Citat:
A link for a group of resources is an incoming link to a resource in the group, i.e., a link having a resource in the group as its target. Links for the group can include express links, implied links, or both. An express link, e.g., a
hyperlink, is a link that is included in a source resource that a user can follow to navigate to a target resource. [B]An implied link is a reference to a target resource, e.g., a citation to the target resource, which is included in a source resource but is
not an express link to the target resource. Thus, a resource in the group can be the target of an implied link without a user being able to navigate to the resource by following the implied link.