Hiberlink is funded by the Andrew W. Mellon Foundation The Missing Link Proposal #hiberlink #memento Herbert Van de Sompel Los Alamos National

Herbert Van de Sompel Data Citation Workshop, April This Presentation Referencing scholarly resources on the Web; machine-use Assumption: Referenced resources behave like regular web resources, i.e. dynamic, ephemeral Take away: Need to augment the URI of the referenced resource to reference it Based on insights from: Memento - Time Travel for the Web Hiberlink - Addressing Reference Rot in Research Communication Open Annotation – Annotating (scholarly) resources

Herbert Van de Sompel Data Citation Workshop, April Reference Augmented with Time URI-R is referenced resource URI-R evolves over time (changes, disappears) Reference URI-R as it was accessed at a given moment in time, cf. “accessed on Feb 8 th 2012” style references Referencing info: URI-R ; datetime <a href=“URI-R” memento-date=“ ”>link text In combination with Memento infrastructure, this allows accessing the version of URI-R as it was on , if such version exists

Herbert Van de Sompel Data Citation Workshop, April Reference Augmented with URI of Snapshot/Archived Resource URI-R is referenced resource URI-R evolves over time (changes, disappears) URI-M is a snapshot of the resource at the time of referencing Referencing info: URI-R ; URI-M <a href=“URI-R” memento-uri=“URI-M”>link text Why not URI-M? URI-R is the web currency for the referenced resource URI-R is understood by all web archives, not just the URI-M one URI-M is subject to link rot: web archives are not forever either

Herbert Van de Sompel Data Citation Workshop, April Reference Augmented with URI of Segment Information? URI-R is referenced resource What needs referencing is a non-trivial segment (spatial, temporal) of URI-R. Let URI-A be a description of the segment Referencing info: URI-R ; URI-A <a href=“URI-R” segment-uri=“URI-A”>link text What is the nature of URI-A? A description of the segment An open annotation of URI-R that describes the segment Annotation expressed in terms of the real referenced resource, not the human/machine splash page

Herbert Van de Sompel Data Citation Workshop, April URI-A

Herbert Van de Sompel Data Citation Workshop, April URI-A

Herbert Van de Sompel Data Citation Workshop, April Dataset Use Case: Segments of Interest URI-A

Herbert Van de Sompel Data Citation Workshop, April Generic Proposal with Harvard Internet Persistence Project Provide a set of links that pertain to URI-R to address a variety of use cases: Link to archived/snapshot resource – web archiving case Link to cached resource – robustness case Link to author of resource – citation graph case Need as information for each link in link set: URI of linked resource Relation type, e.g. memento, duplicate, author (IANA rel types) Typically also date

Herbert Van de Sompel Data Citation Workshop, April Generic Proposal with Harvard Internet Persistence Project Link to archived/snapshot resource – web archiving case <a href=“URI-R” lset=“URI-M memento ”>link text Link to cached resource – robustness case <a href=“URI-R” lset=“URI-C duplicate ”>link text

Herbert Van de Sompel Data Citation Workshop, April Generic Proposal with Harvard Internet Persistence Project Link to author of resource – citation graph case <a href=“URI-R” lset=“URI-ORCID author>link text Link to annotation that describes segment <a href=“URI-R” lset=“URI-A segment>link text