Is there a distinction between values and references to values? Is there a concept of compound values and their components? Is there anything on referential con

Is there a distinction between values and references to values? Is there a concept of compound values and their components? Is there anything on referential constraints definition? Is it possible to indicate that an item cannot be removed if it is still used in another item? Or that if an item is removed other items that depend on it, should also be removed? See for some explaination about what I mean: https://github.com/FransFaase/DataLang https://github.com/FransFaase/DataLang