diff --git a/geoapi/api/Api.php b/geoapi/api/Api.php
index 958dddb..9e9848a 100644
--- a/geoapi/api/Api.php
+++ b/geoapi/api/Api.php
@@ -28,18 +28,41 @@ abstract class Api extends \Slim\Slim {
      * @var <T>:SqlManager 
      */
     protected $serialManager;
+
+    /**
+     * Variable for the contentype of XML
+     * @var string
+     */
     protected static $contentypeXML = "application/xml;charset=utf-8";
+
+    /**
+     * Variable for the contentype of Json
+     * @var string
+     */
     protected static $contentypeJson = "application/json;charset=utf-8";
 
     /**
-     * Default-Constructor
+     * Variable for the regex−string to search json-contenttype
+     * @var string 
+     */
+    private static $jsonRegStr = '/json/';
+
+    /**
+     * Keyword for the accept parameter of the requestheader
+     * @var string
+     */
+    private static $keyReqHeaderAccept = "Accept";
+
+    /**
+     * Constructor
+     * @param array[assoc] $headers - RequestHeader
      */
     public function __construct($headers = array()) {
         $this->connect();
         parent::__construct();
 
-// set content type td xml
-        if ($headers && preg_match('/json/', $headers["Accept"])) {
+        // set content type
+        if ($headers && array_key_exists(self::$keyReqHeaderAccept, $headers) && preg_match(self::$jsonRegStr, $headers[self::$keyReqHeaderAccept])) {
             $this->serialManager = new \utiliy\JsonManager();
             $this->contentType(self::$contentypeJson);
         } else {
diff --git a/geoapi/api/PisApi.php b/geoapi/api/PisApi.php
index eacc8f3..9ce27d5 100644
--- a/geoapi/api/PisApi.php
+++ b/geoapi/api/PisApi.php
@@ -24,10 +24,11 @@ class PisApi extends Api {
      * max number of pid for each query
      * @var int
      */
-    private $maxPid = 10;
+    private static $maxPid = 10;
 
     /**
-     * Default-Constructor
+     * Constructor
+     * @param array[assoc] $headers - RequestHeader
      */
     public function __construct($headers = array()) {
         $this->sqlManager = new \database\PisSqlManager();
@@ -48,7 +49,7 @@ class PisApi extends Api {
      */
     public function sendPisQuery($queryArgs) {
         $pidList =  \utiliy\ArrayManager::removeEmptyItmes($queryArgs);
-        if (count($pidList) < $this->maxPid) {
+        if (count($pidList) < self::$maxPid) {
             $result = $this->sqlManager->sendPisQuery($pidList);
            
             return $this->serialManager->arrayToPis($result);
diff --git a/geoapi/api/PssApi.php b/geoapi/api/PssApi.php
index c39ff21..a1a071c 100644
--- a/geoapi/api/PssApi.php
+++ b/geoapi/api/PssApi.php
@@ -25,10 +25,11 @@ class PssApi extends Api {
      * max number of pid for each query
      * @var int
      */
-    private $maxPid = 10;
+    private static $maxPid = 10;
 
     /**
-     * Default-Constructor
+     * Constructor
+     * @param array[assoc] $headers - RequestHeader
      */
     public function __construct($headers = array()) {
         $this->sqlManager = new \database\PssSqlManager();
@@ -50,7 +51,7 @@ class PssApi extends Api {
     public function sendPssQuery($queryArgs) {
         $pidList = \utiliy\ArrayManager::removeEmptyItmes($queryArgs);
 
-        if (count($pidList) < $this->maxPid) {
+        if (count($pidList) < self::$maxPid) {
             $result = $this->sqlManager->sendPssQuery($pidList);
             return $this->serialManager->arrayTopis($result);
         }
diff --git a/geoapi/api/SpsApi.php b/geoapi/api/SpsApi.php
index c25b7a1..c395a06 100644
--- a/geoapi/api/SpsApi.php
+++ b/geoapi/api/SpsApi.php
@@ -71,46 +71,47 @@ class SpsApi extends Api {
      * Varible for the range of the searchpolygon
      * @var float
      */
-    private $range = 1;
+    private static $range = 1;
 
     /*
      * Varible for the fist chars of the string for a Polygon
      * @var string
      */
-    private $polyStartStr = "GeomFromText('Polygon((";
+    private static $polyStartStr = "GeomFromText('Polygon((";
 
