Presentation during the 2016 American Library Association (ALA) Annual Conference in Orlando (Florida), given at the ALCTS Program "Linked Data - Globally Connecting Libraries, Archives, and Museums", Sponsor: ALCTS International Relations Committee, Co-Sponsor: Linked Library Data Interest Group

1. 1
Linked Data
at the German National Library
Reinhold Heuvelmann

2. Overview
1. Basis: Data Management at DNB
2. Linked Data Service
- Features
- Infrastructure
- Maintenance
- Data Modeling Workflows
- Usage
- Future
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 20162

3. We work to position the DNB
as an important navigation aid
in the cultural heritage graph
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 20163
PhotobyNicoKaiser(CC-BY):
http://www.flickr.com/photos/nicokaiser/4667377944/sizes/z/in/photostream/

4. Metadata turntable
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 20164
ILS
internal
format
Pica
IN OUT
Manual
cataloguing
Machine
processing
Import:
MARC 21
ONIX
XMetaDissPlus
JATS
MARC 21
ONIX
MODS
Dublin Core
Linked Data
BIBFRAME

5. Traditionally high link density
5
"Work-
stance"
Part
"Work-
stance"
Whole
Work Person
"Workstance":
Work+Instance
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 2016

6. Linked Data Service
- Datasets and profiles -
Authority data
Gemeinsame Normdatei
(GND)
Profiles
• GND Ontology
• Entity Facts
Bibliographic data
German National
Bibliography
Profiles
• DINI AG KIM
• BIBFRAME (Prototype)
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 20166
Established
2 0 1 0

7. Linked Data Service
- Figures -
– Bibliographic data (DINI-KIM Profile)
218 million triples*
Ø 17,5 triples per title
Dump size 15 GB**
– Authority File GND (GND Ontology)
131 million triples*
Ø 11,5 triples per entity
Dump size 11 GB**
* as of January 2016 **RDF Serialization Turtle
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 20167

8. … just another export format
– Persistent and dereferencable URIs: http://d-nb.info/
- Identification: http://d-nb.info/1002535506
- Description: http://d-nb.info/1002535506/about/lds
- Content negotiation
– Data dumps
– Retrieval API: SRU
– Harvesting: OAI-PMH
– DNB Data Shop
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 20168

9. Linked Data Service
- Unique Features -
– Target audience: non-library users, web context
– Enrichments with links to/from external sources
– 3 Serializations
- RDF/XML
- Turtle
- JSON-LD
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 20169

10. Conversion Seriali-
sation
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201610
ILS
Data Conversion Service
Conversion
I
n
d
e
x Enrichment
Database
Wikidata
d-nb.info
data dumps
SRU
OAI
DNB Data
Shop
VIAF
Classification
Alignments
GND-ID-Lists
Linked Data Service
- Infrastructure -

11. What does it mean to be an export format?
– Documentation
- Application profiles, Element sets
- Release changes notes
– Continuous development of infrastructure,
application profiles
– Channels for communication, user services
- lds@lists.dnb.de
- Data service
– Fixed release cycle
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201611

12. What needs to be done regularly?
– Application Profile maintenance
- e.g. with introduction of RDA
- ongoing extension
- towards completeness (bibliographic data)
- provenance
– Links to external resources
- identification of new targets (and sources)
- updating from link sources
– Validation / Data quality
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201612

13. Focus: Data modeling workflows
- GND Authority data -
GND Ontology – focus: completeness
– Custom-made element set
- New elements introduced as source advance
- For native RDF data usage
- Maintaining alignments to other well established element sets
Entity Facts – focus: keeping it simple
- Mainly subsection of GND Ontology
- For direct usage: display, indexing
- Requirement driven
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201613

14. Focus: Data modeling workflows
- Bibliographic data -
Competence center for interoperable metadata
(DINI AG KIM)
– Sub working group publishes
recommendations on the RDF representation
of bibliographic data
– Agreement of German speaking
Linked Library Data providers and stakeholders
i.e. library networks, national libraries
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201614

15. DINI AG KIM - involvement
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201615
lobid.org lod.b3kat.de
lod.hebis.de
dnb.de/lds
ld.zdb-
services.de

16. | Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201616
(German)

17. The DINI AG KIM profile
– Flat data model
– Mixture of multiple element sets, applied as assumed
most widely understood:
- RDF Schema
- Web Ontology Language
- Dublin Core
- Bibliographic Ontology
- RDA unconstrained
- schema.org
- …
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201617

18. BIBFRAME Profile
– Project status
– Prototype
– focus: gaining experience and supporting/triggering
discussion
– update on BIBFRAME 2.0 projected
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201618

19. Next Steps
&
Future Development
19

20. Step 1: More data
Goal: publish the complete national bibliography as
linked data:
– Musical scores
– Recordings of music
– …
– At a later stage, we might continue with museum and
archive collections
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201620

21. Step 2: More metadata
Goal: Increase visibility of the datasets
 Implement and publish dataset descriptions using
DCAT, VoID and ADMS
 not only for RDF, but also for MARC 21
 to be included in datahub d-nb.info
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201621

22. Step 3: More links
Goal: Enable cross-domain, cross-language and
cross-institution discovery
 Publish all links between subject vocabularies
 Create and publish links between national bibliographies
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201622

23. … and beyond ...
– Linked Data API (lookup services?, SPARQL endpoint?)
– RDF @ DNB Portal (schema.org descriptions in HTML)
– Negotiating shapes/profiles over HTTP
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201623

24. Usage
24

25. Deutsche Digitale Bibliothek
Person and organization pages
Integrated Authority File (GND)
Profile Entity Facts, JSON-LD
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201625

26. | Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201626

27. | Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201627

28. | Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201628

29. | Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201629
museum-digital
Integrated Authority File (GND)

30. | Reinhold Heuvelmann | Linked Data at the German National Library | June 25 2016

31. | Reinhold Heuvelmann | Linked Data at the German National Library | June 25 2016

32. filmportal.de
GND Participant: Updates in RDF
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201632

33. Filmportal
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201633

34. German National Bibliography:
"Empirical Data on Over-length Books"
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201634

35. | Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201635
Fun with data!*
*not to be taken too seriously due to data and processing imperfections …

36. Contact and Support
Product manager Linked Data Service:
Jana Hentschke
j.hentschke@dnb.de
Website:
http://www.dnb.de/EN/lds
http://www.dnb.de/EN/entityfacts
Mailinglist:
lds@lists.dnb.de
| Reinhold Heuvelmann | Linked Data at the German National Library | June 25 201636
Thank you!