public void addValue(String value){
  if (isNullSeperateMultipleValues()) {
    setValue(this.value + "\u0000" + value);
  }
 else {
    setValue(this.value + value);
  }
}

public void addValue ( String value ) { if ( isNullSeperateMultipleValues ( ) ) { setValue ( this . value + "" + value ) ; } else { setValue ( this . value + value ) ; } }
add an additional string to the current string value