     /*
      * Varible for the last chars of the string for a Polygon
      * @var string
      */
-    private $polyEndStr = "))'";
+    private static $polyEndStr = "))'";
 
     /**
      * maximum value of latitude
      * @var float
      */
-    private $maxLat = 180;
+    private static $maxLat = 180;
 
     /**
      * minimum value of latitude
      * @var float
      */
-    private $minLat = -180;
+    private static $minLat = -180;
 
     /**
      * maximum value of longitude
      * @var float
      */
-    private $maxLong = 180;
+    private static $maxLong = 180;
 
     /**
      * minimum value of longitude
      * @var float
      */
-    private $minLong = -180;
+    private static $minLong = -180;
 
     /**
-     * Default-Constructor
+     * Constructor
+     * @param array[assoc] $headers - RequestHeader
      */
     public function __construct($headers = array()) {
         $this->sqlManager = new \database\SpsSqlManager();
@@ -142,18 +143,18 @@ class SpsApi extends Api {
     public function sendSpsCoordinateQuery($queryArgs) {
         
          // check arguments of the query
-        if (!array_key_exists(SpsApi::$keyLong, $queryArgs) || !array_key_exists(SpsApi::$keyLat, $queryArgs)) {
+        if (!array_key_exists(self::$keyLong, $queryArgs) || !array_key_exists(self::$keyLat, $queryArgs)) {
             return null;
         }
-        $latitude = $queryArgs[SpsApi::$keyLat];
-        $longitude = $queryArgs[SpsApi::$keyLong];
+        $latitude = $queryArgs[self::$keyLat];
+        $longitude = $queryArgs[self::$keyLong];
 
         if (!$this->validLatitude($latitude) || !$this->validLongitude($longitude)) {
             return null;
         }
 
         // build a request polygon
-        $queryArgs[SpsApi::$keyPoly] = $this->createPolygon($latitude, $longitude, $this->range);
+        $queryArgs[self::$keyPoly] = $this->createPolygon($latitude, $longitude, self::$range);
         
         // send querry
         $result = $this->sqlManager->sendSpsCoordinateQuery($queryArgs);
@@ -169,7 +170,7 @@ class SpsApi extends Api {
         $digitLessPoint = str_replace(".", "", $string);
         $digit = str_replace("-", "", $digitLessPoint);
         if (ctype_digit($digit)) {
-            if ($string <= $this->maxLong && $string >= $this->minLong) {
+            if ($string <= self::$maxLong && $string >= self::$minLong) {
                 return TRUE;
             }
         };
@@ -185,7 +186,7 @@ class SpsApi extends Api {
         $digitLessPoint = str_replace(".", "", $string);
         $digit = str_replace("-", "", $digitLessPoint);
         if (ctype_digit($digit)) {
-            if ($string <= $this->maxLat && $string >= $this->minLat) {
+            if ($string <= self::$maxLat && $string >= self::$minLat) {
                 return TRUE;
             }
         };
@@ -204,7 +205,7 @@ class SpsApi extends Api {
         $minLong = $longitude - $range;
         $maxLat = $latitude + $range;
         $maxLong = $longitude + $range;
-        return $this->polyStartStr . "$minLat $minLong,$minLat $maxLong,$maxLat $maxLong,$maxLat $minLong,$minLat $minLong" . $this->polyEndStr;
+        return self::$polyStartStr . "$minLat $minLong,$minLat $maxLong,$maxLat $maxLong,$maxLat $minLong,$minLat $minLong" . self::$polyEndStr;
     }
 
 }
diff --git a/geoapi/database/PisSqlManager.php b/geoapi/database/PisSqlManager.php
index 0ea9f49..9f7d3f5 100644
--- a/geoapi/database/PisSqlManager.php
+++ b/geoapi/database/PisSqlManager.php
@@ -36,19 +36,19 @@ class PisSqlManager extends SQLManager {
      * String for the select part of the query
      * @var string
      */
-    private $selectTerm = "SELECT pid, iName, iValue FROM pis WHERE ";
+    private static $selectTerm = "SELECT pid, iName, iValue FROM pis WHERE ";
 
     /**
      * String for the orderby part of the query
      * @var string
      */
-    private $orderByTerm = " ORDER BY pid, iName";
+    private static $orderByTerm = " ORDER BY pid, iName";
 
