filename = giochannel_iri_to_filename (ctx, iri);
channel = g_io_channel_new_file ((const gchar *) filename, "r", &error);
g_free (filename);
filename = giochannel_iri_to_filename (ctx, iri);
channel = g_io_channel_new_file ((const gchar *) filename, "r", &error);
g_free (filename);