Internet Assigned Numbers Authority Link Relations Created 2005-08-26 Last Updated 2023-09-18 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registry included below • Link Relation Types Link Relation Types Registration Procedure(s) Specification Required Expert(s) Mark Nottingham, Julian Reschke, Jan Algermissen Reference [RFC8288] Note New link relations, along with changes to existing relations, can be requested using the [registry interface] or the mailing list defined in [RFC8288]. Available Formats [IMG] CSV Relation Name Description Reference Notes Refers to a resource about that is the subject [RFC6903], section 2 of the link's context. Asserts that the link target provides an acl access control [https://solidproject.org/TR/wac#acl-link-relation] resource for the link context. Refers to a alternate substitute for this [HTML] context Used to reference alternative content amphtml that uses the AMP [AMP HTML] profile of the HTML format. appendix Refers to an [HTML 4.01 Specification] appendix. Refers to an icon for apple-touch-icon the context. Synonym [Configuring Web Applications] for icon. Refers to a launch apple-touch-startup-image screen for the [Configuring Web Applications] context. Refers to a collection of archives records, documents, [HTML5] or other materials of historical interest. author Refers to the [HTML] See also 'me' context's author. Identifies the entity that blocks access to blocked-by a resource following [RFC7725] receipt of a legal demand. Gives a permanent bookmark link to use for [HTML] bookmarking purposes. Designates the canonical preferred version of [RFC6596] a resource (the IRI and its contents). Refers to a chapter chapter in a collection of [HTML 4.01 Specification] resources. Indicates that the link target is cite-as preferred over the [RFC8574] link context for the purpose of permanent citation. The target IRI points to a resource which collection represents the [RFC6573] collection resource for the context IRI. contents Refers to a table of [HTML 4.01 Specification] contents. The document linked to was later converted to the document that contains this link This relation is different than "predecessor-version" relation. For in that "predecessor-version" is for items in a version convertedfrom example, an RFC can [RFC7991] control system. It is also different than "previous" in have a link to the that this relation is used for converted resources, not Internet-Draft that those that are part of a sequence of resources. became the RFC; in that case, the link relation would be "convertedFrom". Refers to a copyright copyright statement that [HTML 4.01 Specification] applies to the link's context. The target IRI points create-form to a resource where a [RFC6861] submission form can be obtained. Refers to a resource containing the most current recent item(s) in a [RFC5005] collection of resources. Refers to a resource describedby providing information [Protocol for Web Description Resources (POWDER)] about the link's context. The relationship A 'describes' B asserts that resource A provides a This link relation type is the inverse of the description of 'describedby' relation type. While 'describedby' resource B. There are establishes a relation from the described resource back describes no constraints on the [RFC6892] to the resource that describes it, 'describes' format or established a relation from the describing resource to representation of the resource it describes. If B is 'describedby' A, either A or B, then A 'describes' B. neither are there any further constraints on either resource. Refers to a list of patent disclosures disclosure made with respect to [RFC6579] material for which 'disclosure' relation is specified. Used to indicate an origin that will be used to fetch required resources dns-prefetch for the link context, [HTML] and that the user agent ought to resolve as early as possible. Refers to a resource whose available representations are This relation is for static resources. That is, an HTTP duplicate byte-for-byte [RFC6249] GET request on any duplicate will return the same identical with the representation. It does not make sense for dynamic or corresponding POSTable resources and should not be used for them. representations of the context IRI. Refers to a resource edit that can be used to [RFC5023] edit the link's context. The target IRI points to a resource where a edit-form submission form for [RFC6861] editing associated resource can be obtained. Refers to a resource that can be used to edit-media edit media associated [RFC5023] with the link's context. Identifies a related resource that is enclosure potentially large and [RFC4287] might require special handling. Refers to a resource external that is not part of [HTML] the same site as the current context. An IRI that refers to the furthest This relation type registration did not indicate a first preceding resource in [RFC8288] reference. Originally requested by Mark Nottingham in a series of December 2004. resources. glossary Refers to a glossary [HTML 4.01 Specification] of terms. Refers to help context-sensitive [HTML] help. Refers to a resource This relation is used in CoRE