Returned in a read-only list from GeometryEngine.GetPredefinedCoordinateSystemList. A coordinate system list entry can have more than one level in a category. If there is more than one level in a category, categories are hierarchical. For example:
Two level category followed by the name of the coordinate system: Geographic Coordinate Systems/World/WGS 1984
Three level category followed by the name of the coordinate system: Geographic Coordinate Systems/Solar System/Venus/Venus 2000