yelp-error
#define YELP_ERROR enum YelpError; GError * yelp_error_copy (GError *error); const gchar * yelp_error_get_title (GError *error);
GError *error
#define YELP_ERROR g_quark_from_static_string ("yelp-error")
typedef enum { YELP_ERROR_NOT_FOUND, YELP_ERROR_CANT_READ, YELP_ERROR_PROCESSING, YELP_ERROR_UNKNOWN } YelpError;
GError * yelp_error_copy (GError *error);
const gchar * yelp_error_get_title (GError *error);