Link Relations

The Readium Web Publication Manifest specification and its extensions currently define and/or use the following link relations:

Relation	Definition	Reference
alternate	Designates a substitute for the link’s context	HTML5
contents	Refers to a table of contents	HTML4
cover	Refers to a publication’s cover	Readium Web Publication Manifest
manifest	Links to a manifest	Web App Manifest
search	Refers to a URI or templated URI that will perform a search	HTML5
self	Conveys an identifier for the link’s context	Atom Syndication Format

In addition to these relations, any term define in the IANA link registry can also be used.

Extensions must either be registered on this repo or rely on URIs.

OPDS 2.0

While OPDS 2.0 itself is not an extension of the Readium Web Publication Manifest, it shares the same abstract model and syntax.

For this reason, it feels relevant to list the link relations introduced by OPDS as well.

Relation	Definition	Reference
http://opds-spec.org/acquisition	Fallback acquisition relation when no other relation is a good fit to express the nature of the transaction.	OPDS 1.2
http://opds-spec.org/acquisition/open-access	Indicates that a publication is freely accessible without any requirement, including authentication.	OPDS 1.2
http://opds-spec.org/acquisition/borrow	Indicates that a publication can be borrowed for a limited period of time.	OPDS 1.2
http://opds-spec.org/acquisition/buy	Indicates that a publication can be purchased for a given price.	OPDS 1.2
http://opds-spec.org/acquisition/sample	Indicates that a sub-set of the full publication is freely accessible at a given URI, without any prior requirement.	OPDS 1.2
preview	Indicates that a sub-set of the full publication is freely accessible at a given URI, without any prior requirement.	RFC 6903
http://opds-spec.org/acquisition/subscribe	Indicates that a publication be subscribed to, usually as part of a purchase and for a limited period of time.	OPDS 1.2

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