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.

The NIST PDES Toolkit: Technical Fundamentals



Steve Clark, Donald E. Libes


The Product Data Exchange using STEP (PDES) is an emerging standard for the exchange of product information among various manufacturing applications. A software toolkit for manipulating PDES data has been developed at the National PDES Testbed at NIST. A technical overview of this PDES Toolkit is provided. Fundamental software libraries are described, and techniques for creating applications based on the Toolkit are discussed. This document has been revised to reflect modifications in the implementation of Fed-X software to support the changes in the Express language.
NIST Interagency/Internal Report (NISTIR) - 4815
Report Number


Express, Express language, manufacturing, manufacturing applications, PDES, product data exchange, STEP


Clark, S. and Libes, D. (1992), The NIST PDES Toolkit: Technical Fundamentals, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online],, (Accessed June 16, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created April 30, 1992, Updated October 12, 2021