gboolean psppire_var_view_get_iter_first (PsppireVarView *vv, GtkTreeIter *iter);
gboolean psppire_var_view_get_iter_next (PsppireVarView *vv, GtkTreeIter *iter);
gboolean psppire_var_view_get_iter_first (PsppireVarView *vv, GtkTreeIter *iter);
gboolean psppire_var_view_get_iter_next (PsppireVarView *vv, GtkTreeIter *iter);