The presentation was given by René van Horik from Data Archiving & Networked Services, The Netherlands, at the PRELIDA Midterm Workshop in Catania, April 2014.

1. Midterm Workshop, Catania, April 2014
D3.1 State of the art assessment on Linked Data
and Digital Preservation
René van Horik, Data Archiving & Networked Services, The Netherlands

2. Midterm Workshop, Catania, April 2014
Outline
• Introduction / Context
• Summary of Deliverable D3.1

3. Midterm Workshop, Catania, April 2014
Objectives of the PRELIDA Project
• collect, organize and publish use cases related to the
long-term access to LD
• create a comprehensive state of the art on LD and DP
technologies
• set up a technology observatory
• bring together scientists and stakeholders for
identifying relevant challenges and paths for
addressing them in the near future
• draw attention of standardization bodies

4. Midterm Workshop, Catania, April 2014
WP3 of Prelida project
• Objective of WP3:
– to provide overview of the state of art in Digital Preservation
and Linked Data.
– Information transfer between two communities.
• Partners: CNR / APA / HUD / UIBK
• Contributors: Sotiris Batsakis, David Giaretta,
Christophe Gueret, René van Horik, Maarten
Hogerwerf, Antoine Isaac, Carlo Meghini, Andrea
Scharnhorst.
• Deliverables:
– WP3.1 State of the art (month 12)
– WP3.2 Consolidated state of art (month 24)

5. Midterm Workshop, Catania, April 2014
Two communities: Linked Data & Digital
Preservation
Plato and Aristotle. Fragment of
fresco “the School of Athens” by
Raphael (1509-1510)
Only sensorial
experience can lead
to knowledge.
Pointing to the earth
(realism)
Applied mathematical
methods leads to
knowledge.
Pointing to heaven
(mystical nature of
the universe)

6. Midterm Workshop, Catania, April 2014
Table of contents of D3.1
1. Introduction
2. Definitions and terminology
3. Relevant dimensions addressed by DP projects
4. Initial ideas on preserving Linked (Open) Data
5. Use cases
– Cedar
– Dbpedia
– Europeana
6. Conclusions
7. Bibliography

7. Midterm Workshop, Catania, April 2014
Definitions and terminology

8. Midterm Workshop, Catania, April 2014
Digital Preservation
Long Term Preservation as defined by the OAIS
reference model:
Components:
• Long Term
• Independently Understandable
• Designated Community
• Authenticity
• Information
• Data
• Representation Information
(see page 15)

9. Midterm Workshop, Catania, April 2014
Threats to digital preservation

10. Midterm Workshop, Catania, April 2014
The obvious slide on data

11. Midterm Workshop, Catania, April 2014
Linked (Open) Data
• Use the Web as a platform to publish and re-use
identifiers that refer to data
• Use a single data model for expressing the data
(RDF)
• 3 ways to publish RDF data:
– As annotation to Web documents (RDF data included within the HTML
code of the Web)
– As Web documents (RDF documents are served next to HTML documents)
– As a database (“triple stores”, query language: SPARQL)
(see page 23 for example related to Dbpedia)

12. Midterm Workshop, Catania, April 2014
Three ways to publish RDF data

13. Midterm Workshop, Catania, April 2014
Relevant dimensions addressed by DP projects

14. Midterm Workshop, Catania, April 2014
What is specific for LOD for the DP community?
• A number of formats (RDF / Triple Store / …)
• No clear boundary
• Dynamic, changes over time
• Unclear ownership

15. Midterm Workshop, Catania, April 2014
DP topics potentially relevant for preservation
of LD objects
• Object classification and validation
• Persistent identifiers
• Audit & Certification / Trustworthy Digital
Repositories

16. Midterm Workshop, Catania, April 2014
Some initial ideas on preserving LOD
• Object classification
• Representation information -> Representation
network
• (Persistent Identifiers)
• (Audit & Cetification of TDR)

17. Midterm Workshop, Catania, April 2014
Classification of objects
•must at least make sure we
consider different types of
data
– rendered vs non-rendered
– composite vs simple
– dynamic vs static
– active vs passive
RDF Triple: dynamic/complex/non-rendered/passive
(page 38)

18. Midterm Workshop, Catania, April 2014
OAIS Information model:
Representation Information
The Information Model is key
Recursion ends at
KNOWLEDGEBASE of
the DESIGNATED
COMMUNITY
(this knowledge will
change over time
and region)
Does not demand that
ALL Representation
Information be
collected at once.
A process which can
be tested

19. Midterm Workshop, Catania, April 2014
Use Cases
• CEDAR
• Dbpedia
• Europeana

20. Midterm Workshop, Catania, April 2014

21. Midterm Workshop, Catania, April 2014
Thank you