Network Working Group D. Cridland Internet-Draft Isode Limited Intended status: Standards Track July 6, 2009 Expires: January 7, 2010 The Internet Assigned Number Authority (IANA) Application Configurations Access Protocol (ACAP) Vendor Subtrees Registry draft-cridland-acap-vendor-registry-00 Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on January 7, 2010. Copyright Notice Copyright (c) 2009 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Abstract The original ACAP specification included a vendor registry now used in other protocols. This document updates the description of this Cridland Expires January 7, 2010 [Page 1] Internet-Draft ACAP Vendor Subtrees Registry July 2009 registry, removing the need for a direct normative reference to ACAP, and removing ambiguity. Table of Contents 1. Conventions used in this document . . . . . . . . . . . . . . . 3 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. The Vendor Subtree Registry . . . . . . . . . . . . . . . . . . 3 3.1. Internationalization . . . . . . . . . . . . . . . . . . . 3 3.2. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . 4 3.3. Examples . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.4. Changes from RFC 2244 . . . . . . . . . . . . . . . . . . . 4 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 5 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 5 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6 7.1. Normative References . . . . . . . . . . . . . . . . . . . 6 7.2. Informative References . . . . . . . . . . . . . . . . . . 6 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 6 Cridland Expires January 7, 2010 [Page 2] Internet-Draft ACAP Vendor Subtrees Registry July 2009 1. Conventions used in this document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [KEYWORDS]. Formal Syntax are to be considered normative, and are specified using [ABNF]. Where a formal syntax and the prose are in conflict, the formal syntax takes precedence. 2. Introduction The [ACAP] specification includes the specification and creation of the ACAP Vendor Registry, and this registry has subsequently been reused by several specifications, including both [ANNOTATE] and [METADATA], and is proving to be a useful mechanism for namespacing various names to within a specific vendor's scope. This document merely updates the registry to reduce ambiguity in the original specification, and dissociates it from the original document in all but name, allowing easier referencing. It replaces section 7.4 and portions of section 4, particularly 4.3, of [ACAP]. 3. The Vendor Subtree Registry A Vendor Token is a UTF-8 string beginning with "vendor.", and followed by the name of the company or product. This name MUST NOT contain any slash character, period, or the percent and asterisk characters typically used as wildcards. Following this may be names, separated from the Vendor Token by a period, which need not be registered, thus forming a complete Vendor Name. 3.1. Internationalization Vendor Tokens are able to contain any valid Unicode codepoint, encoded as UTF-8, except the special characters. Since the publication of [ACAP], however, concerns have been raised on the handling and comparison of full Unicode strings, and therefore this specification restricts the current registrations to the ASCII subset of UTF-8. Furthermore, characters such as control characters, whitespace, and quotes are likely to be confusing and have been similarly restricted. Cridland Expires January 7, 2010 [Page 3] Internet-Draft ACAP Vendor Subtrees Registry July 2009 Therefore, this document allows only ASCII letters, digits, the hyphen, and space to be used. 3.2. Formal Syntax This syntax draws upon productions found within [ABNF] and [UTF-8]. Productions replace those in section 4.3 of [ACAP]. vendor-name = vendor-token ["." name-component] name-component = *(name-char / UTF8-2 / UTF8-3 / UTF8-4) name-char = %x01-24 / %x26-29 / %x2B-2D / %x30-7F ;; ASCII-range characters not including ".", ;; "/", "%", or "*". vendor-token = "vendor." vendor-tag vendor-tag = iana-vendor-tag / possible-vendor-tag iana-vendor-tag = 1*(ALPHA / DIGIT / SP) ;; This production represents ;; allowed forms for current registrations. possible-vendor-tag = name-component ;; This production represents ;; what applications and specifications may encounter. 3.3. Examples A company Example Ltd might register the Subtree "vendor.example". This means it may use "vendor.example", or any name at all beginning "vendor.example.", such as "vendor.example.product". These names might be used in several protocols, and are reserved in all the relevant protocols, so "vendor.example" might be an ACAP dataset class name, and "/vendor/vendor.example" might be a tree of IMAP ANNOTATE entries. Example Ltd is free to use either "vendor.example", and group specific products under it using the relevant protocol's hierarchy - perhaps "/shared/vendor/vendor.example/product", or using more specific names, such as "/shared/vendor/vendor.example.product". 3.4. Changes from RFC 2244 This non-normative section details changes from RFC 2244's original specification of the registry. Cridland Expires January 7, 2010 [Page 4] Internet-Draft ACAP Vendor Subtrees Registry July 2009 UTF-8 names are restricted to ASCII Clarifications that "vendor." means "vendor.company name" or "vendor.product name" - "vendor.company/ product" is and always has been illegal. Made "vendor.company" a name in its own right - RFC 2244 only refers to a prefix of "vendor.company.". Added example registration, in line with [EXAMPLES]. 4. IANA Considerations This specification updates the IANA registry named the ACAP Vendor Subtrees Registry. Vendors may reserve a portion of the ACAP namespace, which is also used as the namespace for several other protocols, for private use. Vendor Names are reserved for use by that company or product, wherever used, once registered. Registration is on a first come, first served basis. Whenever possible, private attributes and classes should be eschewed in favour of improving interoperable protocols. Vendors may only use names conforming to iana-vendor-tag at the current time, future revisions of this specification may change this. To: iana@iana.org Subject Registration of ACAP vendor subtree Private Prefix: vendor.name Person and email address to contact for further information: (company names and addresses should be included where appropriate) 5. Security Considerations There are no known security issues with this registry. Individual protocols using vendor subtree names may have security issues, and the introduction of unicode has in itself security implications - the restriction of this is thought to mitigate these. 6. Acknowledgements Thanks must go to Chris Newman, John Myers, and the other designers of ACAP for the initial creation of the registry. Thanks also to Alexey Melnikov for advice on this revision. Cridland Expires January 7, 2010 [Page 5] Internet-Draft ACAP Vendor Subtrees Registry July 2009 7. References 7.1. Normative References [ABNF] Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", STD 68, RFC 5234, January 2008. [KEYWORDS] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [UTF-8] Yergeau, F., "UTF-8, a transformation format of ISO 10646", STD 63, RFC 3629, November 2003. 7.2. Informative References [ACAP] Newman, C. and J. Myers, "ACAP -- Application Configuration Access Protocol", RFC 2244, November 1997. [ANNOTATE] Daboo, C. and R. Gellens, "Internet Message Access Protocol - ANNOTATE Extension", RFC 5257, June 2008. [EXAMPLES] Eastlake, D. and A. Panitz, "Reserved Top Level DNS Names", BCP 32, RFC 2606, June 1999. [METADATA] Daboo, C., "The IMAP METADATA Extension", RFC 5464, February 2009. Author's Address Dave Cridland Isode Limited 5 Castle Business Village 36, Station Road Hampton, Middlesex TW12 2BX GB Email: dave.cridland@isode.com Cridland Expires January 7, 2010 [Page 6]