gboolean a_babel_convert_from_shellcommand ( VikTrwLayer *vt, const char *input_cmd, const char *input_file_type, BabelStatusFunc cb, gpointer user_data );
gboolean a_babel_convert_from_url ( VikTrwLayer *vt, const char *url, const char *input_type, BabelStatusFunc cb, gpointer user_data );
gboolean a_babel_convert_from_shellcommand ( VikTrwLayer *vt, const char *input_cmd, const char *input_file_type, BabelStatusFunc cb, gpointer user_data );
gboolean a_babel_convert_from_url ( VikTrwLayer *vt, const char *url, const char *input_type, BabelStatusFunc cb, gpointer user_data );