8. Conclusions

It follows from above that data structure presented is able to store all information we need. It is for example possible to include more types of representation into the list in one cell, e.g. several height fields with different resolutions, both structured grid and its approximation with height field, etc. Everything depends on the implementation of tools for work with this structure. Next advance of the structure is its openess for including other information---it is needed only to add new type of list item; if a particular tools implementation cannot work with this type of item, it can just ignore it (so it is not necessary to change tools implementation by adding new feature).

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