URI Fragment Identifiers for the text/plain Media Type
RFC 5147
| Document | Type |
RFC - Proposed Standard
(April 2008; No errata)
Updates RFC 2046
Was draft-wilde-text-fragment (individual in app area)
|
|
|---|---|---|---|
| Authors | Martin Dürst , Erik Wilde | ||
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5147 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Chris Newman | ||
| Send notices to | (None) | ||
Network Working Group E. Wilde
Request for Comments: 5147 UC Berkeley
Updates: 2046 M. Duerst
Category: Standards Track Aoyama Gakuin University
April 2008
URI Fragment Identifiers for the text/plain Media Type
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.
Abstract
This memo defines URI fragment identifiers for text/plain MIME
entities. These fragment identifiers make it possible to refer to
parts of a text/plain MIME entity, either identified by character
position or range, or by line position or range. Fragment
identifiers may also contain information for integrity checks to make
them more robust.
Wilde & Duerst Standards Track [Page 1]
RFC 5147 text/plain Fragment Identifiers April 2008
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. What Is text/plain? . . . . . . . . . . . . . . . . . . . 3
1.2. What Is a URI Fragment Identifier? . . . . . . . . . . . . 4
1.3. Why text/plain Fragment Identifiers? . . . . . . . . . . . 4
1.4. Incremental Deployment . . . . . . . . . . . . . . . . . . 5
1.5. Notation Used in This Memo . . . . . . . . . . . . . . . . 5
2. Fragment Identification Methods . . . . . . . . . . . . . . . 5
2.1. Fragment Identification Principles . . . . . . . . . . . . 6
2.1.1. Positions and Ranges . . . . . . . . . . . . . . . . . 6
2.1.2. Characters and Lines . . . . . . . . . . . . . . . . . 7
2.2. Combining the Principles . . . . . . . . . . . . . . . . . 7
2.2.1. Character Position . . . . . . . . . . . . . . . . . . 7
2.2.2. Character Range . . . . . . . . . . . . . . . . . . . 8
2.2.3. Line Position . . . . . . . . . . . . . . . . . . . . 8
2.2.4. Line Range . . . . . . . . . . . . . . . . . . . . . . 8
2.3. Fragment Identifier Robustness . . . . . . . . . . . . . . 8
3. Fragment Identification Syntax . . . . . . . . . . . . . . . . 9
3.1. Integrity Checks . . . . . . . . . . . . . . . . . . . . . 9
4. Fragment Identifier Processing . . . . . . . . . . . . . . . . 10
4.1. Handling of Line Endings in text/plain MIME Entities . . . 10
4.2. Handling of Position Values . . . . . . . . . . . . . . . 11
4.3. Handling of Integrity Checks . . . . . . . . . . . . . . . 11
4.4. Syntax Errors in Fragment Identifiers . . . . . . . . . . 12
5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
7. Security Considerations . . . . . . . . . . . . . . . . . . . 13
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8.1. Normative References . . . . . . . . . . . . . . . . . . . 14
8.2. Informative References . . . . . . . . . . . . . . . . . . 14
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 16
Wilde & Duerst Standards Track [Page 2]
RFC 5147 text/plain Fragment Identifiers April 2008
1. Introduction
This memo updates the text/plain media type defined in RFC 2046 [3]
by defining URI fragment identifiers for text/plain MIME entities.
This makes it possible to refer to parts of a text/plain MIME entity.
Such parts can be identified by either character position or range,
or by line position or range. Integrity checking information can be
added to a fragment identifier to make it more robust, enabling
applications to detect changes of the entity.
This section gives an introduction to the general concepts of text/
plain MIME entities and URI fragment identifiers, and it discusses
the need for fragment identifiers for text/plain and deployment
issues. Section 2 discusses the principles and methods on which this
memo is based. Section 3 defines the syntax, and Section 4 discusses
processing of text/plain fragment identifiers. Section 5 shows some
examples.
1.1. What Is text/plain?
Internet Media Types (often referred to as "MIME types"), as defined
in RFC 2045 [2] and RFC 2046 [3], are used to identify different
types and sub-types of media. RFC 2046 [3] and RFC 3676 [6] specify
the text/plain media type, which is used for simple, unformatted
text. Quoting from RFC 2046 [3]: "Plain text does not provide for or
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