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Versions: 00 01 02 03 04 RFC 5017

IETF                                                    D. McWalter, Ed.
Internet-Draft                                       Data Connection Ltd
Proposed Status: Standards Track                          March 20, 2007
Expires: September 21, 2007


    MIB Textual Conventions for Uniform Resource Identifiers (URIs)
                     draft-mcwalter-uri-mib-04.txt

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
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   This Internet-Draft will expire on September 21, 2007.

Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   This MIB module defines textual conventions to represent STD 66
   Uniform Resource Identifiers (URIs).  The intent is that these
   textual conventions will be imported and used in MIB modules that
   would otherwise define their own representation(s).








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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  The Internet-Standard Management Framework . . . . . . . . . .  3
   4.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . .  6
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  6
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  7
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     8.1   Normative References . . . . . . . . . . . . . . . . . . .  7
     8.2   Informative References . . . . . . . . . . . . . . . . . .  7
       Author's Address . . . . . . . . . . . . . . . . . . . . . . .  8
       Intellectual Property and Copyright Statements . . . . . . . .  9





































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1.  Introduction

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   It defines textual conventions to represent STD 66 [RFC3986] URIs,
   which are further described by [RFC3305].

   Three textual conventions are defined, one of unrestricted length,
   and two of different restricted lengths.  Which length is appropriate
   will depend on tradeoffs made in particular MIB modules.  The purpose
   of providing standard restricted-length textual conventions is to
   improve compatibility between MIB modules that require restricted-
   length URIs.

   If a URI needs to be used as an index object, then the 'Uri' textual
   convention SHOULD be subtyped to a length appropriate for the OID of
   which it is part.  The description of the 'Uri' textual convention
   discusses this case.

2.  Terminology

   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 RFC 2119 [RFC2119].

3.  The Internet-Standard Management Framework

   For a detailed overview of the documents that describe the current
   Internet-Standard Management Framework, please refer to section 7 of
   RFC 3410 [RFC3410].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  MIB objects are generally
   accessed through the Simple Network Management Protocol (SNMP).
   Objects in the MIB are defined using the mechanisms defined in the
   Structure of Management Information (SMI).  This memo specifies a MIB
   module that is compliant to the SMIv2, which is described in STD 58,
   RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
   [RFC2580].

4.  Definitions

URI-TC-MIB DEFINITIONS ::= BEGIN

IMPORTS
    MODULE-IDENTITY, mib-2             FROM SNMPv2-SMI      -- [RFC2578]
    TEXTUAL-CONVENTION                 FROM SNMPv2-TC;      -- [RFC2579]




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uriTcMIB MODULE-IDENTITY
    LAST-UPDATED "200703200000Z" -- 20 March 2007
    ORGANIZATION "IETF Operations and Management (OPS) Area"
    CONTACT-INFO "EMail: ops-area@ietf.org
                  Home page: http://www.ops.ietf.org/"
    DESCRIPTION
            "This MIB module defines textual conventions for
            representing URIs, as defined by RFC 3986 STD 66."
    REVISION     "200703200000Z" -- 20 March 2007
    DESCRIPTION
           "Initial revision, published as RFC yyyy.

            Copyright (C) The IETF Trust (2007).  This version of this
            MIB module is part of RFC yyyy; see the RFC itself for full
            legal notices."
-- RFC Ed.: replace yyyy with actual RFC number & remove this note
    ::= { mib-2 XXX }
-- RFC Ed.: replace XXX with IANA-assigned number & remove this note

Uri ::= TEXTUAL-CONVENTION
   DISPLAY-HINT "1a"
   STATUS      current
   DESCRIPTION
            "A Uniform Resource Identifier (URI) as defined by STD 66.

            Objects using this textual convention MUST be in US-ASCII
            encoding, and MUST be normalized as described by RFC 3986
            sections 6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
            percent-encoding is removed, and all case-insensitive
            characters are set to lowercase except for hexadecimal
            digits, which are normalized to uppercase as described in
            section 6.2.2.1.

            The purpose of this normalization is to help provide unique
            URIs.  Note that this normalization is not sufficient to
            provide uniqueness.  Two URIs that are textually distinct
            after this normalization may still be equivalent.

            Objects using this textual convention MAY restrict the
            schemes that they permit.  For example, 'data:' and 'urn:'
            schemes might not be appropriate.

            A zero-length URI is not a valid URI.  This can be used to
            express 'URI absent' where required, for example when used
            as an index field.

            Where this textual convention is used for an index field,
            it MUST be subtyped to restrict its length.  There is an



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            absolute limit of 128 subids for an OID, and it is not
            efficient to have OIDs whose length approaches this limit."
   REFERENCE "RFC 3986 STD 66 and RFC 3305"
   SYNTAX      OCTET STRING

Uri255 ::= TEXTUAL-CONVENTION
   DISPLAY-HINT "255a"
   STATUS      current
   DESCRIPTION
            "A Uniform Resource Identifier (URI) as defined by STD 66.

