existing-rel-values

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| [[rel-directory|directory]] || …indicates that the destination of the hyperlink is a directory listing containing an entry for the current page. || [[rel-directory]]
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Revision as of 18:12, 24 September 2007

Contents

existing rel values

authors

usage

rel values indicate the relationship of the target resource to the resource on which they appear. In microformats, rel are used on links (e.g. <a rel="home" href="http://example.org">). Elsewhere, they are also used on link headers (e.g. <link rel="start" href="http://example.org/section/page1.htm">.

Multiple values may be used, in the same manner as multiple class values (e.g. <a rel="home me contents" href="http://example.org">).

rev

In (X)HTML, the same values may be used as rev ("reverse relationship") values, to indicate the relationship of the resource on which they appear to the target resource. Such use (apart from the "grand-fathered" case of VoteLinks) is deprecated in microformats.

formats

These rel values are defined formats from specifications (HTML 4, microformats) are thus are recommended for general use. Alphabetically ordered by value.

Note: this list is incomplete, please help complete it from the following sources:

rel value summary
(from the relevant specification where possible))
defining specification
alternate Designates substitute versions for the document in which the link occurs. When used together with the lang attribute, it implies a translated version of the document. When used together with the media attribute, it implies a version designed for a different medium (or media). HTML4 link type
appendix Refers to a document serving as an appendix in a collection of documents. HTML4 link type
author...???
bookmark Refers to a bookmark. A bookmark is a link to a key entry point within an extended document. The title attribute may be used, for example, to label the bookmark. Note that several bookmarks may be defined in each document. HTML4 link type
chapter Refers to a document serving as a chapter in a collection of documents. HTML4 link type
contents Refers to a document serving as a table of contents. Some user agents also support the synonym ToC (from "Table of Contents"). HTML4 link type
copyright Refers to a copyright statement for the current document. HTML4 link type
friend the person represented by the current document considers the person represented by the referenced document to be a friend XFN
glossary Refers to a document providing a glossary of terms that pertain to the current document.HTML4 link type
help Refers to a document offering help (more information, links to other sources information, etc.) HTML4 link type
index Refers to a document providing an index for the current document. HTML4 link type
me the referenced document represents the same person as does the current document XFN
home …indicates that the [referenced document] is the homepage of the site in which the current page appears. rel-home
license …indicates that the [referenced document] is a license for the current page. rel-license
microsummaryMicrosummary
next Refers to the next document in a linear sequence of documents. User agents may choose to preload the "next" document, to reduce the perceived load time. HTML4 link type
prev Refers to the previous document in an ordered series of documents. Some user agents also support the synonym "Previous". HTML4 link type
previous Synonym of prev HTML4 link type
schema.DC Dublin Core
schema.DCTERMS Dublin Core
search  ???
section Refers to a document serving as a section in a collection of documents. HTML4 link type
start Refers to the first document in a collection of documents. This link type tells search engines which document is considered by the author to be the starting point of the collection. HTML4 link type
stylesheet a style sheet for the current document HTML4 link type
subsection Refers to a document serving as a subsection in a collection of documents. HTML4 link type
tag …indicates that the [referenced document] is an author-designated "tag" (or keyword/subject) for the current page. rel-tag
toc Synonym of contents (from "Table Of Contents") HTML4 link type

notes

brainstorming

Several rel values are being brainstormed as potential microformats and are thus listed here. If you find you have a use for such semantics in real world examples, consider trying out these values and provide feedback on the respective brainstorming page(s) with your results/experience.

Sources: group-brainstorming, ...

rel value summary proposed in
cite indicate[s] that the destination of that hyperlink is an authoritative source or a precedent to the current page. distributed-conversation-brainstorming
directory …indicates that the destination of the hyperlink is a directory listing containing an entry for the current page. rel-directory
group the referenced document represents a group to which the person represented by the current document belongs group-brainstorming
member the referenced document represents a member of the group represented by the current document group-brainstorming
product
profilexmdp-brainstorming

external proposals

WCLR

Web Communication Link Relationships. Includes:

rel value summary


archive
comment
contribution
endorsed
feed
permalink
pingback
referral
related
resource
sponsor
trackback
unendorsed
user
via

dropped

The following rel values were in earlier version(s) of specification(s) and it is presumed by their absence from the most recent version of the respective specification(s) that they have been deprecated or obsoleted. Use of them could be considered a bit more standard than just POSH, although you may wish to research why such values were omitted from latter specifications before using them. If you do discover the reasoning, please add a short statement or link to thereof into the appropriate place in the following table.

Sources: HTML3 (expired!) - (has been superceded by HTML 3.2 - which itself has been superceded by HTML 4.0 - which itself has been updated by HTML 4.01, commonly referred to as "HTML 4" in this wiki and other places.)

rel value summary defining specification why dropped
bannerWas used to reference another document to be used as banner for this document (i.e. a form of "include" statement).HTML 3unknown
upWhen the document forms part of a hierarchy, this link references the immediate parent of the current document.HTML 3unknown

POSH usage

There are numerous rel values used as POSH in the wild, their origins are not necessarily known, nor are their meanings consistent, but it may still be useful to document their existence and summarize their implied meanings/usage intent.

rel value summary origin
archive index of archived entries Web Communication Link Relationships (see above)

tools

See implementations.

related

existing-rel-values was last modified: Wednesday, December 31st, 1969

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