diff --git a/geoapi/api/Api.php b/geoapi/api/Api.php
index 9e02459..fa8abc2 100644
--- a/geoapi/api/Api.php
+++ b/geoapi/api/Api.php
@@ -23,9 +23,11 @@ abstract class Api extends \Slim\Slim {
     /**
      * Default-Constructor
      */
-    public function __construct() {        
+    public function __construct() {
         $this->connect();
         parent::__construct();
+
+        // set content type td xml
         $this->contentType("Content-type: application/xml;charset=utf-8");
     }
 
@@ -33,6 +35,8 @@ abstract class Api extends \Slim\Slim {
      * Default-DeConstructor
      */
     public function __destruct() {
+
+        // destroy the sqlManager
         $this->sqlManager->closeConnection();
         unset($this->sqlManager);
         $this->sqlManager = null;
diff --git a/geoapi/api/PisApi.php b/geoapi/api/PisApi.php
index ff072d2..7fa43e8 100644
--- a/geoapi/api/PisApi.php
+++ b/geoapi/api/PisApi.php
@@ -9,7 +9,7 @@ include_once PATH_UTILITTY . "/ArrayManager.php";
 require_once PATH_API . "/Api.php";
 
 /**
- * This class provides some spezial SpsAPI methods
+ * This class provides some spezial PisAPI methods
  * @author stubbfel
  * @since 20.06.2013
  */
diff --git a/geoapi/api/PssApi.php b/geoapi/api/PssApi.php
index 3ffbcef..f35dcd8 100644
--- a/geoapi/api/PssApi.php
+++ b/geoapi/api/PssApi.php
@@ -9,7 +9,7 @@ include_once PATH_UTILITTY . "/ArrayManager.php";
 require_once PATH_API . "/Api.php";
 
 /**
- * This class provides some spezial SpsAPI methods
+ * This class provides some spezial PssAPI methods
  * @author stubbfel
  * @since 20.06.2013
  */
@@ -52,7 +52,6 @@ class PssApi extends Api {
 
         if (count($pidList) < $this->maxPid) {
             $result = $this->sqlManager->sendPssQuery($pidList);
-
             return \utiliy\XmlManager::arrayToPssXml($result);
         }
         return NULL;
diff --git a/geoapi/api/SpsApi.php b/geoapi/api/SpsApi.php
index 955f5a2..65c53ff 100644
--- a/geoapi/api/SpsApi.php
+++ b/geoapi/api/SpsApi.php
@@ -21,7 +21,7 @@ class SpsApi extends Api {
     public static $routeParameterAlias = "/alias/:alias";
 
     /**
-     * Route string for the alias paramter
+     * Route string for the domain paramter
      * @var string
      */
     public static $routeParameterDomain = "/domain/:domain";
@@ -116,7 +116,6 @@ class SpsApi extends Api {
     public function __construct() {
         $this->sqlManager = new \database\SpsSqlManager();
         parent::__construct();
-        $this->contentType("Content-type: application/xml;charset=utf-8");
     }
 
     /**
@@ -142,6 +141,8 @@ class SpsApi extends Api {
      * @return querry result as xml
      */
     public function sendSpsCoordinateQuery($queryArgs) {
+        
+         // check arguments of the query
         if (!array_key_exists(SpsApi::$keyLong, $queryArgs) || !array_key_exists(SpsApi::$keyLat, $queryArgs)) {
             return null;
         }
@@ -152,7 +153,10 @@ class SpsApi extends Api {
             return null;
         }
 
+        // build a request polygon
         $queryArgs[SpsApi::$keyPoly] = $this->createPolygon($latitude, $longitude, $this->range);
+        
+        // send querry
         $result = $this->sqlManager->sendSpsCoordinateQuery($queryArgs);
         return \utiliy\XmlManager::arrayToSpsXml($result);
     }
diff --git a/geoapi/config/config.db.php b/geoapi/config/config.db.php
index 6dc498f..23aab87 100644
--- a/geoapi/config/config.db.php
+++ b/geoapi/config/config.db.php
@@ -4,6 +4,9 @@ namespace config;
 
