protected function renderDataTableMap($table, $array, $prefixLines = "")
    {
        // CASE 1
        //array
        //  'day1' => string '14' (length=2)
        //  'day2' => string '6' (length=1)
        $firstTable = current($array);
        if (!is_array($firstTable)) {
            $xml = '';
            $nameDescriptionAttribute = $table->getKeyName();
            foreach ($array as $valueAttribute => $value) {
                if (empty($value)) {
                    $xml .= $prefixLines . "\t<result $nameDescriptionAttribute=\"$valueAttribute\" />\n";
                } elseif ($value instanceof Map) {
                    $out = $this->renderTable($value, true);
                    //TODO somehow this code is not tested, cover this case
                    $xml .= "\t<result $nameDescriptionAttribute=\"$valueAttribute\">\n$out</result>\n";
                } else {
                    $xml .= $prefixLines . "\t<result $nameDescriptionAttribute=\"$valueAttribute\">" . self::formatValueXml($value) . "</result>\n";
                }
            }
            return $xml;
        }

        $subTables = $table->getDataTables();
        $firstTable = current($subTables);

        // CASE 2
        //array
        //  'day1' =>
        //    array
        //      'nb_uniq_visitors' => string '18'
        //      'nb_visits' => string '101'
        //  'day2' =>
        //    array
        //      'nb_uniq_visitors' => string '28'
        //      'nb_visits' => string '11'
        if ($firstTable instanceof Simple) {
            $xml = '';
            $nameDescriptionAttribute = $table->getKeyName();
            foreach ($array as $valueAttribute => $dataTableSimple) {
                if (count($dataTableSimple) == 0) {
                    $xml .= $prefixLines . "\t<result $nameDescriptionAttribute=\"$valueAttribute\" />\n";
                } else {
                    if (is_array($dataTableSimple)) {
                        $dataTableSimple = "\n" . $this->renderDataTableSimple($dataTableSimple, $prefixLines . "\t") . $prefixLines . "\t";
                    }
                    $xml .= $prefixLines . "\t<result $nameDescriptionAttribute=\"$valueAttribute\">" . $dataTableSimple . "</result>\n";
                }
            }
            return $xml;
        }

        // CASE 3
        //array
        //  'day1' =>
        //    array
        //      0 =>
        //        array
        //          'label' => string 'phpmyvisites'
        //          'nb_uniq_visitors' => int 11
        //          'nb_visits' => int 13
        //      1 =>
        //        array
        //          'label' => string 'phpmyvisits'
        //          'nb_uniq_visitors' => int 2
        //          'nb_visits' => int 2
        //  'day2' =>
        //    array
        //      0 =>
        //        array
        //          'label' => string 'piwik'
        //          'nb_uniq_visitors' => int 121
        //          'nb_visits' => int 130
        //      1 =>
        //        array
        //          'label' => string 'piwik bis'
        //          'nb_uniq_visitors' => int 20
        //          'nb_visits' => int 120
        if ($firstTable instanceof DataTable) {
            $xml = '';
            $nameDescriptionAttribute = $table->getKeyName();
            foreach ($array as $keyName => $arrayForSingleDate) {
                $dataTableOut = $this->renderDataTable($arrayForSingleDate, $prefixLines . "\t");
                if (empty($dataTableOut)) {
                    $xml .= $prefixLines . "\t<result $nameDescriptionAttribute=\"$keyName\" />\n";
                } else {
                    $xml .= $prefixLines . "\t<result $nameDescriptionAttribute=\"$keyName\">\n";
                    $xml .= $dataTableOut;
                    $xml .= $prefixLines . "\t</result>\n";
                }
            }
            return $xml;
        }

        if ($firstTable instanceof Map) {
            $xml = '';
            $tables = $table->getDataTables();
            $nameDescriptionAttribute = $table->getKeyName();
            foreach ($tables as $valueAttribute => $tableInArray) {
                $out = $this->renderTable($tableInArray, true, $prefixLines . "\t");
                $xml .= $prefixLines . "\t<result $nameDescriptionAttribute=\"$valueAttribute\">\n" . $out . $prefixLines . "\t</result>\n";
            }
            return $xml;
        }

        return '';
    }