const char *var_get_short_name (const struct variable *, size_t idx);
void var_set_short_name (struct variable *, size_t, const char *);
void var_clear_short_names (struct variable *);
const char *var_get_short_name (const struct variable *, size_t idx);
void var_set_short_name (struct variable *, size_t, const char *);
void var_clear_short_names (struct variable *);