This tutorial was updated to incorporate changes made to BCP 47 by the recent publication of RFC 5646. Changes to BCP 47 include the introduction of extended language subtags, and the addition of ISO 639-3 language subtags, bringing the total number of subtags in the registry to almost 8,000.

Translators should consider retranslating the whole tutorial. [search keys: article-language-tags]

This document is being published as a Working Group note in order to capture and preserve historical information. It contains requirements elaborated in 1998 for aspects of the character model for W3C specifications. It was developed and extensively reviewed by the Internationalization Working Group, but never progressed beyond Working Draft status. For this publication, the wording of the 1998 version remains unchanged (except for correction of a small number of typographic errors), but the links to references have been updated prior to this publication.

The document describes requirements for some important aspects of the character model for W3C specifications. The two aspects discussed are string identity matching and string indexing.

Editor: Martin Dürst. [search keys: tr-charreq]

FAQ-based article: If I'm unable to use markup to correctly order bidirectional text, what can I do?

By Richard Ishida, W3C. [search key: qa-bidi-unicode-controls]

Article: This article provides guidelines for the migration of software and data to Unicode. It covers planning the migration, and design and implementation of Unicode-enabled software. A basic understanding of Unicode and the principles of character encoding is assumed.

By Norbert Lindenberg & Addison Phillips, Yahoo. [search key: article-unicode-migration]

FAQ-based article: What is a character encoding, and why should I care?

This article is aimed at content authors, users, and anyone who is unsure about what a character encoding is, and wants a brief summary of how it affects them.

By Richard Ishida, W3C. [search key: qa-what-is-encoding]