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Identifying Composite Media Features (RFC2938)

IP.com Disclosure Number: IPCOM000005131D
Original Publication Date: 2000-Sep-01
Included in the Prior Art Database: 2001-Aug-16
Document File: 19 page(s) / 35K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Klyne: AUTHOR [+2]

Abstract

In RFC 2533, an expression format is presented for describing media feature capabilities as a combination of simple media feature tags.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 10% of the total text.

Network Working Group G. Klyne Request for Comments: 2938 Content Technologies Updates: 2533 L. Masinter Category: Standards Track AT&T

September 2000

Identifying Composite Media Features

Status of this Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2000). All Rights Reserved.

Abstract

In RFC 2533, an expression format is presented for describing media feature capabilities as a combination of simple media feature tags.

This document describes an abbreviated format for a composite media feature set, based upon a hash of the feature expression describing that composite.

Table of Contents

1. Introduction ................................................2 1.1 Organization of this document ...............................2 1.2 Terminology and document conventions ........................2 2. Motivation and goals ........................................3 3. Composite feature representation ............................4 3.1 Feature set hashed reference format .........................5 3.1.1 Hash value calculation ......................................6 3.1.2 Base-32 value representation ................................7 3.2 Resolving feature set identifiers ...........................8 3.2.1 Query protocol ..............................................8 3.2.2 Inline feature set details ..................................9 4. Examples ...................................................10 5. Internationalization Considerations ........................12 6. Security Considerations ....................................13 7. Acknowledgements ...........................................13 8. References .................................................13

Klyne Masinter Standards Track [Page 1]

RFC 2938 Identifying Composite Media Features September 2000

9. Authors' Addresses .........................................15 10. Appendix A: The birthday paradox ...........................16 11. Full Copyright Statement ...................................18

1. Introduction

In "A Syntax for Describing Media Feature Sets" [1], an expression format is presented for describing media feature capabilities as a combination of simple media feature tags [2].

This document proposes an abbreviated format for a composite media feature set, based upon a hash of the feature expression describing that composite.

This memo extends and builds upon the expression syntax described in RFC 2533 [1], and it is assumed that the reader is familiar with the interpretation of feature set expressions described there.

1.1 Organization of this document

Section 2 sets out some of the background and goals for feature set references.

Section 3 presents a syntax for feature set refere...