existing-rel-values

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existing rel values

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 defining specification
alternateDesignates 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
appendixRefers to a document serving as an appendix in a collection of documents.HTML4 link type
author...???
bookmarkRefers 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
chapterRefers to a document serving as a chapter in a collection of documents.HTML4 link type
contentsRefers to a document serving as a table of contents. Some user agents also support the synonym ToC (from "Table of Contents").HTML4 link type
copyrightRefers 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 refrenced document to be a friend XFN
glossaryRefers to a document providing a glossary of terms that pertain to the current document.HTML4 link type
helpRefers to a document offering help (more information, links to other sources information, etc.)HTML4 link type
indexRefers to a document providing an index for the current document.HTML4 link type
methe referenced document represents the same person as the current documentXFN
homethe referenced document is the homepage of the site in which the current page appears.rel-home
licensethe referenced document is license information for the current page.rel-license
microsummary...Microsummary
nextRefers 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
prevRefers to the previous document in an ordered series of documents. Some user agents also support the synonym "Previous".HTML4 link type
previousSynonym of prevHTML4 link type
schema.DC...Dublin Core
schema.DCTERMS...Dublin Core
search...???
sectionRefers to a document serving as a section in a collection of documents.HTML4 link type
startRefers 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
stylesheeta style sheet for the current documentHTML4 link type
subsectionRefers to a document serving as a subsection in a collection of documents.HTML4 link type
tagthe referenced document represents a "tag", which is like a keyword or category label, for the current documentrel-tag
tocSynonym 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
groupthe referenced document represents a group that the person represented by the current document belongs togroup-brainstorming
memberthe referenced document represents a member of the group represented by the current documentgroup-brainstorming

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
archivean archive document for the current blogunknown origin

tools

See implementations.

related

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

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