     /**
      * String for the pid part of the query
      * @var string
      */
-    private $pidTerm = "pid = ";
+    private static $pidTerm = "pid = ";
 
     /**
      * Default-Constructor
@@ -72,9 +72,9 @@ class PisSqlManager extends SQLManager {
     public function sendPisQuery($queryArgs) {
 
         // build query string
-        $query = $this->selectTerm;
+        $query = self::$selectTerm;
         if (\utiliy\ArrayManager::validIntList($queryArgs)) {
-            $query .= \utiliy\ArrayManager::toSqlWhereString($queryArgs,  $this->orTerm, $this->pidTerm) . $this->orderByTerm;
+            $query .= \utiliy\ArrayManager::toSqlWhereString($queryArgs, self::$orTerm, self::$pidTerm) . self::$orderByTerm;
         } else {
             return null;
         }
diff --git a/geoapi/database/PssSqlManager.php b/geoapi/database/PssSqlManager.php
index b55f325..eac7745 100644
--- a/geoapi/database/PssSqlManager.php
+++ b/geoapi/database/PssSqlManager.php
@@ -42,19 +42,19 @@ class PssSqlManager extends SQLManager {
      * String for the select part of the query
      * @var string
      */
-    private $selectTerm = "SELECT pid, sName, sap, request FROM pss WHERE ";
+    private static $selectTerm = "SELECT pid, sName, sap, request FROM pss WHERE ";
 
     /**
      * String for the orderby part of the query
      * @var string
      */
-    private $orderByTerm = " ORDER BY pid, sName";
+    private static $orderByTerm = " ORDER BY pid, sName";
 
     /**
      * String for the pid part of the query
      * @var string
      */
-    private $pidTerm = "pid = ";
+    private static $pidTerm = "pid = ";
 
     /**
      * Default-Constructor
@@ -78,10 +78,10 @@ class PssSqlManager extends SQLManager {
     public function sendPssQuery($queryArgs) {
 
         // build query string
-        $query = $this->selectTerm;
+        $query = self::$selectTerm;
 
         if (\utiliy\ArrayManager::validIntList($queryArgs)) {
-            $query .= \utiliy\ArrayManager::toSqlWhereString($queryArgs,  $this->orTerm, $this->pidTerm) . $this->orderByTerm;
+            $query .= \utiliy\ArrayManager::toSqlWhereString($queryArgs, self::$orTerm, self::$pidTerm) . self::$orderByTerm;
         } else {
             return null;
         };
diff --git a/geoapi/database/SpsSqlManager.php b/geoapi/database/SpsSqlManager.php
index cb3c1ca..38f64a1 100644
--- a/geoapi/database/SpsSqlManager.php
+++ b/geoapi/database/SpsSqlManager.php
@@ -30,61 +30,61 @@ class SpsSqlManager extends SQLManager {
      * String for the select part of the query
      * @var string
      */
-    private $selectTerm = "SELECT DISTINCT id, parent FROM sps WHERE ";
+    private static $selectTerm = "SELECT DISTINCT id, parent FROM sps WHERE ";
 
     /**
      * String for the alias part of the query
      * @var string
      */
-    private $aliasTerm = "alias = ";
+    private static $aliasTerm = "alias = ";
 
     /**
      * String for the did part of the query
      * @var string
      */
-    private $domainTerm = "did = ";
+    private static $domainTerm = "did = ";
 
     /**
      * String for the dNamet part of the query
      * @var string
      */
-    private $domainNameTerm = "dName = ";
+    private static $domainNameTerm = "dName = ";
 
     /**
      * first part of  intersect-function
      * @var string
      */
-    private $interSectTermStart = "Intersects(";
+    private static $interSectTermStart = "Intersects(";
 
     /**
      * last part of  intersect-function
      * @var string
      */
-    private $interSectTermEnd = "),plan)";
+    private static $interSectTermEnd = "),plan)";
 
     /**
      * first part of  GeomFromText('Polygon-function
      * @var string
      */
-    private $polyStartStr = "GeomFromText('Polygon((";
+    private static $polyStartStr = "GeomFromText('Polygon((";
 
     /**
      * last part of  GeomFromText('Polygon-function
      * @var string
      */
-    private $polyEndStr = "))'";
+    private static $polyEndStr = "))'";
 
     /**
      * maximium length of the value-string for an aliasname
      * @var int
      */
-    private $aliasMaxLenght = 32;
+    private static $aliasMaxLenght = 32;
 
