public void addAttributeValue(Principal principal,Guid guid,String name,String value) throws UMSException {
  modifyAttributeValue(ModificationType.ADD,principal,guid,name,value);
}

public void addAttributeValue ( Principal principal , Guid guid , String name , String value ) throws UMSException { modifyAttributeValue ( ModificationType . ADD , principal , guid , name , value ) ; }
adds value for an attribute and saves the change in the database .
