- Data transformation (normalization, reduction ....) that leads to the same intrinsic-data, should be managed at construction level of the data itself.
- We can think of data as defined by some collection of selectors and constructors, together with specified conditions that these procedures must fulfil in order to be a valid representation (this representation could be either a direct-representation or a procedural-representation)
- Procedural representation of data is often called message passing style.
- A means of combination should satisfy closure property (when applying the operation to elements in the set produces an element that is again an element of the set)
- map and filters: could be seen as a framework (sub-language) defined as:
- Primitive: sequences (conventional interface).
- Means of combinations: filters, maps, accumulates ..
- Means of abstractions: inherited from the language which map/filters is built on top of it
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