     /**
      * maximium length of the value-string for a domainname
      * @var int
      */
-    private $domainMaxLenght = 32;
+    private static $domainMaxLenght = 32;
 
     /**
      * Default-Constructor
@@ -120,9 +120,9 @@ class SpsSqlManager extends SQLManager {
         }
 
         // build query string
-        $query = $this->selectTerm;
+        $query = self::$selectTerm;
         if ($this->validAliasString($alias)) {
-            $query .= $this->aliasTerm . $this->quoteTerm . $alias . $this->quoteTerm . $this->addDomainTerm($domain);
+            $query .= self::$aliasTerm . self::$quoteTerm . $alias . self::$quoteTerm . self::$addDomainTerm($domain);
         } else {
             return null;
         }
@@ -152,7 +152,7 @@ class SpsSqlManager extends SQLManager {
 
         // build query string
         if ($this->validPolyString($poly)) {
-            $query = $this->selectTerm . $this->interSectTermStart . $poly . $this->interSectTermEnd . $this->addDomainTerm($domain);
+            $query = self::$selectTerm . self::$interSectTermStart . $poly . self::$interSectTermEnd . $this->addDomainTerm($domain);
         } else {
             return null;
         }
@@ -171,9 +171,9 @@ class SpsSqlManager extends SQLManager {
         $result = null;
         if ($domain != null && $this->validDomainString($domain)) {
             if ($this->isDid($domain)) {
-                $result .= $this->andTerm . $this->domainTerm . $this->quoteTerm . $domain . $this->quoteTerm;
+                $result .= self::$andTerm . self::$domainTerm . self::$quoteTerm . $domain . self::$quoteTerm;
             } else {
-                $result .= $this->andTerm . $this->domainNameTerm . $this->quoteTerm . $domain . $this->quoteTerm;
+                $result .= self::$andTerm . self::$domainNameTerm . self::$quoteTerm . $domain . self::$quoteTerm;
             }
         }
         return $result;
@@ -185,7 +185,7 @@ class SpsSqlManager extends SQLManager {
      * @return boolean
      */
     private function validAliasString($alias) {
-        if (\utiliy\StringManager::validSQLString($alias) && ctype_alnum($alias) && strlen($alias) <= $this->aliasMaxLenght) {
+        if (\utiliy\StringManager::validSQLString($alias) && ctype_alnum($alias) && strlen($alias) <= self::$aliasMaxLenght) {
             return TRUE;
         }
         return FALSE;
@@ -197,7 +197,7 @@ class SpsSqlManager extends SQLManager {
      * @return boolean
      */
     private function validDomainString($domain) {
-        if (\utiliy\StringManager::validSQLString($domain) && ctype_alnum($domain) && strlen($domain) <= $this->domainMaxLenght) {
+        if (\utiliy\StringManager::validSQLString($domain) && ctype_alnum($domain) && strlen($domain) <= self::$domainMaxLenght) {
             return TRUE;
         }
         return FALSE;
@@ -209,8 +209,8 @@ class SpsSqlManager extends SQLManager {
      * @return boolean
      */
     private function validPolyString($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($poly, self::$polyStartStr) 
+                && \utiliy\StringManager::endsWith($poly, self::$polyEndStr)) {
             return TRUE;
         }
         return FALSE;
diff --git a/geoapi/database/SqlManager.php b/geoapi/database/SqlManager.php
index c5a54a9..ddaec35 100644
--- a/geoapi/database/SqlManager.php
+++ b/geoapi/database/SqlManager.php
@@ -46,19 +46,19 @@ abstract class SqlManager {
      * String for an and-operrator
      * @var string
      */
-    protected $andTerm = " and ";
+    protected static $andTerm = " and ";
 
     /**
      * String for an or-operrator
      * @var string
      */
-    protected $orTerm = " or ";
+    protected static $orTerm = " or ";
 
     /**
      * String for quotes in a query
      * @var string
      */
-    protected $quoteTerm = "\"";
+    protected static $quoteTerm = "\"";
 
