This chart illustrates the file structure for a typical CGNS file.
Below the root node are the CGNSLibraryVersion_t and CGNSBase_t nodes. Below are two Zone_t nodes, one named Zone 1 and the other Zone 2, a ConvergenceHistory_t node, and a ReferenceState_t node. Below the Zone 2 node are GridCoordinates_t, ZoneBC_t, FlowSolution_t, and ZoneGridConnectivity_t nodes. There are also child nodes below the Zone 1 node, not shown in detail.