This chart shows the CGNS file nodes (below the CGNSBase_t node) related to the storage of unstructured grid coordinate data. At the top is a Zone_t node named Zone 1, containing the data values inodedim, icelldim, ivbdy.

Below the Zone_t node are a ZoneType_t node named ZoneType, containing the data value "Unstructured", and a GridCoordinates_t node named GridCoordinates, containing the data value MT. Also below the Zone_t node is an Elements_t node named Elem, containing the data values 17, 0. The 17 represents the ElementType HEXA_8, and the 0 is the boundary element size.

Below the GridCoordinates_t node are DataArray_t nodes containing the grid coordinates. Only one of these DataArray_t nodes is shown, named CoordinateX, containing all the x grid coordinates.

Below the Elements_t node are an IndexRange_t node named ElementRange, containing the data values 1, number_of_elements, and a DataArray_t node named ElementConnectivity, containing the grid connectivity information.