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diff --git a/common/src/main/java/at/gv/egovernment/moa/util/StringUtils.java b/common/src/main/java/at/gv/egovernment/moa/util/StringUtils.java
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index 000000000..ad879d2b6
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+++ b/common/src/main/java/at/gv/egovernment/moa/util/StringUtils.java
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+/*
+ * Copyright 2003 Federal Chancellery Austria
+ * MOA-ID has been developed in a cooperation between BRZ, the Federal
+ * Chancellery Austria - ICT staff unit, and Graz University of Technology.
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+
+
+package at.gv.egovernment.moa.util;
+
+import java.util.StringTokenizer;
+
+/**
+ * Utitility functions for string manipulations.
+ * 
+ * @author Harald Bratko
+ */
+public class StringUtils {
+
+  /**
+   * Removes all blanks and tabs from the given string.
+   * 
+   * @param s The string to remove all blanks and tabs from.
+   * @return  The input string with all blanks and tabs removed from. 
+   */
+  public static String removeBlanks(String s) {
+    StringTokenizer st = new StringTokenizer(s);
+    StringBuffer sb = new StringBuffer(s.length());
+    while (st.hasMoreTokens()) {
+      sb.append(st.nextToken());
+    }
+    return sb.toString();
+  }
+  
+  /**
+   * Removes all occurences of the specified token from the the given string.
+   * 
+   * @param s The string to remove all occurences of the specified token from.
+   * @return  The input string with all occurences of the specified token removed from. 
+   */
+  public static String removeToken(String s, String token) {
+    StringTokenizer st = new StringTokenizer(s, token);
+    StringBuffer sb = new StringBuffer(s.length());
+    while (st.hasMoreTokens()) {
+      sb.append(st.nextToken());
+    }
+    return sb.toString();
+  }
+  
+  /**
+   * Removes all leading zeros from the input string.
+   * 
+   * @param s       The string remove the leading zeros from.
+   * @return        The input string with the leading zeros removed from.
+   */
+  public static String deleteLeadingZeros(String s) {
+    StringBuffer sb = new StringBuffer(s);
+    int l = sb.length();
+    int j = 0;
+    for (int i=0; i<l; i++) {
+      if (sb.charAt(i) == '0') {
+        j++;
+      } else {
+        break;
+      }
+    }
+    return sb.substring(j, l);
+  }
+  
+  /**
+   * Replaces each substring of string <code>s</code> that matches the given
+   * <code>search</code> string by the given <code>replace</code> string.
+   * 
+   * @param s         The string where the replacement should take place.
+   * @param search    The pattern that should be replaced.
+   * @param replace   The string that should replace all each <code>search</code>
+   *                  string within <code>s</code>.
+   * @return          A string where all occurrence of <code>search</code> are
+   *                  replaced with <code>replace</code>.
+   */
+  public static String replaceAll (String s, String search, String replace)
+  {
+     StringBuffer sb = new StringBuffer();
+     int i = 0, j = 0;
+     int len = search.length();
+     while (j > -1)
+     {
+         j = s.indexOf(search, i);
+
+         if (j > -1)
+         {
+           sb.append(s.substring(i,j));
+           sb.append(replace);
+           i = j + len;
+         }
+     }
+     
+     sb.append(s.substring(i, s.length()));
+
+     return sb.toString();
+  }
+  
+  /**
+   * Changes the SecurityLayer version in the given string.
+   * This method usually takes as input an XML structure represented in a string
+   * format and changes the SecurityLayer namespaces prefixes and URIs from
+   * one SecurityLayer version to another.
+   * e.g.: code>sl10</code> to <code>sl</code> and 
+   * <code>http://www.buergerkarte.at/namespaces/securitylayer/20020225#</code>
+   * to
+   * <code>http://www.buergerkarte.at/namespaces/securitylayer/1.2#</code> 
+   * 
+   * @param s             The string (usally an XML structure) where the
+   *                      SecurityLayer version should be changed.
+   * @param slPrefixOld   The SecurityLayer namespace prefix that should be  
+   *                      replaced by the new one.
+   * @param slPrefixNew   The new SecurityLayer namespace prefix that should 
+   *                      replace the old one.
+   * @param slNSUriOld    The SecurityLayer namespace URI that should be  
+   *                      replaced by the new one.
+   * @param slNSUriNew    The new SecurityLayer namespace URI that should 
+   *                      replace the old one.
+   * @return              A string where the SecurityLayer namespace prefixes
+   *                      and URIs are replaced by new ones.
+   */
+  public static String changeSLVersion(String s, String slPrefixOld, String slPrefixNew, String slNSUriOld, String slNSUriNew) {
+    String retString = replaceAll(s, slPrefixOld, slPrefixNew);
+    retString = replaceAll(retString, slNSUriOld, slNSUriNew);
+    return retString ;
+  }
+  
+  /**
+   * Removes the XML declaration from an XML expression.
+   * 
+   * @param xmlString XML expression as String
+   * 
+   * @return XML expression, XML declaration removed
+   */
+  public static String removeXMLDeclaration(String xmlString) {
+    if (xmlString!=null && xmlString.startsWith("<?xml")) {
+      int firstElement = xmlString.indexOf("<", 1);
+      return xmlString.substring(firstElement);
+    } else {
+      return xmlString;
+    }
+  }
+  
+  /**
+   * Checks if String is empty
+   * @param s String to be checked if empty
+   * @return True if String is empty, false otherwise
+   */
+  public static boolean isEmpty(String s) {
+     if (s == null || s.length() == 0)
+        return true;
+     else
+        return false;
+     
+  }
+  
+  
+}