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We show how such definitions can be used to automatically derive schema transformation operators for the higher-level data models.
Occasionally the desert cliffs and slopes come right down to the river, and it is difficult, if not impossible, to carry the higher-level canals past these obstructions.
Life can be made much easier by providing higher-level abstractions on top.
I assume this higher-level work will be in the same school where you have already taught some maths.