 /**
  * This clas is an container for the DBConf
+ * 
+ * @author stubbfel
+ * @since 20.06.2013
  */
 class DBConfig {
 
diff --git a/geoapi/database/PisSqlManager.php b/geoapi/database/PisSqlManager.php
index 97e9cb4..0ea9f49 100644
--- a/geoapi/database/PisSqlManager.php
+++ b/geoapi/database/PisSqlManager.php
@@ -7,7 +7,7 @@ include_once PATH_UTILITTY . "/StringManager.php";
 require_once PATH_DATABASE . "/SqlManager.php";
 
 /**
- * Description of ZisSqlManager
+ * Description of PisSqlManager
  * 
  * @author stubbfel
  * @since 20.06.2013
@@ -58,7 +58,7 @@ class PisSqlManager extends SQLManager {
     }
 
     /**
-     * Default-DEConstructor
+     * Default-DeConstructor
      */
     public function __destruct() {
         parent::__destruct();
diff --git a/geoapi/database/PssSqlManager.php b/geoapi/database/PssSqlManager.php
index 5fc243d..b55f325 100644
--- a/geoapi/database/PssSqlManager.php
+++ b/geoapi/database/PssSqlManager.php
@@ -7,7 +7,7 @@ include_once PATH_UTILITTY . "/ArrayManager.php";
 require_once PATH_DATABASE . "/SqlManager.php";
 
 /**
- * Description of ZisSqlManager
+ * Description of PssSqlManager
  * 
  * @author stubbfel
  * @since 20.06.2013
@@ -64,7 +64,7 @@ class PssSqlManager extends SQLManager {
     }
 
     /**
-     * Default-DEConstructor
+     * Default-DeConstructor
      */
     public function __destruct() {
         parent::__destruct();
diff --git a/geoapi/database/SpsSqlManager.php b/geoapi/database/SpsSqlManager.php
index 85c66b4..cb3c1ca 100644
--- a/geoapi/database/SpsSqlManager.php
+++ b/geoapi/database/SpsSqlManager.php
@@ -209,7 +209,8 @@ class SpsSqlManager extends SQLManager {
      * @return boolean
      */
     private function validPolyString($poly) {
-        if (\utiliy\StringManager::validSQLString($poly) && \utiliy\StringManager::startsWith($poly, $this->polyStartStr) && \utiliy\StringManager::endsWith($poly, $this->polyEndStr)) {
+        if (\utiliy\StringManager::validSQLString($poly) && \utiliy\StringManager::startsWith($poly, $this->polyStartStr) 
+                && \utiliy\StringManager::endsWith($poly, $this->polyEndStr)) {
             return TRUE;
         }
         return FALSE;
diff --git a/geoapi/database/SqlManager.php b/geoapi/database/SqlManager.php
index bc28073..c5a54a9 100644
--- a/geoapi/database/SqlManager.php
+++ b/geoapi/database/SqlManager.php
@@ -74,15 +74,15 @@ abstract class SqlManager {
      * Default-DEConstructor
      */
     public function __destruct() {
+        
+        // close connection
         $this->closeConnection();
+        
+        // delete connection parameter
         unset($this->serverAddress);
         unset($this->dbName);
         unset($this->userName);
         unset($this->userPW);
-        $this->serverAddress = null;
-        $this->dbName = null;
-        $this->userName = null;
-        $this->userPW = null;
     }
 
     /**
@@ -116,17 +116,24 @@ abstract class SqlManager {
      * @return result[num][assoc]
      */
     protected function query($query) {
+        
+        // send error
         $mysqlResult = mysql_query($query, $this->link);
         if (!$mysqlResult) {
             exit("Query error: " . mysql_error());
         }
+        
+        // fetch result
         $rowNums = mysql_num_rows($mysqlResult);
         $result = array();
         for ($i = 0; $i < $rowNums; $i++) {
             $row = mysql_fetch_assoc($mysqlResult);
             $result[$i] = $row;
         }
+        
+        // call gc
         mysql_free_result($mysqlResult);
+        
         return $result;
     }
 }
diff --git a/geoapi/service/pis/index.php b/geoapi/service/pis/index.php
index bed4a17..5d66718 100644
--- a/geoapi/service/pis/index.php
+++ b/geoapi/service/pis/index.php
@@ -6,6 +6,7 @@ require_once PATH_API . "/PisApi.php";
 // instance a new api
 $app = new \api\PisApi();
 
