format.php

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            $qo->tolerance[] = $this->getpath( $answer, array('#','tolerance',0,'#'), 0 );

            // fraction as a tag is deprecated
            $fraction = $this->getpath( $answer, array('@','fraction'), 0 ) / 100;
            $qo->fraction[] = $this->getpath( $answer, array('#','fraction',0,'#'), $fraction ); // deprecated
        }

        // get units array
        $qo->unit = array();
        $units = $this->getpath( $question, array('#','units',0,'#','unit'), array() );
        if (!empty($units)) {
            $qo->multiplier = array();
            foreach ($units as $unit) {
                $qo->multiplier[] = $this->getpath( $unit, array('#','multiplier',0,'#'), 1 );
                $qo->unit[] = $this->getpath( $unit, array('#','unit_name',0,'#'), '', true );
            }
        }
        return $qo;
    }

    /**
     * import matching type question
     * @param array question question array from xml tree
     * @return object question object
     */
    function import_matching( $question ) {
        // get common parts
        $qo = $this->import_headers( $question );

        // header parts particular to matching
        $qo->qtype = MATCH;
        $qo->shuffleanswers = $this->getpath( $question, array( '#','shuffleanswers',0,'#' ), 1 );

        // get subquestions
        $subquestions = $question['#']['subquestion'];
        $qo->subquestions = array();
        $qo->subanswers = array();

        // run through subquestions
        foreach ($subquestions as $subquestion) {
            $qo->subquestions[] = $this->getpath( $subquestion, array('#','text',0,'#'), '', true );
            $qo->subanswers[] = $this->getpath( $subquestion, array('#','answer',0,'#','text',0,'#'), '', true);
        }
        return $qo;
    }

    /**
     * import  essay type question
     * @param array question question array from xml tree
     * @return object question object
     */
    function import_essay( $question ) {
        // get common parts
        $qo = $this->import_headers( $question );

        // header parts particular to essay
        $qo->qtype = ESSAY;

        // get feedback
        $qo->feedback = $this->getpath( $question, array('#','answer',0,'#','feedback',0,'#','text',0,'#'), '', true );       

        // get fraction - <fraction> tag is deprecated
        $qo->fraction = $this->getpath( $question, array('@','fraction'), 0 ) / 100;
        $q0->fraction = $this->getpath( $question, array('#','fraction',0,'#'), $qo->fraction );

        return $qo;
    }

    function import_calculated( $question ) {
    // import numerical question

        // get common parts
        $qo = $this->import_headers( $question );

        // header parts particular to numerical
        $qo->qtype = CALCULATED ;//CALCULATED;

