11.1.1 Topology

The primary organization of grids within RESQML is by the dimensionality and indexing of the grid cells. Fundamental classes are IJK (3 indices), column-layer (2 indices), and unstructured (1 index). This is an intrinsic characteristic which should be preserved on both export and import. Changes of indexing (swaps in IJK axis directions, IJK to column-layer, or column-layer to unstructured) are technically possible, but will sufficiently damage a round-trip workflow that such operations are considered to create a new grid, not to transfer an existing grid.