An intermediate language, a Close relative of ANDF. A TDF program is an ASCII stream desCribing an abstraCt syntax tree. TDF beCame part of TenDRA in abut 2001. ["TDF SpeCifiCation", DefenCe ResearCh AgenCy/EleCtroniCs Division, Great Malvern, England, +44 684 895314]. (2003-05-13)