        // get answers array
       // echo "<pre> question";print_r($question);echo "</pre>";
        $answers = $question['#']['answer'];
        $qo->answers = array();
        $qo->feedback = array();
        $qo->fraction = array();
        $qo->tolerance = array();
        $qo->tolerancetype = array();
        $qo->correctanswerformat = array();
        $qo->correctanswerlength = array();
        $qo->feedback = array();
        foreach ($answers as $answer) {
            // answer outside of <text> is deprecated
            if (!empty( $answer['#']['text'] )) {
                $answertext = $this->import_text( $answer['#']['text'] );
            }
            else {
                $answertext = trim($answer['#'][0]);
            }
            if ($answertext == '') {
                $qo->answers[] = '*';
            } else {
                $qo->answers[] = $answertext;
            }
            $qo->feedback[] = $this->import_text( $answer['#']['feedback'][0]['#']['text'] );
            $qo->tolerance[] = $answer['#']['tolerance'][0]['#'];
            // fraction as a tag is deprecated
            if (!empty($answer['#']['fraction'][0]['#'])) {
                $qo->fraction[] = $answer['#']['fraction'][0]['#'];
            }
            else {
                $qo->fraction[] = $answer['@']['fraction'] / 100;
            }
            $qo->tolerancetype[] = $answer['#']['tolerancetype'][0]['#'];
            $qo->correctanswerformat[] = $answer['#']['correctanswerformat'][0]['#'];
            $qo->correctanswerlength[] = $answer['#']['correctanswerlength'][0]['#'];
        }
        // get units array
        $qo->unit = array();
        if (isset($question['#']['units'][0]['#']['unit'])) {
            $units = $question['#']['units'][0]['#']['unit'];
            $qo->multiplier = array();
            foreach ($units as $unit) {
                $qo->multiplier[] = $unit['#']['multiplier'][0]['#'];
                $qo->unit[] = $unit['#']['unit_name'][0]['#'];
            }
        }
                $datasets = $question['#']['dataset_definitions'][0]['#']['dataset_definition'];
                $qo->dataset = array();
                $qo->datasetindex= 0 ;
        foreach ($datasets as $dataset) {
            $qo->datasetindex++;
            $qo->dataset[$qo->datasetindex] = new stdClass();
            $qo->dataset[$qo->datasetindex]->status = $this->import_text( $dataset['#']['status'][0]['#']['text']);
            $qo->dataset[$qo->datasetindex]->name = $this->import_text( $dataset['#']['name'][0]['#']['text']);
            $qo->dataset[$qo->datasetindex]->type =  $dataset['#']['type'][0]['#'];
            $qo->dataset[$qo->datasetindex]->distribution = $this->import_text( $dataset['#']['distribution'][0]['#']['text']);
            $qo->dataset[$qo->datasetindex]->max = $this->import_text( $dataset['#']['maximum'][0]['#']['text']);
            $qo->dataset[$qo->datasetindex]->min = $this->import_text( $dataset['#']['minimum'][0]['#']['text']);
            $qo->dataset[$qo->datasetindex]->length = $this->import_text( $dataset['#']['decimals'][0]['#']['text']);
            $qo->dataset[$qo->datasetindex]->distribution = $this->import_text( $dataset['#']['distribution'][0]['#']['text']);
            $qo->dataset[$qo->datasetindex]->itemcount = $dataset['#']['itemcount'][0]['#'];
            $qo->dataset[$qo->datasetindex]->datasetitem = array();
            $qo->dataset[$qo->datasetindex]->itemindex = 0;
            $qo->dataset[$qo->datasetindex]->number_of_items=$dataset['#']['number_of_items'][0]['#'];
            $datasetitems = $dataset['#']['dataset_items'][0]['#']['dataset_item'];
            foreach ($datasetitems as $datasetitem) {
                $qo->dataset[$qo->datasetindex]->itemindex++;
              $qo->dataset[$qo->datasetindex]->datasetitem[$qo->dataset[$qo->datasetindex]->itemindex] = new stdClass();
              $qo->dataset[$qo->datasetindex]->datasetitem[$qo->dataset[$qo->datasetindex]->itemindex]->itemnumber =  $datasetitem['#']['number'][0]['#']; //[0]['#']['number'][0]['#'] ; // [0]['numberitems'] ;//['#']['number'][0]['#'];// $datasetitems['#']['number'][0]['#'];
              $qo->dataset[$qo->datasetindex]->datasetitem[$qo->dataset[$qo->datasetindex]->itemindex]->value = $datasetitem['#']['value'][0]['#'] ;//$datasetitem['#']['value'][0]['#'];
          } 
        }
                
                // echo "<pre>loaded qo";print_r($qo);echo "</pre>";

        return $qo;
    }

    /**
     * this is not a real question type. It's a dummy type used
     * to specify the import category
     * format is:
     * <question type="category">
     *     <category>tom/dick/harry</category>
     * </question>
     */
    function import_category( $question ) {
        $qo = new stdClass;
        $qo->qtype = 'category';
        $qo->category = $this->import_text($question['#']['category'][0]['#']['text']);
        return $qo;
    }

