ULI Project

The Unicode Localization Interoperability Technical Committee (ULI) works to ensure interoperable data interchange of critical localization-related assets, including:
  • Translation memory: A translation memory system stores words or phrases that have been tanslated previously. The use of translation memory ensures the consistency of translated content, accelerates the speed of translation, and also reduces the cost of repeated translation requests.
  • Segmentation rules: Segmentation rules define the way to segment text for translation or other text processing. The rules are used in conjunction with translation memory to create memory segments or identify matches within the source content of existing translation memories.
  • Translation source strings and their translations: Translation source is natural language text, typically with markup, that will be translated into another language. The translated strings are the results of translating the source strings while preserving the markup.

Whether a translation request is completed by human or machine, these assets play a vital role in the overall translation process. Interoperable interchange of these assets reduces errors, lowers costs, and improves throughput.

Charter and Scope

Please see ULI Charter page for more details.

Profiles of Use

The primary focus of the ULI Technical Committee will be to establish profiles of use for XLIFF, TMX, and SRX. The committee will develop and publish specifications that document specific usage conventions that can be shared for interoperability. This will improve data exchange through more consistent implementations and enhance the usefulness of these three standards.

Extensions to Established Standards

The secondary focus of the ULI Technical Committee will be to gather requirements for future extensions to XLIFF, TMX, and SRX. The ULI committee will develop reference implementations, as necessary, to demonstrate the feasibility of any proposals for future standardization.

Publicly Available Specifications

These documents are archived for historical purposes and do not specify a Unicode standard. These documents are already publicly available online elsewhere, are are only hosted on the Unicode ULI site as a convenience.


For information on how to join the ULI and get involved in its work, contact the Unicode Consortium with the contact form and ask about the ULI.

To become a voting participant in the work of the ULI committee, join Unicode in one of the three voting categories of membership: Full, Institutional, or Supporting. Learn about the benefits of joining.

The officers of the ULI will establish the meeting schedule. Meetings are to be conducted by conference call to enable broad participation by members of the industry.

Email Discussions

Outside of formal meetings, much of the technical work of the Unicode Localization Interoperability Technical Committee is conducted in email discussions held on the distribution list of ULI members (ulitc). Informal discussions of technical issues are also held on public Unicode email distribution lists.


The current Technical Committee Officers are:

  • Chair: Steven R Loomis (IBM)
  • Vice Chair: Uwe Stahlschmidt (Microsoft)
  • Secretary: Yoshito Umaoka (IBM)
 Hot News!
  • Publicly Available Specifications The ULI project now hosts documents which are archived for historical purposes and do not specify a Unicode standard. They are located at http://www.unicode.org/uli/pas/
    Posted Oct 27, 2015, 11:33 PM by Steven R. Loomis
  • ULI Segment Exceptions Posted in SVN and Demo Updated The latest ULI segmentation exception has been posted in SVN: http://unicode.org/uli/trac/browser/trunk/abbrs including: Reference to CLDR date/month and other necessary symbolsAvailable in ...
    Posted Jan 18, 2013, 2:26 PM by Steven R. Loomis
  • New Mailing List: uli-users A public mailing list has been created for discussion of unicode, localization, and interoperability as on Unicode.org. This mailing list is intended for broad-based conversations on the topics ...
    Posted Mar 27, 2012, 7:54 AM by Kevin Lenzo
  • LocalizationWorld Preconference Day on Unicode in Paris Jun 4 2012 We are pleased to announce that Localization World is organizing a one-day Unicode workshop on Unicode, including an introduction with Richard Ishida and three additional sessions. This will take ...
    Posted Feb 16, 2012, 7:15 PM by Helena Shih
  • ULI TC Kick-off The Unicode Consortium recently announced a new technical committee focusing on standards for data interoperability of critical localization-related assets, such as language segmentation, translation source strings, translated strings, and ...
    Posted May 23, 2011, 9:53 AM by Helena Shih
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