--- a/develop/models/extractapp.php	Fri Mar 06 17:56:48 2015 +0100
+++ b/develop/models/extractapp.php	Sun Mar 08 22:28:21 2015 +0100
@@ -8,7 +8,8 @@
 		return array("Index Value 1", "Value 2", "Value 3");
 	}
     
-    protected $section_id = 0, $data_path, $file_id = 0, $current_fileId=0, $branch_id = 0, $user_id = 0, $lg_text = "", $topic = 0;
+    protected $section_id = 0, $data_path, $file_id = 0, $current_fileId=0, 
+        $branch_id = 0, $user_id = 0, $lg_text = "", $topic = 0, $taglist_infile = "", $book_meta = "";
     public $messages = "";
 
     private function Initialize($_urlvalues) {
@@ -193,26 +194,49 @@
     */
 
 
+    private function Taglist_infileUpToDate($taglistArray) {
+        // compare $this->taglist_infile is the same as $taglistArray
+        $taglist_infile = $this->taglist_infile;
+        if (count($taglist_infile) != count($taglistArray)) {
+            return false;
+        }
 
+        foreach ($taglistArray as $row_indb) {
+            foreach ($taglist_infile as $row) {
+                //$taglistArray: array( $row['id'], $row['name'], $row['tag'], $row['color'] )
+                if ($row[0] == $row_indb[0] && $row[1] == $row_indb[1] && $row[2] == $row_indb[2] && $row[3] == $row_indb[3]) {
+
+                } else {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
     // === for tagging ===
     public function StartTagging() {
        
-        // $this->Initialize($urlvalues);
-
         $section_id = $this->section_id;
         $stringInput = $this->lg_text;
-        
+
+        $data = array();    // data array to be passed to view
 
         //$taglistArray = $this->GetTaglistArray();
         //for GetTaglistByTopicID: 
         $taglistArray = $this->GetTaglistByTopicID($this->GetTopic());
+        
+        // TODO: check if taglist_infile is up-to-date
+        if ( !$this->Taglist_infileUpToDate($taglistArray)) {
+            $data['taglist_infile'] = $this->taglist_infile;
+        } 
+        
+
         // topic list
         $topiclistArray = $this->GetTopiclistArray();
 
 
         $wordlistArray = $this->GetWordlistArray();
 
-        $data = array();
         $data['stringInput'] = $stringInput;
         $data['taglistArray'] = $taglistArray;
         $data['wordlistArray'] = $wordlistArray;
@@ -1119,6 +1143,31 @@
         return $data;
     }
 
+    private function ParseMetaData($filename) {
+        $text = file_get_contents($filename);
+        $xml = simplexml_load_string($text) or die("Error: Cannot load from xml string");
+
+        $this->topic = $xml->topic; // set topic id
+
+        // get taglist in file
+        $taglist_infile = $xml->taglist;
+        $taglistArray = array();
+        foreach ($taglist_infile as $row) {
+            array_push($taglistArray, array((string)$row->id, (string)$row->name, (string)$row->tag, (string)$row->color));
+        }
+        $this->taglist_infile = $taglistArray; 
+
+        // TODO: get meta data of book
+        $this->book_meta = $xml->book;
+
+        // echo $taglist->name.", ".$taglist->tag."," .$taglist->color;
+        // --- detect if the taglist set is up-to-date or not ---
+
+
+        $contentString = $xml->text_content->asXML();
+
+        return $contentString;
+    }
     private function GetSectionContent() {
         $section_id = $this->GetSectionId();
         $section_info = $this->GetSectionInfo();
@@ -1130,8 +1179,10 @@
         $contentString="";
         $data_path = $this->GetDataPath();
         if ( file_exists($data_path."parsing_files/".$section_id.".txt") ) {
-            $contentString=file_get_contents($data_path."parsing_files/".$section_id.".txt");
-            $stringInput = $contentString;
+            $filename = $data_path."parsing_files/".$section_id.".txt";
+             // --- parsing meta data
+            $stringInput = $this->ParseMetaData($filename);
+            // ----
 
             // if the text is from file system
             $stringInput = preg_replace("/ /u", "○", $stringInput);