+// HTTP-Get-Method
 $app->get(\api\PisApi::$routeParameterPids, function ($pid) use ($app) {
            echo $app->sendPisQuery($pid);
         });
diff --git a/geoapi/service/pss/index.php b/geoapi/service/pss/index.php
index 0bf0278..61bcbab 100644
--- a/geoapi/service/pss/index.php
+++ b/geoapi/service/pss/index.php
@@ -6,9 +6,11 @@ require_once PATH_API . "/PssApi.php";
 // instance a new api
 $app = new \api\PssApi();
 
+// HTTP-Get-Method
 $app->get(\api\PssApi::$routeParameterPids, function ($pid) use ($app) {
            echo $app->sendPssQuery($pid);
         });
 
 $app->run();
+
 ?>
diff --git a/geoapi/service/sps/index.php b/geoapi/service/sps/index.php
index 8dddc5c..9e33d0f 100644
--- a/geoapi/service/sps/index.php
+++ b/geoapi/service/sps/index.php
@@ -6,8 +6,7 @@ require_once PATH_API . "/SpsApi.php";
 // instance a new api
 $app = new \api\SpsApi();
 
-// declare the get-methods
-// declare the get-methods
+// HTTP-Get-Methods
 $app->get(\api\SpsApi::$routeParameterAlias, function ($alias) use ($app) {
             $args = array();
             $args[\api\SpsApi::$keyAlias] = $alias;
diff --git a/geoapi/utility/ArrayManager.php b/geoapi/utility/ArrayManager.php
index ad18f21..dd25289 100644
--- a/geoapi/utility/ArrayManager.php
+++ b/geoapi/utility/ArrayManager.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace utiliy;
 
 include_once "../../global.inc.php";
@@ -10,9 +11,9 @@ include_once PATH_UTILITTY . "/StringManager.php";
  * @since 26.06.2013
  */
 class ArrayManager {
-       
+
     /**
-     * Method remove all empty itmes
+     * Method remove all empty itmes of an array
      * @param array $queryArgs
      * @return array
      */
@@ -24,9 +25,9 @@ class ArrayManager {
         }
         return $array;
     }
-    
+
     /**
-     * Method convert a pidList to a where-string
+     * Method convert an array to a where-string like $fieldname = $array[i] $operator
      * @param array $pidList
      * @return string
      */
@@ -38,9 +39,9 @@ class ArrayManager {
         $result = substr($arrayStr, 0, strlen($arrayStr) - strlen($operator));
         return $result;
     }
-    
-        /**
-     * Method check if  all items of the pidlist are only digits
+
+    /**
+     * Method check if  all items of the array are only digits and < PHP_INT_MAX
      * @param array $poly
      * @return boolean
      */
@@ -53,6 +54,7 @@ class ArrayManager {
         }
         return TRUE;
     }
+
 }
 
 ?>
diff --git a/geoapi/utility/StringManager.php b/geoapi/utility/StringManager.php
index f276d59..1312e1c 100644
--- a/geoapi/utility/StringManager.php
+++ b/geoapi/utility/StringManager.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace utiliy;
 
 include_once "../../global.inc.php";
@@ -9,36 +10,34 @@ include_once "../../global.inc.php";
  * @since 25.06.2013
  */
 class StringManager {
-    
+
     /**
-     * A Constant vor an emptystring like \"\"
+     * A Constant vor an emptystring like ""
      * @var string 
      */
     public static $emptyString = "";
 
-
     /**
-     * Method check if a certain string start with a certain sustring
+     * Method check if a certain string start with a certain substring
      * @param string $haystack
      * @param string $needle
      * @return boolean
      */
-   public static function startsWith($haystack, $needle) {
+    public static function startsWith($haystack, $needle) {
         return !strncmp($haystack, $needle, strlen($needle));
     }
 
