L2/00-269

Unicode Technical Reports

Unicode Technical Reports cover a wide range of topics related to the implementation or development of the Unicode Standard. These include but are not limited to:

normalizing Unicode text for comparison and storage
compressing Unicode text, for storage comparable to that of legacy encodings
collating (sorting) strings
linebreaking text
performing uppercase, lowercase, titlecase, and case folding operations
handling CRLF
designing regular expressions

Note:

Terms used in the Technical Reports may be found in the Unicode Glossary. Common questions about the subjects of the technical reports can be found in the Unicode Frequently-Asked Questions.

These reports are normatively referenced by a number of international standards and by a wide range of products.

Status

A Unicode Technical Report (UTR) may contain either informative material or normative specifications, or both. Each UTR may specify a base version of the Unicode Standard. In that case, conformance to the UTR requires conformance to that version of the
standard or higher.

There are two specially distinguished types of approved Unicode Technical Reports that are given more authoritative status by the Unicode Consortium.

A Unicode Standard Annex (UAX) forms an integral part of the Unicode Standard, carrying the same version number as the standard, but is published as a separate document. Note that conformance to a version of the Unicode Standard includes conformance to its Unicode Standard Annexes.

A Unicode Technical Standard (UTS) is an independent specification. Conformance to the Unicode Standard does not imply conformance to any UTS. Each UTS specifies a base version of the Unicode Standard.

As technical reports are developed, preliminary versions are posted for public review.

A Draft Unicode Technical Report (DUTR) has been approved by the Unicode Technical Committee for public review.

A Proposed Draft Unicode Technical Report (PDUTR) is in the earliest stages of review.

Publication of these draft versions does not imply endorsement by the Unicode Consortium. Both Draft and Proposed Draft Unicode Technical Reports are preliminary documents which may be updated, replaced, or superseded by other documents at any time. They are not stable specifications; it is inappropriate to cite them as other than works in progress:

Earlier technical reports may be incorporated into The Unicode Standard or superseded by newer Unicode technical reports. These are marked as Superseded. However, archival versions of all approved versions of all technical reports either are maintained on the Unicode web site or are available from the Unicode Consortium in paper copy upon request.

For more information about the approval process, see Technical Report Process.

Versioning

Uniform and persistent tracking numbers are used for all Unicode Technical Reports, even in the case when a Unicode Technical Report changes its status to a UAX or a UTS. This tracking number is incremented and a new URL is provided each time the file is altered. Each file has links to the previous approved version of the report and to the latest approved version of the report, allowing readers to find and cite particular versions.

Note:

Because tracking numbers used
whole numbers in the past, rather than a major.minor version syntax, some
UTRs have rather large version numbers. Many of the tracking number
changes, however, may reflect rather minor editorial changes to the
documents, rather than substantive changes to their contents.

For a UAX, the version number is of the form “Unicode 3.0.1” to reflect the fact that it is now part of a given version of the Unicode Standard.
For other UTRs (including UTSs), the version number of the report is identical to the tracking number.

For more information about citing versions of Unicode Technical Reports, see Versions of the Unicode Standard.

Notes from Editorial Meeting

This document has been reviewed by Unicode members and other interested parties, and has been approved by the Unicode Technical Committee as a Unicode Standard Annex. It is a stable document and may be used as reference material or cited as a normative reference from another document.

A Unicode Standard Annex (UAX) forms an integral part of the Unicode Standard, carrying the same version number, but is published as a separate document. Note that conformance to a version of the Unicode Standard includes conformance to its Unicode Standard Annexes.

A list of current Unicode Technical Reports is found on http://www.unicode.org/unicode/reports/. For more information about versions of the Unicode Standard, see http://www.unicode.org/unicode/standard/versions/ .

Please mail corrigenda and other comments to the author(s).

-----------------------------

This document has been reviewed by Unicode members and other interested parties, and has been approved by the Unicode Technical Committee as a Unicode Technical Standard. It is a stable document and may be used as reference material or cited as a normative reference from another document.

A Unicode Technical Standard (UTS) is an independent specification. Conformance to the Unicode Standard does not imply conformance to any UTS. Each UTS specifies a base version of the Unicode Standard. Conformance to the UTS requires conformance to that version or higher.

Please mail corrigenda and other comments to the author(s).

==================

This document has been reviewed by Unicode members and other interested parties, and has been approved by the Unicode Technical Committee as a Unicode Technical Report. It is a stable document and may be used as reference material or cited as a normative reference from another document.

Please mail corrigenda and other comments to the author(s).

==================

to add to header: three versions

Version: 18.0 // all (UAX - Unicode 3.0.1)

Authors Mark Davis ([email protected] <mailto:[email protected]>), Martin Dürst ([email protected] <mailto:[email protected]>)

Date 1999-11-11

This Version <http://www.unicode.org/unicode/reports/tr15/tr15-18.html>

Previous Version <http://www.unicode.org/unicode/reports/tr15/tr15-17.html>

Latest Version <http://www.unicode.org/unicode/reports/tr15>

Base Version: Unicode 2.1.9 // all but UAX, optional

Tracking Number (old Revision): 21 // all

==================

Truths

once we get to UTS or UAX, no more draft or proposed -- may have beta versions for public review.

===============

This document has been approved by the Unicode Technical Committee for public review as a Draft Unicode Technical Report. Publication does not imply endorsement by the Unicode Consortium. This is a draft document which may be updated, replaced, or superseded by other documents at any time. This is not a stable document; it is inappropriate to cite this document as other than a work in progress.

===============

This document has been submitted to the Unicode Technical Committee as a Proposed Draft Unicode Technical Report. Publication does not imply endorsement by the Unicode Consortium. This is a draft document which may be updated, replaced, or superseded by other documents at any time. This is not a stable document; it is inappropriate to cite this document as other than a work in progress.