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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, January 27, 2010, 10:00 am - 12:00 p.m. EST (UTC-5):
  • Call-in U.S. free number: 877-917-6907
  • Call-in toll number: 517-308-9144
  • Passcode: 62163

Asynchronous participation (1 week) will be open from 12:00 pm EST on Wed., Jan. 27, 2010 until 5:00 pm EST on Wed., Feb. 3, 2010.

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. (June 2009)
    [Lite Documentation and Schema]

  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)

  9. Sample tools for and usage of UnitsML

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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