NearestNeighborAlgebra 3 0 TemporalAlgebra RTreeAlgebra BTreeAlgebra TBTreeAlgebra RelationAlgebra SpatialAlgebra RectangleAlgebra DateTimeAlgebra TupleIdentifierAlgebra makefile NearestNeighborAlgebra.cpp NearestNeighborAlgebra.h BBTree.h CoverInterval.h nntest NearestNeighborAlgebra.spec NearestNeighbor.examples copyright.txt