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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, June 17, 2009, 10:00 am - 12:00 p.m. EDT (UTC-4):
  • Call-in U.S. free number: 888-391-7042
  • Call-in toll number: 517-308-9486
  • Passcode: 18484

Asynchronous participation will be open from 12:00 pm EDT on Wednesday, June 17, 2009 until 5:00 pm EDT on Wednesday, July 1, 2009.

Additional information:

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

  2. FAQs (February 2007)

  3. Documentation, Draft schema, and changes for UnitsML, Ver. 0.9.18. (January 2009)

  4. Guidelines for the Use of Units Markup Language - Draft version 0.4.2

  5. Naming and Design Rules - Draft version 0.4.3 & Rules only

  6. Overview slides used in the 1st OASIS TC Meeting, July 12, 2006 (PDF 470 kB)

  7. UnitsDB Entity Relationship Model

  8. UnitsML presentation (Jan 2003; PPT 450 kB)

For further information, contact Bob Dragoset.


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

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