Building an ecosystem of networked references
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The document discusses Europeana's efforts to build an ecosystem of linked data references to enhance user experience by improving data interlinking, context, and language coverage. It outlines the Europeana data model, the creation of an 'entity collection' for centralized access to contextual data, and the integration of vocabularies like DBpedia for enhanced metadata accuracy. The roadmap for future developments includes generating Europeana URIs, making data accessible through APIs, and improving alignment with local vocabularies and other external sources.
Building an ecosystem of networked references
- 1. Building an ecosystem of networked references Hugo Manguinhas | DBpedia Community Meeting 2016
- 2. Europeana has many data challenges Building an ecosystem of networked references CC BY-SA We aggregate very heterogeneous metadata: • More than 48M objects • 3,500 galleries, libraries, archives and museums • 50 languages • From all EU countries • Level of quality varies greatly • Huge amount of references to places, agents, concepts, time
- 3. Europeana Linked Data Strategy Motivation Building an ecosystem of networked references CC BY-SA • Improve user experience • support better ways of searching and navigating through the collections, eliminating ambiguity and clarifying the meaning of descriptions • better adapt to the language of the user • by improving the interlinking of data • brings more context to the objects • alleviates polysemy issues • better language coverage • Contributes to build a web of data ('knowledge graph') that third parties can use to improve their users' experience
- 4. Europeana Linked Data Strategy Our efforts and lines of work Building an ecosystem of networked references CC BY-SA • Europeana Data Model (EDM) offers a base for linking data • We apply an enrichment strategy to link source data to reference data, incl. DBpedia • Encourage data providers to contribute their own vocabularies so that we can benefit from data links made at data providers’ level • We encourage alignment activities between domain vocabularies
- 5. Europeana Linked Data Strategy Vocabularies currently provided to Europeana CC BY-SA Building an ecosystem of networked references
- 6. Europeana Linked Data Strategy Europeana also hosts vocabularies CC BY-SA Building an ecosystem of networked references
- 7. Europeana Linked Data Strategy A strategy for Entities Building an ecosystem of networked references CC BY-SA • As a cornerstone for our strategy we are building an "Entity Collection" • A service that acts as a centralized point of reference and access to data about contextual entities • Caching and curating data from the wider Linked Open Data cloud • A sort of Europeana "knowledge graph"
- 8. The Entity Collection Use Cases CC BY-SA Building an ecosystem of networked references Europeana Collections Portal ● Findability: users can look for entities, not only records (Entity-Based Search) ● Understandability: Entity Pages group and present all assertions about an entity ● Exploration: Navigation along relationships becomes possible Crowdsourcing ● Objects can be annotated with references to entities ● A controlled vocabulary for client applications Enrichment of Provider’s Data ● A controlled vocabulary to help identify named references to entities Republication for Re-use ● Entities can be republished as an open source to the community Entity Collection
- 9. The Entity Collection Why DBpedia? CC BY-SA Building an ecosystem of networked references • It offers labels in about 124 languages through all its language editions of which 48 match the languages that Europeana supports • It gives fairly complete and accurate descriptive metadata about entities • Works great as a “pivot” vocabulary, providing further links to other vocabularies such as Wikidata and Freebase
- 10. Entity Collection The Entity Collection Integrating DBpedia resources CC BY-SA Building an ecosystem of networked references RDF dumps 48 Language Editions (~3.6GB/GZ) http://data.dws.informatik.uni- mannheim.de/dbpedia/2014/ Triple Store MongoDB SPARQL Dumps were carefully selected and downloaded for all languages that Europeana supports... SPARQL queries select DBpedia resources for each EDM Contextual Class Each DBpedia resource is converted to EDM using XSLT and further filtered loaded...
- 11. The Entity Collection Some statistics for DBpedia CC BY-SA Building an ecosystem of networked references Entity Class Target vocabulary Size Places GeoNames 140,097 Concepts DBpedia 5,284 GEMET 280 Agents DBpedia 161,209 Time Semium Time 2,566