-       
     /**
-     * Method check if a certain string end with a certain sustring
+     * Method check if a certain string end with a certain substring
      * @param string $haystack
      * @param string $needle
      * @return boolean
      */
-   public static function endsWith($haystack, $needle) {
+    public static function endsWith($haystack, $needle) {
         return (substr($haystack, -strlen($needle)) === $needle);
     }
-    
-        /**
+
+    /**
      * Method if the string is not a empty String (not only spaces and controlls)
      * @param string $string
      * @return boolean
@@ -49,6 +48,7 @@ class StringManager {
         }
         return FALSE;
     }
+
 }
 
 ?>
diff --git a/geoapi/utility/XmlManager.php b/geoapi/utility/XmlManager.php
index 0b737c5..8465a44 100644
--- a/geoapi/utility/XmlManager.php
+++ b/geoapi/utility/XmlManager.php
@@ -36,34 +36,34 @@ class XmlManager {
     private static $placeServiceElementName = "placeService";
 
     /**
-     * Name for the placesap element
+     * Name for the ssap element
      * @var string
      */
     private static $placeSapElementName = "sap";
 
     /**
-     * Name for the placerequest element
+     * Name for the request element
      * @var string
      */
     private static $placeRequestElementName = "request";
 
     /**
-     * Name for the placeInfoName  attribute
+     * Name for the placeInfoName attribute
      * @var string
      */
-    private static $placeInfoName = "placeInformationName";
+    private static $placeInfoAttrName = "placeInformationName";
 
     /**
      * Name for the placeServiceName  attribute
      * @var string
      */
-    private static $placeServiceName = "placeServiceName";
+    private static $placeServiceAttrName = "placeServiceName";
 
     /**
      * Name for the placeid attribute
      * @var string
      */
-    private  static $placeIdAttrName = "id";
+    private static $placeIdAttrName = "id";
 
     /**
      * Name for the parent attribute
@@ -73,6 +73,8 @@ class XmlManager {
 
     /**
      * Method convert an array to a response xml for the sps service
+     * <place id ="4711" parentID=%0815"/>
+     * 
      * @param array[num][assoc] $result
      * @return xml-string
      */
@@ -88,7 +90,11 @@ class XmlManager {
     }
 
     /**
-     * Method convert an array to a response xml for the pis service
+     * Method convert an array to a response xml for the pis service like
+     * <place id ="4711">
+     * <placeInformation placeInformationName = "key">Value</placeinformation>
+     * </place>
+     * 
      * @param array[num][assoc] $result
      * @return xml-string
      */
@@ -110,13 +116,20 @@ class XmlManager {
 
             // add placeinformation elment
             $placeInfo = $place->addChild(XmlManager::$placeInfoElementName, utf8_encode($row[\database\PisSqlManager::$infValue]));
-            $placeInfo->addAttribute(XmlManager::$placeInfoName, $row[\database\PisSqlManager::$infName]);
+            $placeInfo->addAttribute(XmlManager::$placeInfoAttrName, $row[\database\PisSqlManager::$infName]);
         }
         return $xml->asXML();
     }
 
     /**
      * Method convert an array to a response xml for the pss service
+     * <place id ="4711">
+     * <placeService placeServiceName = "key">
+     * <sap>sapValue</sap>
+     * <request>reqVaule</request>
+     * </placeService>
+     * </place>
+     * 
      * @param array[num][assoc] $result
      * @return xml-string
      */
@@ -138,7 +151,7 @@ class XmlManager {
 
             // add placeservice elment
             $placeSrv = $place->addChild(XmlManager::$placeServiceElementName);
-            $placeSrv->addAttribute(XmlManager::$placeServiceName, $row[\database\PssSqlManager::$srvName]);
+            $placeSrv->addAttribute(XmlManager::$placeServiceAttrName, $row[\database\PssSqlManager::$srvName]);
             $placeSrv->addChild(XmlManager::$placeSapElementName, $row[\database\PssSqlManager::$srvSap]);
             $placeSrv->addChild(XmlManager::$placeRequestElementName, $row[\database\PssSqlManager::$srvRequest]);
         }