code: public static String unescapeValue(String escapedValue)
      {
          // Check that the escaped value does not contain reserved characters
          checkEscaped(escapedValue, Value.reservedChars, false);
          // Unescape the value
          return unescape(escapedValue, Value.reservedChars);
      }
docs: Unescapes the given escaped value string following RFC 2608, 5.0.
  <br />
  For example, the string value <code>\3cA\3e</code> will be converted into the string
  <code>&lt;A&gt;</code>.
  
  @param escapedValue the value string to unescape
  @return the unescaped value string
  @see #escapeValue(String)