http hiberlink org hiberlink http mementoweb org memento

http: //hiberlink. org #hiberlink http: //mementoweb. org #memento The Missing Link Proposal Herbert Van de Sompel Los Alamos National Laboratory @hvdsomp Hiberlink is funded by the Andrew W. Mellon Foundation

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 17 2014

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=“ 20130208”>link text</a> • In combination with Memento infrastructure, this allows accessing the version of URI-R as it was on 2013 -02 -08, if such version exists http: //mementoweb. org/missing-link/ Herbert Van de Sompel Data Citation Workshop, April 17 2014

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</a> • 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 http: //mementoweb. org/missing-link/ Herbert Van de Sompel Data Citation Workshop, April 17 2014

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</a> • 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 17 2014

URI-A Herbert Van de Sompel Data Citation Workshop, April 17 2014

URI-A Herbert Van de Sompel Data Citation Workshop, April 17 2014

Dataset Use Case: Segments of Interest URI-A Herbert Van de Sompel Data Citation Workshop, April 17 2014

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 17 2014

Generic Proposal with Harvard Internet Persistence Project • Link to archived/snapshot resource – web archiving case <a href=“URI-R” lset=“URI-M memento 20130208”>link text</a> • Link to cached resource – robustness case <a href=“URI-R” lset=“URI-C duplicate 20140412”>link text</a> Herbert Van de Sompel Data Citation Workshop, April 17 2014

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</a> • Link to annotation that describes segment <a href=“URI-R” lset=“URI-A segment>link text</a> Herbert Van de Sompel Data Citation Workshop, April 17 2014