Geophile interacts with spatial objects through another
abstraction. The spatial object abstraction contains just one function
which compares the object to a box. The object may contain the box,
the object and box may overlap, or the object and box may be disjoint.
Geophile analyzes each spatial object using the comparison function,
producing a set of integers which represent the spatial object. These
integers serve as keys to the index abstraction.
implementations.
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