2005-08-26 2024-08-01 Specification Required Mark Nottingham, Julian Reschke, Jan Algermissen New link relations, along with changes to existing relations, can be requested using the registry interface or the mailing list defined in . about Refers to a resource that is the subject of the link's context. , section 2 acl Asserts that the link target provides an access control resource for the link context. alternate Refers to a substitute for this context HTML amphtml Used to reference alternative content that uses the AMP profile of the HTML format. AMP HTML appendix Refers to an appendix. HTML 4.01 Specification apple-touch-icon Refers to an icon for the context. Synonym for icon. Configuring Web Applications apple-touch-startup-image Refers to a launch screen for the context. Configuring Web Applications archives Refers to a collection of records, documents, or other materials of historical interest. HTML5 author Refers to the context's author. HTML See also 'me' blocked-by Identifies the entity that blocks access to a resource following receipt of a legal demand. bookmark Gives a permanent link to use for bookmarking purposes. HTML c2pa-manifest This link relation identifies the C2PA Manifest associated with the link context Content Credentials : C2PA Technical Specification canonical Designates the preferred version of a resource (the IRI and its contents). chapter Refers to a chapter in a collection of resources. HTML 4.01 Specification cite-as Indicates that the link target is preferred over the link context for the purpose of permanent citation. collection The target IRI points to a resource which represents the collection resource for the context IRI. contents Refers to a table of contents. HTML 4.01 Specification convertedfrom The document linked to was later converted to the document that contains this link relation. For example, an RFC can have a link to the Internet-Draft that became the RFC; in that case, the link relation would be "convertedFrom". This relation is different than "predecessor-version" in that "predecessor-version" is for items in a version control system. It is also different than "previous" in that this relation is used for converted resources, not those that are part of a sequence of resources. copyright Refers to a copyright statement that applies to the link's context. HTML 4.01 Specification create-form The target IRI points to a resource where a submission form can be obtained. current Refers to a resource containing the most recent item(s) in a collection of resources. describedby Refers to a resource providing information about the link's context. Protocol for Web Description Resources (POWDER) describes The relationship A 'describes' B asserts that resource A provides a description of resource B. There are no constraints on the format or representation of either A or B, neither are there any further constraints on either resource. This link relation type is the inverse of the 'describedby' relation type. While 'describedby' establishes a relation from the described resource back to the resource that describes it, 'describes' established a relation from the describing resource to the resource it describes. If B is 'describedby' A, then A 'describes' B. disclosure Refers to a list of patent disclosures made with respect to material for which 'disclosure' relation is specified. dns-prefetch Used to indicate an origin that will be used to fetch required resources for the link context, and that the user agent ought to resolve as early as possible. HTML duplicate Refers to a resource whose available representations are byte-for-byte identical with the corresponding representations of the context IRI. This relation is for static resources. That is, an HTTP GET request on any duplicate will return the same representation. It does not make sense for dynamic or POSTable resources and should not be used for them. edit Refers to a resource that can be used to edit the link's context. edit-form The target IRI points to a resource where a submission form for editing associated resource can be obtained. edit-media Refers to a resource that can be used to edit media associated with the link's context. enclosure Identifies a related resource that is potentially large and might require special handling. external Refers to a resource that is not part of the same site as the current context. HTML first An IRI that refers to the furthest preceding resource in a series of resources. This relation type registration did not indicate a reference. Originally requested by Mark Nottingham in December 2004. glossary Refers to a glossary of terms. HTML 4.01 Specification help Refers to context-sensitive help. HTML hosts Refers to a resource hosted by the server indicated by the link context. This relation is used in CoRE where links are retrieved as a "/.well-known/core" resource representation, and is the default relation type in the CoRE Link Format. hub Refers to a hub that enables registration for notification of updates to the context. WebSub This relation type was requested by Brett Slatkin. icon Refers to an icon representing the link's context. HTML index Refers to an index. HTML 4.01 Specification intervalafter refers to a resource associated with a time interval that ends before the beginning of the time interval associated with the context resource Time Ontology in OWL section 4.2.21 intervalbefore refers to a resource associated with a time interval that begins after the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.22 intervalcontains refers to a resource associated with a time interval that begins after the beginning of the time interval associated with the context resource, and ends before the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.23 intervaldisjoint refers to a resource associated with a time interval that begins after the end of the time interval associated with the context resource, or ends before the beginning of the time interval associated with the context resource Time Ontology in OWL section 4.2.24 intervalduring refers to a resource associated with a time interval that