where links are retrieved hosts hosted by the server [RFC6690] as a "/.well-known/core" resource representation, and indicated by the link is the default relation type in the CoRE Link Format. context. Refers to a hub that enables registration hub for notification of [WebSub] This relation type was requested by Brett Slatkin. updates to the context. Refers to an icon icon representing the [HTML] link's context. index Refers to an index. [HTML 4.01 Specification] refers to a resource associated with a time interval that intervalafter ends before the [Time Ontology in OWL] section 4.2.21 beginning of the time interval associated with the context resource refers to a resource associated with a time interval that intervalbefore begins after the end [Time Ontology in OWL] section 4.2.22 of the time interval associated with the context resource refers to a resource associated with a time interval that begins after the beginning of the time intervalcontains interval associated [Time Ontology in OWL] section 4.2.23 with the context resource, and ends before the end of the time interval associated with the context resource refers to a resource associated with a time interval that begins after the end of the time interval intervaldisjoint associated with the [Time Ontology in OWL] section 4.2.24 context resource, or ends before the beginning of the time interval associated with the context resource refers to a resource associated with a time interval that begins before the beginning of the time intervalduring interval associated [Time Ontology in OWL] section 4.2.25 with the context resource, and ends after the end of the time interval associated with the context resource refers to a resource associated with a time interval whose beginning coincides with the beginning of the time interval intervalequals associated with the [Time Ontology in OWL] section 4.2.26 context resource, and whose end coincides with the end of the time interval associated with the context resource refers to a resource associated with a time interval that begins after the beginning of the time interval associated intervalfinishedby with the context [Time Ontology in OWL] section 4.2.27 resource, and whose end coincides with the end of the time interval associated with the context resource refers to a resource associated with a time interval that begins before the beginning of the time interval associated intervalfinishes with the context [Time Ontology in OWL] section 4.2.28 resource, and whose end coincides with the end of the time interval associated with the context resource refers to a resource associated with a time interval that begins before or is coincident with the beginning of the time interval associated intervalin with the context [Time Ontology in OWL] section 4.2.29 resource, and ends after or is coincident with the end of the time interval associated with the context resource refers to a resource associated with a time interval whose intervalmeets beginning coincides [Time Ontology in OWL] section 4.2.30 with the end of the time interval associated with the context resource refers to a resource associated with a time interval whose intervalmetby end coincides with [Time Ontology in OWL] section 4.2.31 the beginning of the time interval associated with the context resource refers to a resource associated with a time interval that begins before the beginning of the time intervaloverlappedby interval associated [Time Ontology in OWL] section 4.2.32 with the context resource, and ends after the beginning of the time interval associated with the context resource refers to a resource associated with a time interval that begins before the end of the time interval intervaloverlaps associated with the [Time Ontology in OWL] section 4.2.33 context resource, and ends after the end of the time interval associated with the context resource refers to a resource associated with a time interval whose beginning coincides with the beginning of intervalstartedby the time interval [Time Ontology in OWL] section 4.2.34 associated with the context resource, and ends before the end of the time interval associated with the context resource refers to a resource associated with a time interval whose beginning coincides with the beginning of intervalstarts the time interval [Time Ontology in OWL] section 4.2.35 associated with the context resource, and ends after the end of the time interval associated with the context resource The target IRI points to a resource that is item a member of the [RFC6573] collection represented by the context IRI. An IRI that refers to the furthest This relation type registration did not indicate a last following resource in [RFC8288] reference. Originally requested by Mark Nottingham in a series of December 2004. resources. Points to a resource containing the latest latest-version (e.g., current) [RFC5829] version of the context. Refers to a license For implications of use in HTML, see: license associated with this [RFC4946] http://www.w3.org/TR/html5/links.html#link-type-license context. The link target of a link with the "linkset" relation linkset type provides a set [RFC9264] of links, including links in which the