How to assign a custom algorithm for classification

[#1]

I'm very interested in apache atlas and learning architecture. So everything seems clear but there are some questions. First question which the most important is "How to assign a custom algorithm for classification". I can give an example:

There is a classification EXPIRES_ON, it means that when we assign on something this classification it will check entities and remove it when it's needed. So the question is how to override algorithm of deleting/ziping entities? I don't know how exactly works EXPIRES_ON deletion algorithm but anyway I would like to override it. Is it possible to do in Apache Atlas?