1. Martin Malmsten
Head of Software Development
Libris dept., National Library of Sweden
Tuesday, August 14, 12

2. Libris - the Swedish Union
Catalogue
Contribute what is unique to
you, but gain access to all data
Tuesday, August 14, 12

3. Swedish Union Catalogue available as Linked
Data (RDF) since 2008
The National Library of Sweden released the
National Bibliography and Authority file
(MARC21) with a CC0 license in 2011
LIBRIS is building a new catalogue backend
with SemWeb as a key technology
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12. Open National
Bibliography
• Swedish National Bibliography and Authority File
released, in original format (MARC21), with a CC0
license
• Goal is to have the whole of LIBRIS released with CC0
Tuesday, August 14, 12

13. Why CC0?
With 90 persons in this room, every minute I spend
talking about licenses is 1.5 hour not spent on
actually using data
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19. A next, next, (next?)
generation
catalogue
• Format agnostic (MARC21, EAD, TEI, etc.)
• SemWeb technology a first class citizen
• Transition to RDA
Tuesday, August 14, 12

20. Either aggregate all data OR be able to cope
with the fact that data is created, updated and
deleted “elsewhere”
Tuesday, August 14, 12

21. Three or four big aggregates of Linked Data is
not a web
Tuesday, August 14, 12

22. Challenges
Building a big, networked, distributed graph poses some
challenges, for example:
1) Who to trust?
2) Seamlessness - you often need to react to changes in other
datasets, not only import data
Tuesday, August 14, 12

23. Dealing with change
1) Atom feeds
2) OAI-PMH
3) No dumps - but you are free to create your own
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26. Dealing with change
3) pubsubhubbub
4) ResourceSync
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28. Conclusion
1) Actually using/consuming Linked Data, as opposed to only
exposing it, removes the technical distinction between
internal and external datasets.
2) Control becomes at matter of trust, not technology
3) The record disintegrates* as the data becomes distributed.
*pssssst, and is possibly replaced by something called named graphs
Tuesday, August 14, 12

29. Linked Data
Contribute what is unique to
you, but gain access to all data
Tuesday, August 14, 12