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Welcome to the Units of Functionality Repository! This repository contains all of the information in the Units of Functionality clause (4.1) for STEP application protocols of International Standard (IS), Final Draft International Standard (FDIS), or Draft International Standard (DIS) status. The following information is available:
The repository also includes the following implicit information, derivable from clause 4.1 but not stated explicitly:
Using the forms below, you may browse the repository or search for a particular unit of functionality or application object.
To learn more about the role played by units of functionality in the STEP application protocol development process, look at the Guidelines for the development and approval of STEP application protocols. This document is in PDF format and may be read using Adobe's free Acrobat Reader software. Acrobat Reader may also be used to view PDF graphics in the UoF Repository.
Please contact the NIST Application Protocol Development Environment project team if you have any feedback or comments regarding this service.
The UoF Repository is generated from digital ASCII versions of STEP application protocol documents as follows:
Because most of the above procedure is automated (and the non-automated part is small), it is easy to re-generate the UoF Repository as needed when new application protocols become available or when existing application protocols advance in status.
The UoF Repository uses the same web gateway framework that was developed for NIST's Application Protocol Information Base, documented in the following paper:
A few new access functions were implemented to support UoFs, and additional CGI scripts were written to generate HTML pages from the query results.
In case you are wondering about the strange logo for the UoF Repository, it is supposed to be an "unidentified flying object" or "UFO" (an anagram of "UoF"). Suggestions for a new logo are welcome.
Written by Joshua Lubell
Last modified May 17, 1999