Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

APDE Demonstration System Architecture



Steve Clark, Allison Barnard Feeney


The National PDES Testbed project at NIST is focused on the development and implementation of the emerging international Standard for the Exchange of Product Model data (STEP). One sub-project within the Testbed is the effort to establish an Application Protocol Development Environment (APDE). This report describes the architecture of a prototype system which will be built at NIST to demonstrate some of the features needed in an APDE and some approaches to providing these features. This demonstration system will focus on a specific step in the AP development process, namely ARM interpretation. The functionality demonstrated is based on specifications documented in an earlier report.
NIST Interagency/Internal Report (NISTIR) - 5318
Report Number


APDE, PDES, product model data, protocol development, STEP


Clark, S. and Barnard Feeney, A. (1993), APDE Demonstration System Architecture, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online],, (Accessed April 16, 2024)
Created July 31, 1993, Updated October 12, 2021