     /**
      * Default-Constructor
diff --git a/geoapi/insert/loadcvs.php b/geoapi/insert/loadcvs.php
index adbd9ca..79a7e32 100644
--- a/geoapi/insert/loadcvs.php
+++ b/geoapi/insert/loadcvs.php
@@ -1,4 +1,9 @@
 <?php
+/**
+ * this script create from a csv  the insertstatements
+ * @author stubbfel
+ * @since 01.07.2013
+ */
 if (($handle = fopen("campustest.csv", "r")) !== FALSE) {
     $firstRow = true;
     while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
diff --git a/geoapi/service/pis/index.php b/geoapi/service/pis/index.php
index d130870..bd7d7bc 100644
--- a/geoapi/service/pis/index.php
+++ b/geoapi/service/pis/index.php
@@ -3,6 +3,7 @@
 include_once "../../global.inc.php";
 require_once PATH_API . "/PisApi.php";
 
+// get reguest header
 $headers = apache_request_headers();
 // instance a new api
 $app = new \api\PisApi($headers);
diff --git a/geoapi/service/pss/index.php b/geoapi/service/pss/index.php
index e6b37bb..c6e55cc 100644
--- a/geoapi/service/pss/index.php
+++ b/geoapi/service/pss/index.php
@@ -3,6 +3,7 @@
 include_once "../../global.inc.php";
 require_once PATH_API . "/PssApi.php";
 
+// get reguest header
 $headers = apache_request_headers();
 // instance a new api
 $app = new \api\PssApi($headers);
diff --git a/geoapi/service/sps/index.php b/geoapi/service/sps/index.php
index cb1d191..b4f0c57 100644
--- a/geoapi/service/sps/index.php
+++ b/geoapi/service/sps/index.php
@@ -2,6 +2,8 @@
 
 include_once "../../global.inc.php";
 require_once PATH_API . "/SpsApi.php";
+
+// get reguest header
 $headers = apache_request_headers();
 
 // instance a new api
diff --git a/geoapi/utility/JsonManager.php b/geoapi/utility/JsonManager.php
index 2f77641..7439786 100644
--- a/geoapi/utility/JsonManager.php
+++ b/geoapi/utility/JsonManager.php
@@ -34,7 +34,7 @@ class JsonManager implements SerialManager {
      * Name for the value of the placeInfoName item
      * @var string
      */
-    private static $placeInfoValueName = "placeInformationName";
+    private static $placeInfoValueName = "placeInformationValue";
 
     /**
      * Name for the placeServiceName item
@@ -56,15 +56,15 @@ class JsonManager implements SerialManager {
 
     /**
      * Method convert an array to a response json for the sps service
-     * 
+     * @example [{"id":"121799787","parentId":null}]
      * @param array[num][assoc] $result
      * @return json-string
      */
     public static function arrayToSpsJson($result) {
         $places = array();
         foreach ($result as $row) {
-            $place = array(JsonManager::$placeIdName => $row[\database\SpsSqlManager::$placeId],
-                JsonManager::$parentIdName => $row[\database\SpsSqlManager::$parentId]);
+            $place = array(self::$placeIdName => $row[\database\SpsSqlManager::$placeId],
+                self::$parentIdName => $row[\database\SpsSqlManager::$parentId]);
             array_push($places, $place);
         }
         return json_encode($places);
@@ -72,7 +72,7 @@ class JsonManager implements SerialManager {
 
     /**
      * Method convert an array to a response json for the pis service like
-     * 
+     *  @example [{"id":"127003463","0":{"placeInformationName":"name","placeInformationValue":"Informations-, Kommunikations- und Medienzentrum"},"1":{"placeInformationName":"typ","placeInformationValue":"library"}}]
      * @param array[num][assoc] $result
      * @return json-string
      */
@@ -80,6 +80,8 @@ class JsonManager implements SerialManager {
         $actPlace = 0;
 
         $infos = array();
+        $place = null;
+
         foreach ($result as $row) {
 
             // fetch  the place id of the row
@@ -87,16 +89,20 @@ class JsonManager implements SerialManager {
 
             // if the id is new -> add new place item
             if ($actPlace != $placeId) {
+                if ($place) {
+                    array_push($infos, $place);
+                }
+
                 $actPlace = $placeId;
-                $place = array(JsonManager::$placeIdName => $placeId);
-                array_push($infos, $place);
+                $place = array(self::$placeIdName => $placeId);
             }
 
