ";
            $indentation = $indentation . "    ";
            $return .= $brakeline . $indentation . "(";
            $return .= $brakeline . $indentation . "[0] =>";
            $return .= $this->xmlrpc_param_description_html($paramdescription->content, $indentation);
            $return .= $brakeline . $indentation . ")";
            return $return;
        } else if ($paramdescription instanceof external_single_structure) {
            // description object is an object
            $singlestructuredesc = $brakeline . $indentation . "Array ";
            $keyindentation = $indentation . "    ";
            $singlestructuredesc .= $brakeline . $keyindentation . "(";
            foreach ($paramdescription->keys as $attributname => $attribut) {
                $singlestructuredesc .= $brakeline . $keyindentation . "[" . $attributname . "] =>" .
                        $this->xmlrpc_param_description_html(
                                $paramdescription->keys[$attributname], $keyindentation) .
                        $keyindentation;
            }
            $singlestructuredesc .= $brakeline . $keyindentation . ")";
            return $singlestructuredesc;
        } else {
            // description object is a primary type (string, integer)
            switch ($paramdescription->type) {
                case PARAM_BOOL: // 0 or 1 only for now
                case PARAM_INT:
                    $type = 'int';
                    break;
                case PARAM_FLOAT;
                    $type = 'double';
                    break;
                default:
                    $type = 'string';
            }
            return " " . $type;
        }
    }