link context of the link participates. Refers to further information about the link's context, expressed as a LRDD ("Link-based Resource Descriptor Document") resource. See [RFC6415] for information about processing this relation type in lrdd host-meta documents. [RFC6415] When used elsewhere, it refers to additional links and other metadata. Multiple instances indicate additional LRDD resources. LRDD resources MUST have an "application/xrd+xml" representation, and MAY have others. manifest Links to a manifest [Web App Manifest] file for the context. Refers to a mask that mask-icon can be applied to the [Creating Pinned Tab Icons] icon for the context. Links to a resource me about the author of [https://microformats.org/wiki/rel-me] See also 'author' the link's context. Refers to a feed of personalised media media-feed recommendations [https://wicg.github.io/media-feeds/#discovery-of-media-feeds] relevant to the link context. The Target IRI points to a Memento, a fixed A Memento for an Original Resource is a resource that memento resource that will [RFC7089] encapsulates a prior state of the Original Resource. not change state anymore. Links to the micropub context's Micropub [Micropub] endpoint. Refers to a module that the user agent modulepreload is to preemptively [HTML] fetch and store for use in the current context. Refers to a resource monitor that can be used to [RFC5989] monitor changes in an HTTP resource. Refers to a resource that can be used to monitor-group monitor changes in a [RFC5989] specified group of HTTP resources. Indicates that the link's context is a next part of a series, and [HTML] that the next in the series is the link target. Refers to the next-archive immediately following [RFC5005] archive resource. Indicates that the context’s original nofollow author or publisher [HTML] does not endorse the link target. Indicates that any newly created top-level browsing noopener context which results [HTML] from following the link will not be an auxiliary browsing context. Indicates that no noreferrer referrer information [HTML] is to be leaked when following the link. Indicates that any newly created top-level browsing opener context which results [HTML] from following the link will be an auxiliary browsing context. Refers to an OpenID Authentication server on which the context openid2.local_id relies for an [OpenID Authentication 2.0 - Final] assertion that the end user controls an Identifier. Refers to a resource which accepts OpenID openid2.provider Authentication [OpenID Authentication 2.0 - Final] protocol messages for the context. The Target IRI points An Original Resource is a resource that exists or used original to an Original [RFC7089] to exist, and for which access to one of its prior Resource. states may be required. Refers to a P3P [The Platform for Privacy Preferences 1.0 (P3P1.0) p3pv1 privacy policy for Specification] the context. This relation type registration did not indicate a reference. Requested by Joshua Kinberg and Robert Sayre. It is meant as a general way to facilitate acts of payment, and thus this specification makes no assumptions on the type of payment or transaction protocol. Examples may include a web page where donations are accepted or where goods and services are Indicates a resource available for purchase. rel="payment" is not intended payment where payment is [RFC8288] to initiate an automated transaction. In Atom accepted. documents, a link element with a rel="payment" attribute may exist at the feed/channel level and/or the entry/item level. For example, a rel="payment" link at the feed/channel level may point to a "tip jar" URI, whereas an entry/ item containing a book review may include a rel="payment" link that points to the location where the book may be purchased through an online retailer. Gives the address of pingback the pingback resource [Pingback 1.0] for the link context. Used to indicate an origin that will be used to fetch required resources for the link context. Initiating an early connection, which preconnect includes the DNS [HTML] lookup, TCP handshake, and optional TLS negotiation, allows the user agent to mask the high latency costs of establishing a connection. Points to a resource containing the predecessor-version predecessor version [RFC5829] in the version history. The prefetch link relation type is used to identify a resource that might be required by the next navigation from prefetch the link context, and [HTML] that the user agent ought to fetch, such that the user agent can deliver a faster response once the resource is requested in the future. Refers to a resource that should be loaded early in the Additional target attributes establish the detailed preload processing of the [Preload] fetch properties of the link. link's context, without blocking rendering. Used to identify a resource that might be required by the next navigation from the link context, and that the user agent prerender ought to fetch and [Resource Hints] execute, such that the user agent can deliver a faster response once the resource is requested in the future. Indicates that the link's context is a prev part of a series, and [HTML] that the previous