             // add placeinformation item     
-            $placeInfo = array(JsonManager::$placeInfoName => $row[\database\PisSqlManager::$infName],
-                JsonManager::$placeInfoValueName => utf8_encode($row[\database\PisSqlManager::$infValue]));
+            $placeInfo = array(self::$placeInfoName => $row[\database\PisSqlManager::$infName], self::$placeInfoValueName => utf8_encode($row[\database\PisSqlManager::$infValue]));
             array_push($place, $placeInfo);
         }
+
+        array_push($infos, $place);
         return json_encode($infos);
     }
 
@@ -110,6 +116,7 @@ class JsonManager implements SerialManager {
         $actPlace = 0;
 
         $services = array();
+        $place = null;
         foreach ($result as $row) {
 
             // fetch  the place id of the row
@@ -117,30 +124,49 @@ class JsonManager implements SerialManager {
 
             // if the id is new -> add new place item
             if ($actPlace != $placeId) {
+                if ($place) {
+                    array_push($services, $place);
+                }
+
                 $actPlace = $placeId;
-                $place = array(JsonManager::$placeIdName => $placeId);
-                array_push($services, $place);
+                $place = array(self::$placeIdName => $placeId);
             }
 
             // add placeservice items
-            $placeSrv = array(JsonManager::$placeServiceName => $row[\database\PisSqlManager::$srvName],
-                JsonManager::$placeSapName => $row[\database\PisSqlManager::$srvSap],
-                JsonManager::$placeRequestName => $row[\database\PisSqlManager::$srvRequest]);
+            $placeSrv = array(self::$placeServiceName => $row[\database\PisSqlManager::$srvName],
+                self::$placeSapName => $row[\database\PisSqlManager::$srvSap],
+                self::$placeRequestName => $row[\database\PisSqlManager::$srvRequest]);
             array_push($place, $placeSrv);
         }
+        array_push($services, $place);
         return json_encode($services);
     }
 
+    /**
+     * Implement the arrayToSps from @see SerialManager
+     * @param array [num] [assoc] $result
+     * @return string
+     */
     public function arrayToSps($result) {
-        return JsonManager::arrayToSpsJson($result);
+        return self::arrayToSpsJson($result);
     }
 
+    /**
+     * Implement the arrayToPss from @see SerialManager
+     * @param array [num] [assoc] $result
+     * @return string
+     */
     public function arrayToPss($result) {
-        return JsonManager::arrayToPssJson($result);
+        return self::arrayToPssJson($result);
     }
 
+    /**
+     * Implement the arrayToPis from @see SerialManager
+     * @param array [num] [assoc] $result
+     * @return string
+     */
     public function arrayToPis($result) {
-        return JsonManager::arrayToPisJson($result);
+        return self::arrayToPisJson($result);
     }
 
 }
diff --git a/geoapi/utility/SerialManager.php b/geoapi/utility/SerialManager.php
index 55068d6..1979027 100644
--- a/geoapi/utility/SerialManager.php
+++ b/geoapi/utility/SerialManager.php
@@ -1,15 +1,34 @@
 <?php
+
 namespace utiliy;
 
 /**
- *
+ * This is an Interface for  the serialpation from sql-result to formatted string
  * @author stubbfel
+ * @since 01.07.2013
  */
 interface SerialManager {
-    
-public function arrayToSps($result);
-public function arrayToPis($result);
-public function arrayToPss($result);
+
+    /**
+     * Convert an array from the SPS to a formatted string
+     * @param array [num] [assoc] $result
+     * @return string
+     */
+    public function arrayToSps($result);
+
+    /**
+     * Convert an array from the PIS to a formatted string
+     * @param array [num] [assoc] $result
+     * @return string
+     */
+    public function arrayToPis($result);
+
+    /**
+     * Convert an array from the PSS to a formatted string
+     * @param array [num] [assoc] $result
+     * @return string
+     */
+    public function arrayToPss($result);
 }
 
 ?>
diff --git a/geoapi/utility/XmlManager.php b/geoapi/utility/XmlManager.php
index edac86d..c4904cf 100644
--- a/geoapi/utility/XmlManager.php
+++ b/geoapi/utility/XmlManager.php
@@ -80,12 +80,12 @@ class XmlManager  implements SerialManager{
      * @return xml-string
      */
     public static function arrayToSpsXml($result) {
-        $xml = new \SimpleXMLElement(XmlManager::$defaultXmlDoc);
+        $xml = new \SimpleXMLElement(self::$defaultXmlDoc);
 
