PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols
RFC 7564, “PRECIS Framework: Preparation, Enforcement, and Comparison of Internationalized Strings in Application Protocols”, is a Proposed Standard document published in May 2015 by P. Saint-Andre, M. Blanchet. It obsoletes RFC 3454. It has been obsoleted by RFC 8264 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
Application protocols using Unicode characters in protocol strings need to properly handle such strings in order to enforce internationalization rules for strings placed in various protocol slots (such as addresses and identifiers) and to perform valid comparison operations (e.g., for purposes of authentication or authorization). This document defines a framework enabling application protocols to perform the preparation, enforcement, and comparison of internationalized strings ("PRECIS") in a way that depends on the properties of Unicode characters and thus is agile with respect to versions of Unicode. As a result, this framework provides a more sustainable approach to the handling of internationalized strings than the previous framework, known as Stringprep (RFC 3454). This document obsoletes RFC 3454.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 7564 is hosted at rfc-editor.org. Available in TXT,HTML.
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