begins before the beginning of the time interval associated with the context resource, and ends after the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.25 intervalequals refers to a resource associated with a time interval whose beginning coincides with the beginning of the time interval associated with the context resource, and whose end coincides with the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.26 intervalfinishedby refers to a resource associated with a time interval that begins after the beginning of the time interval associated with the context resource, and whose end coincides with the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.27 intervalfinishes refers to a resource associated with a time interval that begins before the beginning of the time interval associated with the context resource, and whose end coincides with the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.28 intervalin refers to a resource associated with a time interval that begins before or is coincident with the beginning of the time interval associated with the context resource, and ends after or is coincident with the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.29 intervalmeets refers to a resource associated with a time interval whose beginning coincides with the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.30 intervalmetby refers to a resource associated with a time interval whose end coincides with the beginning of the time interval associated with the context resource Time Ontology in OWL section 4.2.31 intervaloverlappedby refers to a resource associated with a time interval that begins before the beginning of the time interval associated with the context resource, and ends after the beginning of the time interval associated with the context resource Time Ontology in OWL section 4.2.32 intervaloverlaps refers to a resource associated with a time interval that begins before the end of the time interval associated with the context resource, and ends after the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.33 intervalstartedby refers to a resource associated with a time interval whose beginning coincides with the beginning of the time interval associated with the context resource, and ends before the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.34 intervalstarts refers to a resource associated with a time interval whose beginning coincides with the beginning of the time interval associated with the context resource, and ends after the end of the time interval associated with the context resource Time Ontology in OWL section 4.2.35 item The target IRI points to a resource that is a member of the collection represented by the context IRI. last An IRI that refers to the furthest following resource in a series of resources. This relation type registration did not indicate a reference. Originally requested by Mark Nottingham in December 2004. latest-version Points to a resource containing the latest (e.g., current) version of the context. license Refers to a license associated with this context. For implications of use in HTML, see: http://www.w3.org/TR/html5/links.html#link-type-license linkset The link target of a link with the "linkset" relation type provides a set of links, including links in which the link context of the link participates. lrdd Refers to further information about the link's context, expressed as a LRDD ("Link-based Resource Descriptor Document") resource. See for information about processing this relation type in host-meta documents. 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 file for the context. Web App Manifest mask-icon Refers to a mask that can be applied to the icon for the context. Creating Pinned Tab Icons me Links to a resource about the author of the link's context. See also 'author' media-feed Refers to a feed of personalised media recommendations relevant to the link context. memento The Target IRI points to a Memento, a fixed resource that will not change state anymore. A Memento for an Original Resource is a resource that encapsulates a prior state of the Original Resource. micropub Links to the context's Micropub endpoint. Micropub modulepreload Refers to a module that the user agent is to preemptively fetch and store for use in the current context. HTML monitor Refers to a resource that can be used to monitor changes in an HTTP resource. monitor-group Refers to a resource that can be used to monitor changes in a specified group of HTTP resources. next Indicates that the link's context is a part of a series, and that the next in the series is the link target. HTML next-archive Refers to the immediately following archive resource. nofollow Indicates that the context’s original author or publisher does not endorse the link target. HTML noopener Indicates that any newly created top-level browsing context which results from following the link will not be an auxiliary browsing context. HTML noreferrer Indicates that no referrer information is to be leaked when following the link. HTML opener Indicates that any newly created top-level browsing context which results from following the link will be an auxiliary browsing context. HTML openid2.local_id Refers to an OpenID Authentication server on which the context relies for an assertion that the end user controls an Identifier. OpenID Authentication 2.0 - Final openid2.provider Refers to a resource which accepts OpenID Authentication protocol messages for the context. OpenID Authentication 2.0 - Final original The Target IRI points to an Original Resource. An Original Resource is a resource that exists or used to exist, and for which access to one of its prior states may be required. p3pv1 Refers to a P3P privacy policy for the context. The Platform for Privacy Preferences 1.0 (P3P1.0) Specification payment Indicates a resource where payment is accepted. 