         foreach ($result as $row) {
-            $place = $xml->addChild(XmlManager::$placeElementName);
-            $place->addAttribute(XmlManager::$placeIdAttrName, $row[\database\SpsSqlManager::$placeId]);
-            $place->addAttribute(XmlManager::$parentIdAttrName, $row[\database\SpsSqlManager::$parentId]);
+            $place = $xml->addChild(self::$placeElementName);
+            $place->addAttribute(self::$placeIdAttrName, $row[\database\SpsSqlManager::$placeId]);
+            $place->addAttribute(self::$parentIdAttrName, $row[\database\SpsSqlManager::$parentId]);
         }
         return $xml->asXML();
     }
@@ -100,7 +100,7 @@ class XmlManager  implements SerialManager{
      * @return xml-string
      */
     public static function arrayToPisXml($result) {
-        $xml = new \SimpleXMLElement(XmlManager::$defaultXmlDoc);
+        $xml = new \SimpleXMLElement(self::$defaultXmlDoc);
         $actPlace = 0;
 
         foreach ($result as $row) {
@@ -111,13 +111,13 @@ class XmlManager  implements SerialManager{
             // if the id is new -> add new place element
             if ($actPlace != $placeId) {
                 $actPlace = $placeId;
-                $place = $xml->addChild(XmlManager::$placeElementName);
-                $place->addAttribute(XmlManager::$placeIdAttrName, $placeId);
+                $place = $xml->addChild(self::$placeElementName);
+                $place->addAttribute(self::$placeIdAttrName, $placeId);
             }
 
             // add placeinformation elment
-            $placeInfo = $place->addChild(XmlManager::$placeInfoElementName, utf8_encode($row[\database\PisSqlManager::$infValue]));
-            $placeInfo->addAttribute(XmlManager::$placeInfoAttrName, $row[\database\PisSqlManager::$infName]);
+            $placeInfo = $place->addChild(self::$placeInfoElementName, utf8_encode($row[\database\PisSqlManager::$infValue]));
+            $placeInfo->addAttribute(self::$placeInfoAttrName, $row[\database\PisSqlManager::$infName]);
         }
         return $xml->asXML();
     }
@@ -135,7 +135,7 @@ class XmlManager  implements SerialManager{
      * @return xml-string
      */
     public static function arrayToPssXml($result) {
-        $xml = new \SimpleXMLElement(XmlManager::$defaultXmlDoc);
+        $xml = new \SimpleXMLElement(self::$defaultXmlDoc);
         $actPlace = 0;
 
         foreach ($result as $row) {
@@ -146,29 +146,29 @@ class XmlManager  implements SerialManager{
             // if the id is new -> add new place element
             if ($actPlace != $placeId) {
                 $actPlace = $placeId;
-                $place = $xml->addChild(XmlManager::$placeElementName);
-                $place->addAttribute(XmlManager::$placeIdAttrName, $placeId);
+                $place = $xml->addChild(self::$placeElementName);
+                $place->addAttribute(self::$placeIdAttrName, $placeId);
             }
 
             // add placeservice elment
-            $placeSrv = $place->addChild(XmlManager::$placeServiceElementName);
-            $placeSrv->addAttribute(XmlManager::$placeServiceAttrName, $row[\database\PssSqlManager::$srvName]);
-            $placeSrv->addChild(XmlManager::$placeSapElementName, $row[\database\PssSqlManager::$srvSap]);
-            $placeSrv->addChild(XmlManager::$placeRequestElementName, $row[\database\PssSqlManager::$srvRequest]);
+            $placeSrv = $place->addChild(self::$placeServiceElementName);
+            $placeSrv->addAttribute(self::$placeServiceAttrName, $row[\database\PssSqlManager::$srvName]);
+            $placeSrv->addChild(self::$placeSapElementName, $row[\database\PssSqlManager::$srvSap]);
+            $placeSrv->addChild(self::$placeRequestElementName, $row[\database\PssSqlManager::$srvRequest]);
         }
         return $xml->asXML();
     }
     
     public function arrayToSps($result) {
-        return XmlManager::arrayToSpsXml($result);
+        return self::arrayToSpsXml($result);
     }
     
     public function arrayToPis($result){
-        return XmlManager::arrayToPisXml($result); 
+        return self::arrayToPisXml($result); 
     }
     
     public function arrayToPss($result) {
-        return XmlManager::arrayToPssXml($result);
+        return self::arrayToPssXml($result);
     }
 
 }