in the series is the link target. Refers to a resource preview that provides a [RFC6903], section 3 preview of the link's context. Refers to the previous resource in previous an ordered series of [HTML 4.01 Specification] resources. Synonym for "prev". Refers to the prev-archive immediately preceding [RFC5005] archive resource. Refers to a privacy privacy-policy policy associated [RFC6903], section 4 with the link's context. Identifying that a resource representation conforms to a certain Profile URIs are primarily intended to be used as profile profile, without [RFC6906] identifiers, and thus clients SHOULD NOT affecting the indiscriminately access profile URIs. non-profile semantics of the resource representation. Links to a publication manifest. A manifest represents structured publication information about a [Publication Manifest] publication, such as informative metadata, a list of resources, and a default reading order. related Identifies a related [RFC4287] resource. Identifies the root of RESTCONF API as configured on this HTTP server. The "restconf" relation defines the root of restconf the API defined in [RFC8040] RFC8040. Subsequent revisions of RESTCONF will use alternate relation values to support protocol versioning. Identifies a resource replies that is a reply to [RFC4685] the context of the link. The resource identified by the link target provides an input value to an ruleinput instance of a rule, [OCF Core Optional 2.2.0] where the resource which represents the rule instance is identified by the link context. Refers to a resource that can be used to search search through the [OpenSearch] link's context and related resources. Refers to a section section in a collection of [HTML 4.01 Specification] resources. Conveys an identifier self for the link's [RFC4287] context. Indicates a URI that When used in an Atom document, this relation type service can be used to [RFC5023] specifies Atom Publishing Protocol service documents by retrieve a service default. Requested by James Snell. document. Identifies service description for the service-desc context that is [RFC8631] primarily intended for consumption by machines. Identifies service documentation for the service-doc context that is [RFC8631] primarily intended for human consumption. Identifies general metadata for the service-meta context that is [RFC8631] primarily intended for consumption by machines. Refers to a capability set document that defines parameters or configuration sip-trunking-capability requirements for [RFC9409] automated peering and communication-channel negotiation of the Session Initiation Protocol (SIP). Refers to a resource that is within a context that is sponsored sponsored (such as [Google Blog post 09-2019] advertising or another compensation agreement). Refers to the first start resource in a [HTML 4.01 Specification] collection of resources. Identifies a resource status that represents the [RFC8631] context's status. stylesheet Refers to a [HTML] stylesheet. Refers to a resource serving as a subsection subsection in a [HTML 4.01 Specification] collection of resources. Points to a resource successor-version containing the [RFC5829] successor version in the version history. Identifies a resource that provides sunset information about the [RFC8594] context's retirement policy. Gives a tag (identified by the tag given address) that [HTML] applies to the current document. Refers to the terms terms-of-service of service associated [RFC6903], section 5 with the link's context. The Target IRI points A TimeGate for an Original Resource is a resource that timegate to a TimeGate for an [RFC7089] is capable of datetime negotiation to support access to Original Resource. prior states of the Original Resource. The Target IRI points A TimeMap for an Original Resource is a resource from timemap to a TimeMap for an [RFC7089] which a list of URIs of Mementos of the Original Original Resource. Resource is available. Refers to a resource identifying the abstract semantic type type of which the [RFC6903], section 6 link's context is considered to be an instance. Refers to a resource ugc that is within a [Google Blog post 09-2019] context that is User Generated Content. Refers to a parent up document in a [RFC8288] This relation type registration did not indicate a hierarchy of reference. Requested by Noah Slater. documents. Points to a resource version-history containing the [RFC5829] version history for the context. Identifies a resource via that is the source of [RFC4287] the information in the link's context. Identifies a target URI that supports the Webmention protocol. This allows clients This is a similar "Linkback" mechanism to the ones of that mention a Refback, Trackback, and Pingback. It uses a different webmention resource in some form [Webmention] protocol, though, and thus should be discoverable of publishing process through its own link relation type. to contact that endpoint and inform it that this resource has been mentioned. Points to a working working-copy copy for this [RFC5829] resource. Points to the versioned resource working-copy-of from which this [RFC5829] working copy was obtained. Licensing Terms