diff --git a/classes/xml/XmlQueryParser.class.php b/classes/xml/XmlQueryParser.class.php
index 333baf34e..e322e0db6 100644
--- a/classes/xml/XmlQueryParser.class.php
+++ b/classes/xml/XmlQueryParser.class.php
@@ -2,16 +2,21 @@
     /**
      * @class XmlQueryParser
      * @author zero (zero@nzeo.com)
-     * @brief query xml을 파싱하여 캐싱을 한 후 결과를 return
+     * @brief case to parse XE xml query 
      * @version 0.1
      *
-     * @todo subquery나 union등의 확장 쿼리에 대한 지원이 필요
+     * @todo need to support extend query such as subquery, union
      **/
 
     class XmlQueryParser extends XmlParser {
 
         /**
-         * @brief 쿼리 파일을 찾아서 파싱하고 캐싱한다
+         * @brief parse a xml query file and save the result as a new file specified by cache_file
+         * @param[in] $query_id name of query
+         * @param[in] $xml_file file path of a xml query file to be loaded
+         * @param[in] $cache_file file path of a cache file to store resultant php code after parsing xml query
+         * @return Nothing is requred.
+         * @remarks {there should be a way to report an error}
          **/
         function parse($query_id, $xml_file, $cache_file) {
             // query xml 파일을 찾아서 파싱, 결과가 없으면 return
@@ -240,6 +245,12 @@
             FileHandler::writeFile($cache_file, $buff);
         }
 
+        /**
+        * @brief transfer given column information to object->columns
+        * @param[in] column information
+        * @result Returns $object 
+        */
+
         function _setColumn($columns){
             if(!$columns) {
                 $output->column[] = array("*" => "*");
@@ -270,6 +281,11 @@
             return $output;
         }
 
+        /**
+        * @brief transfer condition information to $object->conditions
+        * @param[in] SQL condition information
+        * @result Returns $output
+        */
         function _setConditions($conditions){
             // 조건절 정리
 
@@ -308,6 +324,11 @@
             return $output;
         }
 
+        /**
+        * @brief transfer condition information to $object->groups
+        * @param[in] SQL group information
+        * @result Returns $output
+        */
         function _setGroup($group_list){
             // group 정리
 
@@ -325,6 +346,11 @@
         }
 
 
+        /**
+        * @brief transfer pagnation information to $output
+        * @param[in] $xml_obj xml object containing Navigation information
+        * @result Returns $output
+        */
         function _setNavigation($xml_obj){
             $navigation = $xml_obj->query->navigation;
             if($navigation) {
@@ -348,6 +374,12 @@
             return $output;
         }
 
+        /**
+        * @brief retrieve column information from $output->colums to generate corresponding php code 
+        * @param[in] $column 
+        * @remarks the name of this method is misleading.
+        * @result Returns string buffer containing php code
+        */
         function _getColumn($columns){
             $buff = '';
 			$str = '';
@@ -392,6 +424,12 @@
             return $buff;
         }
 
+        /**
+        * @brief retrieve condition information from $output->condition to generate corresponding php code 
+        * @param[in] $conditions array containing Query conditions
+        * @remarks the name of this method is misleading.
+        * @return Returns string buffer containing php code
+        */
         function _getConditions($conditions){
             $buff = '';
             foreach($conditions as $key => $val) {
@@ -418,9 +456,13 @@
             return $buff;
         }
 
+
         /**
-         * @brief column, condition등의 key에 default 값을 세팅
-         **/
+        * @brief returns predefined default values correspoding to given parameters 
+        * @param[in] $name 
+        * @param[in] $value
+        * @return Returns a default value for specified field
+        */
         function getDefault($name, $value) {
             $db_info = Context::getDBInfo ();
             if(!$value) return;