1990-1992. ViSual dataflow language, token-baSed with hierarchical, recurSive and iterative conStructS. VerSion: IDF with extenSionS for image proceSSing. ["IDF: A Graphical Data Flow Programming Language for Image ProceSSing and Computer ViSion", Neil Hunt, Proc IEEE Conf on SyStemS Man & CyberneticS, IEEE, Nov 1990. Available from Iconicon S.com>].