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 available for purchase. rel="payment" is not intended to initiate an automated transaction. In Atom 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. pingback Gives the address of the pingback resource for the link context. Pingback 1.0 preconnect Used to indicate an origin that will be used to fetch required resources for the link context. Initiating an early connection, which includes the DNS lookup, TCP handshake, and optional TLS negotiation, allows the user agent to mask the high latency costs of establishing a connection. HTML predecessor-version Points to a resource containing the predecessor version in the version history. prefetch The prefetch link relation type is used to identify a resource that might be required by the next navigation from the link context, and 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. HTML preload Refers to a resource that should be loaded early in the processing of the link's context, without blocking rendering. Preload Additional target attributes establish the detailed fetch properties of the link. prerender Used to identify a resource that might be required by the next navigation from the link context, and that the user agent ought to fetch and execute, such that the user agent can deliver a faster response once the resource is requested in the future. Resource Hints prev Indicates that the link's context is a part of a series, and that the previous in the series is the link target. HTML preview Refers to a resource that provides a preview of the link's context. , section 3 previous Refers to the previous resource in an ordered series of resources. Synonym for "prev". HTML 4.01 Specification prev-archive Refers to the immediately preceding archive resource. privacy-policy Refers to a privacy policy associated with the link's context. , section 4 profile Identifying that a resource representation conforms to a certain profile, without affecting the non-profile semantics of the resource representation. Profile URIs are primarily intended to be used as identifiers, and thus clients SHOULD NOT indiscriminately access profile URIs. publication Links to a publication manifest. A manifest represents structured information about a publication, such as informative metadata, a list of resources, and a default reading order. Publication Manifest related Identifies a related resource. restconf Identifies the root of RESTCONF API as configured on this HTTP server. The "restconf" relation defines the root of the API defined in RFC8040. Subsequent revisions of RESTCONF will use alternate relation values to support protocol versioning. replies Identifies a resource that is a reply to the context of the link. ruleinput The resource identified by the link target provides an input value to an instance of a rule, where the resource which represents the rule instance is identified by the link context. OCF Core Optional 2.2.0 search Refers to a resource that can be used to search through the link's context and related resources. OpenSearch section Refers to a section in a collection of resources. HTML 4.01 Specification self Conveys an identifier for the link's context. service Indicates a URI that can be used to retrieve a service document. When used in an Atom document, this relation type specifies Atom Publishing Protocol service documents by default. Requested by James Snell. service-desc Identifies service description for the context that is primarily intended for consumption by machines. service-doc Identifies service documentation for the context that is primarily intended for human consumption. service-meta Identifies general metadata for the context that is primarily intended for consumption by machines. sip-trunking-capability Refers to a capability set document that defines parameters or configuration requirements for automated peering and communication-channel negotiation of the Session Initiation Protocol (SIP). sponsored Refers to a resource that is within a context that is sponsored (such as advertising or another compensation agreement). Google Blog post 09-2019 start Refers to the first resource in a collection of resources. HTML 4.01 Specification status Identifies a resource that represents the context's status. stylesheet Refers to a stylesheet. HTML subsection Refers to a resource serving as a subsection in a collection of resources. HTML 4.01 Specification successor-version Points to a resource containing the successor version in the version history. sunset Identifies a resource that provides information about the context's retirement policy. tag Gives a tag (identified by the given address) that applies to the current document. HTML terms-of-service Refers to the terms of service associated with the link's context. , section 5 timegate The Target IRI points to a TimeGate for an Original Resource. A TimeGate for an Original Resource is a resource that is capable of datetime negotiation to support access to prior states of the Original Resource. timemap The Target IRI points to a TimeMap for an Original Resource. A TimeMap for an Original Resource is a resource from which a list of URIs of Mementos of the Original Resource is available. type Refers to a resource identifying the abstract semantic type of which the link's context is considered to be an instance. , section 6 ugc Refers to a resource that is within a context that is User Generated Content. Google Blog post 09-2019 up Refers to a parent document in a hierarchy of documents. This relation type registration did not indicate a reference. Requested by Noah Slater. version-history Points to a resource containing the version history for the context. via Identifies a resource that is the source of the information in the link's context. webmention Identifies a target URI that supports the Webmention protocol. This allows clients that mention a resource in some form of publishing process to contact that endpoint and inform it that this resource has been mentioned. Webmention This is a similar "Linkback" mechanism to the ones of Refback, Trackback, and Pingback. It uses a different protocol, though, and thus should be discoverable through its own link relation type. working-copy Points to a working copy for this resource. working-copy-of Points to the versioned resource from which this working copy was obtained.