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Steffen Hennicke Presentation DM2E Kick-Off
 

Steffen Hennicke Presentation DM2E Kick-Off

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  • First a few words about the envisioned information architecture of Europeana: This is how the information space of Europeana will be restructured : At the “bottom” we have the objects which are provided to Europeana. Above we have the “Semantic Data Layer” which is new. It contains various kinds of KOSs with knowledge about people, places, concepts, and so on. These concepts are linked to the objects below and thereby contextualize and enrich them.
  • The data provided to Europeana will come from many different kinds of domains like libraries, archives, or museums. They all will provide their specific collections and KOSs . That will naturally result in „isles of information“ . In order to make the data interoperable the concepts of the various KOSs in the Semantic Data Layer will be aligned , that means they will be connected via cross-vocabulary links . This technically enables applications to navigate through a semantic layer of concepts from different sources and to use it to access objects which are originally described by different but semantically related concepts.
  • Europeana intends to connect to the Linked Open Data community. In the Linked Open Data cloud we find many more knowledge sources like Dbpedia, Geonames, or Library of Congress Subject Headings. Europeana wants to use them to further contextualize and enrich the objects in its information space. At the same time Europeana wants to make its own data available to other communities. The EDM is crucial for realizing this vision. [ LOD cloud July 2009 ]
  • EDM re-uses three ontologies all of which are defined as a RDFS model. SKOS SKOS is an ontology to model KOS (vocabularies) in the Semantic Data Layer of Europeana. It specifically enables cross-vocabulary matching between concepts. Dublin Core Dublin Core is used to describe the core features of culture objects. ESE uses “old” Dublin Core Element Set. EDM uses “new” Dublin Core Metadata Terms which are specializations of the 15 “old” Dublin Core Elements. The use of DC Terms ensures backward compatibility to ESE. OAI ORE The typical record about an object provided to Europeana will included several information pieces: e.g. with descriptive metadata, views (thumbnails, video files, audio files, text documents etc.), links to landing pages etc. OAI ORE allows us to group and organize these information pieces: the abstract “provided object” (Object), the descriptive metadata (Proxy), any “view” of the provided object (Digital Representation).
  • Mona Lisa as described and depicted by the French ministry of culture (Directions des musees de France)
  • This is the metadata record of the French ministry of culture modeled in EDM. Each bubble represent a resource. In the bubble you have the class of the resource (its type) in italics and beneath the URI of the resource which identifies it. The arrows are the semantic links (the properties) between the resources. If there are two properties then the one below is the sub-property of the other one with a more specific meaning. First we have the Aggregation node which groups together all information pieces delivered by the Ministry. It aggregates the node representing the physical object “Mona Lisa”, the digital representations of the Mona Lisa, and the proxy node which is specific to a given provider, and is used to represent the description of the provided object, as seen from the perspective of that specific provider. This is how every metadata record provided to Europeana will look like in its basic form. Why manage central nodes for provided objects? The ORE model says so: an ORE proxy has to be proxy for some "view- independent" resource. Users are looking for (real world) objects (the painting Mona Lisa) and not for the specific view on it of Louvre, or Jaconde (of which they normally do not know anyway). So the approach is: Find the object first (PhysicalThing) and then proceed to the specific views on it. This is also the LOD approach.

Steffen Hennicke Presentation DM2E Kick-Off Steffen Hennicke Presentation DM2E Kick-Off Presentation Transcript

