Additional Link Relation Types
RFC 6903
Independent Submission J. Snell
Request for Comments: 6903 March 2013
Category: Informational
ISSN: 2070-1721
Additional Link Relation Types
Abstract
This specification defines a number of additional link relation types
that can used for a range of purposes in a variety of applications
types.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This is a contribution to the RFC Series, independently of any other
RFC stream. The RFC Editor has chosen to publish this document at
its discretion and makes no statement about its value for
implementation or deployment. Documents approved for publication by
the RFC Editor are not a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6903.
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RFC 6903 Additional Link Relations March 2013
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. "about" . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. "preview" . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4. "privacy-policy" . . . . . . . . . . . . . . . . . . . . . . 3
4.1. The "privacy-policy" Link Relation and P3P . . . . . . . 4
5. "terms-of-service" . . . . . . . . . . . . . . . . . . . . . 4
6. "type" . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
8. Security Considerations . . . . . . . . . . . . . . . . . . . 6
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
9.1. Normative References . . . . . . . . . . . . . . . . . . 6
9.2. Informative References . . . . . . . . . . . . . . . . . 6
1. Introduction
The fundamental model for web links and the "Link Relations" registry
are established by [RFC5988]. This specification defines and adds
the following additional link relation types to the registry:
"about", "preview", "privacy-policy", "terms-of-service", and "type".
2. "about"
The "about" link relation can be used to refer to a resource that is
the subject or topic of the link's context. Multiple subjects can be
indicated through the use of multiple "about" link relations.
For example, if the context resource is a review about a particular
product, the "about" link can be used to reference the URL of the
product:
HTTP/1.1 200 OK
Content-Type: application/json
Link: <http://store.example.org/product/abc>; rel="about"
{...}
3. "preview"
The "preview" link relation can be used to refer to a resource that
serves as a preview of the link's context, likely with reduced
quality or limited content. For instance, the preview link might
reference a screen capture of a video, a brief snippet of audio from
a song, or a thumbnail representation of an image.
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RFC 6903 Additional Link Relations March 2013
For example, issuing an HTTP HEAD request to a URI representing a
large video or image file might return a link to a short or lower-
quality preview of the original:
HTTP/1.1 200 OK
Content-Text: video/mpeg
Link: <http://example.org/preview/10-second-preview.mpg>;
rel="preview"; type="video/mpeg"
4. "privacy-policy"
The "privacy-policy" link relation can be used to refer to a resource
describing the privacy policy associated with the link's context.
The privacy policy can be any resource that discloses what personal
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