code: public ValidationResult append(
  			Collection<ValidationMessage<Origin>> messages) {
  		if (messages == null) {
  			return this;
  		}
  		for (ValidationMessage<Origin> message : messages) {
  			addMessage(message);
  		}
  		return this;
  	}
docs: Appends a collection of validation message to the result.
  
  @param messages a collection of validation messages to be added
  @return a reference to this object