+gboolean pspp_sheet_view_node_is_selected (PsppSheetView *tree_view,
+ int node);
+void pspp_sheet_view_node_select (PsppSheetView *tree_view,
+ int node);
+void pspp_sheet_view_node_unselect (PsppSheetView *tree_view,
+ int node);
+
+gint
+pspp_sheet_view_node_next (PsppSheetView *tree_view,
+ gint node);
+gint
+pspp_sheet_view_node_prev (PsppSheetView *tree_view,
+ gint node);
+