Language Tags and Locale Identifiers for the World Wide Webdescribes the best practices for identifying or selecting the language of content as well as the the locale preferences used to process or display data values and other information on the Web. It describes how document formats, specifications, and implementations should handle language tags, as well as extensions to language tags that describe the cultural or linguistic preferences referred to in internationalization as a “locale”.
Changes in this update include the following: All references to RFC3066bis were updated to BCP 47 or to RFC5646 or RFC 4647 as appropriate.References to HTML were changed to point to HTML5. Imported and rewrote the text formerly containing in Web Services Internationalization Usage Scenarios defining internationalization, locale, and other important terms. Modified and reorganized the other sections of this document. Moved the Web services materials to an appendix.