Divisions / Research Areas

[skip navigation] NIST Physical Measurement Laboratory home page Research home page go to NIST home page NIST Physical Measurement Laboratory home page Products and Services Physical Reference Data Research Areas / Divisions Contact us Search the Physical Measurement Laboratory webspace

Units Markup Language (UnitsML)

UnitsML is a project underway at the National Institute of Standards and Technology (NIST) to develop a schema for encoding scientific units of measure in XML. Furthermore, a database (UnitsDB) containing extensive information about scientific units is under development.

We have initiated an OASIS Technical Committee to address any needed changes in the schema and publish a final recommendation.
OASIS TC meeting — Wednesday, December 14, 2011, 10:00 am ET (asynchronous only)

Asynchronous participation (2 weeks) will be open from 10:00 am ET on Wed., December 14, 2011 until 5:00 pm ET on Wed., December 28, 2011.

Additional information:

  1. Two-page Description (May 2006; PDF 173 kB)

  2. FAQs (February 2007)

  3. UnitsML Schema Information:
    Documentation, CSD schema, and changes for UnitsML, Ver. 1.0-csd04. (December 2011)
    [Lite Documentation and Schema (0.9.18)]
    1. Example of concise documentation generated with a style sheet.
  4. Guidelines for the Use of Units Markup Language: PDF | ODT

  5. Naming and Design Rules - Version 1.0 & Rules only

  6. UnitsML Presentations:
    1. SCC20 - TII/TAD Working Group Meeting (September 11, 2011; PPT | PDF)
    2. Overview slides used in the 1st OASIS TC Meeting (July 12, 2006; PDF 470 kB)
    3. Sixth Open Forum on Metadata Registries (Jan 2003; PPT 450 kB)

  7. "Improving Interoperability by Incorporating UnitsML into Markup Languages" (Jan-Feb 2010; PDF 1.2 MB)

  8. UnitsDB Entity Relationship Model

  9. Sample tools for and usage of UnitsML

This project is supported in part by NIST's Systems Integration for Manufacturing Applications (SIMA) Program.

Obtain free PDF & PPT viewers.
Physical Measurement Laboratory home page

NIST home page

Privacy Policy | Security Notice | Accessibility Statement
Disclaimer / FOIA

NIST is an agency of the U.S. Department of Commerce.

Online: May 2003  -   Last update: December 2011

Poster presented at the 2006 OASIS Conference: Meaning of Interoperability

For further information, contact Peter Linstrom.
General NIST inquiries:
Public Inquiries Unit:
(301) 975-NIST (6478)
TTY (301) 975-8295