public Builder tagIsNot(Class<?>... tags){
  verifyNotNull(tags);
  expressions.add(new Not(new EventFilterExpression.TagIs(tags)));
  return this;
}

public Builder tagIsNot ( Class < ? > ... tags ) { verifyNotNull ( tags ) ; expressions . add ( new Not ( new EventFilterExpression . TagIs ( tags ) ) ) ; return this ; }
add a filter for all sources sections that declare not one of the given string tags .
