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Isn't this encapsulation?
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Yes, it is :-)

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Do you know if someone is working on formal ways of doing this? Feeling and intuition get in your way quickly...

Thanks for the comment, things are more clear now. I still have to read the second post :-)
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I really don't know if someone is working on formal ways, but I'll look into it and get back to you.

Thank you, for all the suggestions and comments about this article! Hope to have more comments from you on the next article.