  • Europeana Data Model Berlin, HU-Berlin 1.03.2012Steffen HennickeHumboldt-Universität zu Berlin / School of Library and Information ScienceSteffen.hennicke@ibi.hu-berlin.de 1
  • ESE“Europeana Semantic Elements” (ESE)Created for 2008 version of Europeanaenforces interoperability by converting datasets to a Dublin-Core like “flat” representation“simple and robust” but: original metadata is not visible anymore no specializations to finer-grained models no connections to external (open data) resourcesProbably shouldnt have been called “semantic” :-) Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 2
  • ESE ...<...xmlns:europeana="http://www.europeana.eu/schemas/ese/“...<!--National Library of Poland--><record> <dc:identifier>urn:repox.bn.org.pl:polona:oai:www.polona.pl:4445</dc:identifier> <europeana:uri>http://www.europeana.eu/resolve/record/01406/18A8F5DFCAE75694A 8AAD18E2791861FBE92589A</europeana:uri> <dc:title>[Ośmiu powstańców uzbrojonych w kosy]</dc:title> <dc:subject>Powstanie 1863 r. styczniowe - ikonografia</dc:subject> <dc:date>[1863-1864]</dc:date> <dc:rights>Biblioteka Narodowa</dc:rights> <europeana:object>http://193.59.172.16/szzz/IsShownBy.do? id=6481</europeana:object> <europeana:isShownAt>http://193.59.172.16/szzz/ShowStart.do? id=6481</europeana:isShownAt> </record> Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 3
  • EDM“Europeana Data Model” (EDM)preserves original data while still allowing for interoperabilityuses Semantic Web representation principles: RDF(S)ESE “application profile” of EDM (backwards compatibility)is about to replace ESE (LoD prototype in parallel to ESE based portal) Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 4
  • … and the Big Picture:The Semantic Data Layer Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 5
  • The Semantic Data Layers of information“ by connecting objects from different domains via cross-vocabu library museum archive Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 6
  • EDM and Linked Open DataContext DataDBpediaGNDGeonamesLCSH… Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 7
  • EDM and StandardsSimple Knowledge Organization System (SKOS) Models the KOSs in the Semantic Data Layer of Europeana. Allows for matching between KOSs.DCMI Metadata Terms Used for a core of semantically interoperable properties for descriptive metadata about an object. Ensures backwards compatibility to ESE.Open Archives Initiative Object Reuse & Exchange (OAI ORE) Organizes the metadata about an object in Europeana: Provided Object: Represents the described object of interest. Digital Representation: Some digital view of the object. Proxy: Description of the provided object from one given perspective. Aggregation: Groups all information pieces together. Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 8
  • EDM: Classes Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 9
  • EDM: Properties Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 10
  • Mona Lisa: Joconde Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 11
  • Metadata Record in EDM Digital Representations Described ObjectAggregation Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 12
  • Semantic Enrichmentedm:Agent: persons or organizationsedm:Place: spatial entitiesedm:TimeSpan: time periods or datesskos:Concept: entities from KOS Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 13
  • Event-Centric ModelingPreserving and exploiting original data also means being compatiblewith descriptions beyond simple object level (→ CIDOC CRM!) Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 14
  • Specializationsrdfs:subPropertyOfrdfs:subClassOf generic statement (level of EDM) specific statement Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 15
  • Mona Lisa: Louvre Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 16
  • Proxies Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 17
  • Linking/Complex ObjectsPart-whole links for complex (hierarchical) objectsOrder among parts of objectsDerivation and versioning relations Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 18
  • Current State of EDMConfirmed feasibility in community workshops (archives, libraries, audiovisual archives, museums)LOD-Prototype http://data.europeana.eu At launchtime had 3,5 millions of the 19 million objects represented in Europeana – a coalition of the willing :) Integration of additional contextualisation links ongoing (GeoNames, VIAF, DBPedia) Available as RDF dump Credits to Bernhard Haslhofer (U Wien), Antoine Isaac (Europeana Foundation), Cesare Concordia (CNR IST) and many more ... Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 19
  • PointersEDM Specifications and Primer http://version1.europeana.eu/web/europeana- project/technicaldocuments/Martin Doerr, Stefan Gradmann, Steffen Hennicke, Antoine Isaac, Carlo Meghini, Herbert van de Sompel: The Europeana Data Model. IFLA 2010 (Gothenburg). http://www.ifla.org/files/hq/papers/ifla76/149-doerr-en.pdf Europeana Data Model Steffen Hennicke. HU-Berlin, DM2E-Kick-Off, 1./2. March 2012. 20