const struct variable * psppire_var_view_get_variable (PsppireVarView *vv, gint column, GtkTreeIter *iter);
const struct variable * psppire_var_view_get_var_from_model (GtkTreeModel *, gint column, GtkTreeIter *iter);
const struct variable * psppire_var_view_get_variable (PsppireVarView *vv, gint column, GtkTreeIter *iter);
const struct variable * psppire_var_view_get_var_from_model (GtkTreeModel *, gint column, GtkTreeIter *iter);