            Objects using this textual convention MUST be in US-ASCII
            encoding, and MUST be normalized as described by RFC 3986
            sections 6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
            percent-encoding is removed, and all case-insensitive
            characters are set to lowercase except for hexadecimal
            digits, which are normalized to uppercase as described in
            section 6.2.2.1.

            The purpose of this normalization is to help provide unique
            URIs.  Note that this normalization is not sufficient to
            provide uniqueness.  Two URIs that are textually distinct
            after this normalization may still be equivalent.

            Objects using this textual convention MAY restrict the
            schemes that they permit.  For example, 'data:' and 'urn:'
            schemes might not be appropriate.

            A zero-length URI is not a valid URI.  This can be used to
            express 'URI absent' where required, for example when used
            as an index field.

            STD 66 URIs are of unlimited length.  Objects using this
            textual convention impose a length limit on the URIs that
            they can represent.  Where no length restriction is
            required, objects SHOULD use the 'Uri' textual convention
            instead.  Objects used as indices SHOULD subtype the 'Uri'
            textual convention."
   REFERENCE "RFC 3986 STD 66 and RFC 3305"
   SYNTAX      OCTET STRING (SIZE (0..255))

Uri1024 ::= TEXTUAL-CONVENTION
   DISPLAY-HINT "1024a"
   STATUS      current
   DESCRIPTION
            "A Uniform Resource Identifier (URI) as defined by STD 66.

            Objects using this textual convention MUST be in US-ASCII



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            encoding, and MUST be normalized as described by RFC 3986
            sections 6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
            percent-encoding is removed, and all case-insensitive
            characters are set to lowercase except for hexadecimal
            digits, which are normalized to uppercase as described in
            section 6.2.2.1.

            The purpose of this normalization is to help provide unique
            URIs.  Note that this normalization is not sufficient to
            provide uniqueness.  Two URIs that are textually distinct
            after this normalization may still be equivalent.

            Objects using this textual convention MAY restrict the
            schemes that they permit.  For example, 'data:' and 'urn:'
            schemes might not be appropriate.

            A zero-length URI is not a valid URI.  This can be used to
            express 'URI absent' where required, for example when used
            as an index field.

            STD 66 URIs are of unlimited length.  Objects using this
            textual convention impose a length limit on the URIs that
            they can represent.  Where no length restriction is
            required, objects SHOULD use the 'Uri' textual convention
            instead.  Objects used as indices SHOULD subtype the 'Uri'
            textual convention."
   REFERENCE "RFC 3986 STD 66 and RFC 3305"
   SYNTAX      OCTET STRING (SIZE (0..1024))

END


5.  Security Considerations

   See also the Security Considerations of STD 66 [RFC3986].

   This MIB module does not define any management objects.  Instead, it
   defines a textual convention that may be imported by other MIB
   modules and used for object definitions.

   Meaningful security considerations can only be written in the MIB
   modules that define management objects.  This document therefore has
   no impact on the security of the Internet.

6.  IANA Considerations

   URI-TC-MIB should be rooted under the mib-2 subtree.  IANA is
   requested to assign { mib-2 XXX } to the URI-TC-MIB module specified



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   in this document.

7.  Acknowledgements

   This module was generated by editing together contributions from
   Randy Presuhn, Dan Romascanu, Bill Fenner, Juergen Schoenwaelder, and
   others.

8.  References

8.1  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2578]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Structure of Management Information
              Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.

   [RFC2579]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Textual Conventions for SMIv2",
              STD 58, RFC 2579, April 1999.

   [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Conformance Statements for SMIv2", STD 58, RFC 2580,
              April 1999.

   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66,
              RFC 3986, January 2005.

8.2  Informative References

   [RFC3305]  Mealling, M. and R. Denenberg, "Report from the Joint W3C/
              IETF URI Planning Interest Group: Uniform Resource
              Identifiers (URIs), URLs, and Uniform Resource Names
              (URNs): Clarifications and Recommendations", RFC 3305,
              August 2002.

   [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
              "Introduction and Applicability Statements for Internet-
              Standard Management Framework", RFC 3410, December 2002.









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Author's Address

   David McWalter (editor)
   Data Connection Ltd
   100 Church Street
   Enfield  EN2 6BQ
   United Kingdom

   Email: dmcw@dataconnection.com










































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Copyright Statement

   Copyright (C) The IETF Trust (2007).  This document is subject to the
   rights, licenses and restrictions contained in BCP 78, and except as
   set forth therein, the authors retain all their rights.


Acknowledgment

   Funding for the RFC Editor function is currently provided by the
   Internet Society.




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