TY - RPRT TI - Developing application protocols (Aps) using the architecture and methods of STEP (Standard for the Exchange of Product data): fundamentals of the STEP methodology AU - Danner, William F PY - 1997 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 5972 DO - 10.6028/NIST.IR.5972 ER -