    /**
     * parse the array of lines into an array of questions
     * this *could* burn memory - but it won't happen that much
     * so fingers crossed!
     * @param array lines array of lines from the input file
     * @return array (of objects) question objects
     */
    function readquestions($lines) {
        // we just need it as one big string
        $text = implode($lines, " ");
        unset( $lines );

        // this converts xml to big nasty data structure
        // the 0 means keep white space as it is (important for markdown format)
        // print_r it if you want to see what it looks like!
        $xml = xmlize( $text, 0 ); 

        // set up array to hold all our questions
        $questions = array();

        // iterate through questions
        foreach ($xml['quiz']['#']['question'] as $question) {
            $question_type = $question['@']['type'];
            $questiontype = get_string( 'questiontype','quiz',$question_type );

            if ($question_type=='multichoice') {
                $qo = $this->import_multichoice( $question );
            }  
            elseif ($question_type=='truefalse') {
                $qo = $this->import_truefalse( $question );
            }
            elseif ($question_type=='shortanswer') {
                $qo = $this->import_shortanswer( $question );
            }
            elseif ($question_type=='numerical') {
                $qo = $this->import_numerical( $question );
            }
            elseif ($question_type=='description') {
                $qo = $this->import_description( $question );
            }
            elseif ($question_type=='matching') {
                $qo = $this->import_matching( $question );
            }
            elseif ($question_type=='cloze') {
                $qo = $this->import_multianswer( $question );
            }
            elseif ($question_type=='essay') {
                $qo = $this->import_essay( $question );
            }
            elseif ($question_type=='calculated') {
                $qo = $this->import_calculated( $question );
            }
            elseif ($question_type=='category') {
                $qo = $this->import_category( $question );
            }
            else {
                // try for plugin support
                // no default question, as the plugin can call 
                // import_headers() itself if it wants to
                if (!$qo=$this->try_importing_using_qtypes( $question )) {
                    $notsupported = get_string( 'xmltypeunsupported','quiz',$question_type );
                    $this->error( $notsupported );
                    $qo = null;
                }
            }

            // stick the result in the $questions array
            if ($qo) {
                $questions[] = $qo;
            }
        }
        return $questions;
    }

    // EXPORT FUNCTIONS START HERE

    function export_file_extension() {
    // override default type so extension is .xml
    
        return ".xml";
    }


    /**
     * Turn the internal question code into a human readable form
     * (The code used to be numeric, but this remains as some of
     * the names don't match the new internal format)
     * @param mixed type_id Internal code
     * @return string question type string
     */
    function get_qtype( $type_id ) {
        switch( $type_id ) {
        case TRUEFALSE:
            $name = 'truefalse';
            break;
        case MULTICHOICE:
            $name = 'multichoice';
            break;
        case SHORTANSWER:
            $name = 'shortanswer';
            break;
        case NUMERICAL:
            $name = 'numerical';
            break;
        case MATCH:
            $name = 'matching';
            break;
        case DESCRIPTION:
            $name = 'description';
            break;
        case MULTIANSWER:
            $name = 'cloze';
            break;
        case ESSAY:
            $name = 'essay';
            break;
        case CALCULATED:
            $name = 'calculated';
            break;
        default:
            $name = false;
        }
        return $name;
    }

    /**
     * Convert internal Moodle text format code into
     * human readable form
     * @param int id internal code
     * @return string format text
     */
    function get_format( $id ) {
        switch( $id ) {
        case 0:
            $name = "moodle_auto_format";
            break;
        case 1:
            $name = "html";
            break;
        case 2:
            $name = "plain_text";
            break;
        case 3:
            $name = "wiki_like";
            break;
        case 4:
            $name = "markdown";
            break;
        default:
            $name = "unknown";
        }
        return $name;
    }

    /**
     * Convert internal single question code into 
     * human readable form
     * @param int id single question code
     * @return string single question string
     */
    function get_single( $id ) {
        switch( $id ) {
        case 0:
            $name = "false";
            break;
        case 1:
            $name = "true";
            break;
        default: