PsppireVarView *var_view = PSPPIRE_VAR_VIEW (scd->variables);
gint n_vars = psppire_var_view_append_names (var_view, 0, string);
PsppireVarView *var_view = PSPPIRE_VAR_VIEW (scd->variables);
gint n_vars = psppire_var_view_append_names (var_view, 0, string);