+gboolean psppire_var_view_get_iter_first (PsppireVarView *vv, GtkTreeIter *iter);
+
+gboolean psppire_var_view_get_iter_next (PsppireVarView *vv, GtkTreeIter *iter);
+
+const struct variable * psppire_var_view_get_variable (PsppireVarView *vv, gint column, GtkTreeIter *iter);
+
+