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### Aspects

There are two major aspects or views of icl containers. The first and predominant aspect is called fundamental. The second and minor aspect is called segmental.

| Fundamental | Segmental
--- | --- | ---
Abstraction level | more abstract | less abstract
| sequence of elements is irrelevant | sequence of elements is relevant
| iterator independent | iterator dependent
Informs about | membership of elements | sequence of intervals (segmentation)
Equality | equality of elements | equality of segments
Practical | interval_sets(maps) can be used as sets(maps) of elements(element value pairs) | Segmentation information is available. See e.g. Time grids for months and weeks

On the fundamental aspect

- an `interval` implements a set of elements partially.
- an `interval_set` implements a set of elements.
- an `interval_map` implements a map of element value pairs.

On the segmental aspect

- an `interval_set` implements a set of intervals.
- an `interval_map` implements a map of interval value pairs.