interface ICellModel {
  type: string;
	inputAreaId: string;
  outputAreaId: string;
}

interface IInputAreaModel {
  source: string;
}

interface IOutputAreaModel {
  mimeBundleIds: string[];
}

interface IMimeBundle { }

interface INotebookModel {
	// array of cell ids
	cells: string[];

	// mapping of cell id to cell
	cellsById: { [id: string]: ICellModel };

  inputAreaModelsById: { [id: string]: IInputAreaModel }

  outputAreaModelsById: { [id: string]: IOutputAreaModel };

  mimeBudlesById: { [id: string]: IMimeBundle };
}