'宣言
Public Interface IRootHierarchicalPointDataModel Inherits IBaseHierarchicalPointDataModel, IDataModel, GrapeCity.DataVisualization.Chart.IGrouping(Of DataValueType), IPointDataModel, IQueryInterface, GrapeCity.DataVisualization.Chart.ITreeNode(Of IBaseHierarchicalPointDataModel)
public interface IRootHierarchicalPointDataModel : IBaseHierarchicalPointDataModel, IDataModel, GrapeCity.DataVisualization.Chart.IGrouping<DataValueType>, IPointDataModel, IQueryInterface, GrapeCity.DataVisualization.Chart.ITreeNode<IBaseHierarchicalPointDataModel>