- 12. The Entity Collection DBpedia resource for “Mozart” in our data CC BY-SA Building an ecosystem of networked references <http://dbpedia.org/resource/Wolfgang_Amadeus_Mozart> a <http://www.europeana.eu/schemas/edm/Agent> ; skos:prefLabel "वोल्फ़ग ांक आमडेयुस मोत्स र्ट"@hi, "Волфганг Амадеус Моцарт"@sr, "Волфганг Амадеус Моцарт"@mk, "Волфганг Амадеус Моцарт"@bg, "Вольфганг Амадэй Моцарт"@be, "Βόλφγκανγκ Αμαντέους Μότσαρτ"@el, "Моцарт, Вольфганг Амадей"@ru, "Volfgangs Amadejs Mocarts"@lv, "Wolfgang Amadeusz Mozart"@pl, "볼프강 아마데우스 모차르트"@ko, " וואלפגאנגאמאדעוסמאצארט "@yi, "Volfqanq Amadey Mosart"@az, "Вольфганг Амадей Моцарт"@uk, "Wolfgang Amadeus Mozart"@nl, "Wolfgang Amadeus Mozart"@es, "Wolfgang Amadeus Mozart"@et, "Wolfgang Amadeus Mozart"@en, "ვოლფგანგ ამადეუს მოცარტი"@ka, "Wolfgang Amadeus Mozart"@de, "Wolfgang Amadeus Mozart"@ga, "Wolfgang Amadeus Mozart"@bs, "Wolfgang Amadeus Mozart"@hu, "Wolfgang Amadeus Mozart"@no, "Wolfgang Amadeus Mozart"@tr, "Wolfgang Amadeus Mozart"@ca, "Wolfgang Amadeus Mozart"@ro, "Wolfgang Amadeus Mozart"@hr, "Wolfgang Amadeus Mozart"@gd, "Wolfgang Amadeus Mozart"@gl, "Wolfgang Amadeus Mozart"@cs, "Wolfgang Amadeus Mozart"@cy, "Wolfgang Amadeus Mozart"@sq, "Wolfgang Amadeus Mozart"@it, "Wolfgang Amadeus Mozart"@is, "Wolfgang Amadeus Mozart"@eu, "Wolfgang Amadeus Mozart"@da, "Wolfgang Amadeus Mozart"@sk, "Wolfgang Amadeus Mozart"@sl, "Wolfgang Amadeus Mozart"@fr, "Wolfgang Amadeus Mozart"@sv, "Wolfgang Amadeus Mozart"@fi, "Wolfgang Amadeus Mozart"@pt, "Volfgangas Amadėjus Mocartas"@lt, "ヴォルフガング・アマデウス・モーツァルト"@ja, "Վոլֆգանգ Ամադեուս Մոցարտ"@hy, " וולפגנגאמדאוסמוצרט "@he, " فولفغانغ أماديوسموتسارت "@ar, "沃尔夫冈·阿马德乌斯·莫扎特"@zh ; skos:altLabel "Mozart, Johann Chrysostom Wolfgang Amadeus"@en, "Mozart, Wolfgang Amadeus"@en ; dc:identifier "32197206" ; rdaGr2:placeOfBirth <http://dbpedia.org/resource/Austria>, <http://dbpedia.org/resource/Salzburg> ; rdaGr2:placeOfDeath <http://dbpedia.org/resource/Vienna>, <http://dbpedia.org/resource/Austria> ; edm:end "1791-12-05" ; rdaGr2:dateOfDeath "1791-12-05" ; rdaGr2:dateOfBirth "1756-01-27" ; rdaGr2:biographicalInformation … ; owl:sameAs <http://en.dbpedia.org/resource/Wolfgang_Amadeus_Mozart>, <http://zitgist.com/music/artist/b972f589- fb0e-474e-b64a-803b0364fa75>,<http://wikidata.org/entity/Q254>, <http://www4.wiwiss.fu- berlin.de/gutendata/resource/people/Mozart_Wolfgang_Amadeus_1756-1791>, <http://sw.cyc.com/concept/Mx4rvlD9e5wpEbGdrcN5Y29ycA>, <http://yago- knowledge.org/resource/Wolfgang_Amadeus_Mozart>, <http://wikidata.dbpedia.org/resource/Q254>, <http://rdf.freebase.com/ns/m.082db> … . Preferred labels for 48 languages Coreference links to 6 other datasets (e.g. Freebase, Wikidata) Inter-linking information
- 13. The Entity Collection Is DBpedia enough? CC BY-SA • Not enough coreferencing information to other vocabularies • particularly to the ones we receive from data providers (e.g. MIMO) • Labels and values are not always accurate and normalized • need for better reference data (e.g. VIAF) Building an ecosystem of networked references
- 14. The Entity Collection Our roadmap for the next years CC BY-SA Building an ecosystem of networked references • Generate Europeana URIs for Entities • Make entity services and data available via an API, and further integrate existing components • Integrate vocabularies that can further improve • entity descriptions and multilingual coverage (e.g. VIAF) • linking between entities (e.g. Wikidata) • Integrate alignments • particularly, links between local/domain vocabularies to pivot vocabularies
- 15. Linking Metadata to MIMO with CultuurLink About CultuurLink CC BY-SA Building an ecosystem of networked references • Online tool for aligning SKOS vocabularies, http://cultuurlink.beeldengeluid.nl • Successor to EuropeanaConnect's Amalgame • Developed by Spinque • With support of the Network Digital Heritage • Semi-automatic discovery of alignments • Ability to define complex strategies • Manual assessment and export of the results
- 16. Linking Metadata to MIMO with CultuurLink The Europeana Sounds Experiment CC BY-SA Building an ecosystem of networked references • Scope • Evaluate MIMO as target vocabulary for enrichment of subject fields • Evaluate the potential of CultuurLink for alignment of vocabularies • Participants • British Library, CREM, MMSH, NISV (6 collections in total) • Work done • A SKOS vocabulary was generated for each collection from the labels found within subject fields • Each participant used CultuurLink to discover alignments by designing and testing different strategies
- 17. Linking Metadata to MIMO with CultuurLink Example from CNRS CC BY-SA Building an ecosystem of networked references see http://cultuurlink.beeldengeluid.nl
- 18. Linking Metadata to MIMO with CultuurLink Results of the experiment CC BY-SA Building an ecosystem of networked references • There were a couple of issues with metadata quality • matching previous observations: enrichment works better when metadata quality is good • The feedback was positive for CultuurLink • Applying different strategies showed to be crucial for discovering alignments between concepts • ... taking into account different features of the data (prefered / alternative labels, different languages, vernacular labels, etc.) • Providers have realized the interest and feasibility of linking to a richer, more multilingual pivot vocabulary such as MIMO
- 19. Linking Metadata to MIMO with CultuurLink Demo CC BY-SA Building an ecosystem of networked references http://cultuurlink.beeldengeluid.nl
- 20. Conclusion CC BY-SA Building an ecosystem of networked references • A Strategy for Entities is a “must” for Europeana • There is no “one fits all” vocabulary • We have a long way to go… • ...but we are making progress