value_to_string
actual = value_to_string(val);
ret = value_to_string(&tvp->value, str);
extern char *value_to_string(const char *, void *);
string = value_to_string(string, value);
return ((char *)value_to_string(key, ns_get_value(key, printer)));
value_to_string(key, (void *)value), printer));