steffen hennicke edm-wp2march28

The Europeana Data Model

Largely based on the slides by Antoine Isaac

with input from Carlo Meghini, Guus Schreiber,

Stefan Gradmann, Makx Dekkers et al. from

Europeana v1.0

Talk by Steffen Hennicke (HU-Berlin) DM2E, WP2 Modeling Workshop, March 28th @ FU Berlin

“Europeana Data Model”

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EDM vs. ESE

Challenge for Europeana: (Rich) Integration of heterogeneous

CH-metadata.

Precursor of EDM: Europeana Semantic Elements (ESE)

• Used in first version of Europeana

• Represents lowest common denominator for object metadata

Converts datasets to Dublin-Core like “flat” standard

• Forces interoperability

“Simple and robust” approach but

Original metadata is lost

No easy connection to external contextualization resources

“Europeana Data Model”

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ESE Metadata Record

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EDM Requirements & Principles

1. Distinction between “provided objects” (painting, book, movie, etc.)

and their digital representations

2. Distinction between “provided objects” and metadata records

describing an object

3. Allow for multiple records (“views”) on one object, containing

potentially contradictory statements about it

4. Support for objects that are composed of other objects (“complex

objects”)

5. Compatibility with different levels of description

6. Standard metadata format that can be specialized

7. Support for contextual resources, including concepts from controlled

vocabularies

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EDM and other Ontologies

Using Semantic Web representation principles (RDF)

• Re-use and mix different vocabularies together

• Preserve original data and still allow for interoperability (Req. 6)

• OAI ORE (Open Archives Initiative Object Reuse & Exchange) for

organizing an object’s metadata and representation(s)

• Req. 1-4

• Dublin Core for descriptive metadata representation

• Req. 5

• SKOS (Simple Knowledge Organization System) for conceptual

vocabulary representation

• Req. 7

• Some constructs are inspired by CIDOC-CRM

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EDM “Core Pattern”

A data provider submits to Europeana a logical “bundle” of an

object plus its digital representation(s).

The Aggregation organizes data of a provider.

the „complex construct“

of related resources

(e.g. metadata record)

the „described object“ or

„object of interest“

any „view“ related to the CHO

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Complex Library Data

• METS with MODS

• Metadata about digitized „historical printings“

“Europeana Data Model”

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METS-File

Digital

Representations

Descriptive

Metadata

Administrative

Metadata

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Logical Structure

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Object Representation

„Described Object“

(Monograph)

Aggregation (Metadata Record),

first level

<mets:div ADMID="AMD" DMDID="DMDLOG_0000" ID="LOG_0000" LABEL="Dissertationum

Exegeticarum De Melchisedeco" TYPE="Monograph">

“Europeana Data Model”

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Provenance Metadata

Provenance of representations

and description

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Descriptive Metadata

(in MODS)

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WebResource

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Descriptive Metadata

(in MODS)

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Decriptive Metadata

Object-Centric Modelling

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Contextual Entities

edm:Agent: persons or organizations

edm:Place: spatial entities

edm:TimeSpan: time periods or dates

skos:Concept: entities from KOS

(edm:PhysicalThing)

(edm:Event)

Representing (real-world)

entities related to a provided

object as fully fledged

resources, not just strings.

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Descriptive Metadata

Event-Centric Modelling

generic statement (level of EDM)

specific statements

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Complex Objects

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Double Hierarchy

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Complete Double Hierarchy

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Proxies

Representing different metadata for a same object

allowing for different and possibly conflicting on one object

“views”, i.e. “context-specific” data

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Proxies

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Proxies

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Europeana

• Europeana is “just” a special provider

with processed/enriched metadata

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EuropeanaAggregation

Europeana

Aggregation

enriched metadata object page on Europeana portal

Europeana’s Proxy

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Archival Finding Aids

• „Encoded Archival Description“ (EAD)

• APEnet EAD

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Visual

Representation

of a Finding Aid

of the Dutch

Nationaal Archief

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Digitized Page of

an archival item

(which is

described in the

finding aid).

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“Europeana Data Model”

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Summing up EDM constructs

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Classes for the “Core Pattern”

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Properties for the “Core Pattern”

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Classes for Contextual Entities

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Properties for Descriptive Metadata

(without most ESE/DC Properties)

Blue: simple object-centric description

Red: rich description of events, persons, etc

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Properties for Relations

between provided CHO

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Classes for

Context-Specific Metadata

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Properties for

Context-Specific Metadata

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Current Status of EDM

• There will always be potential enhancements to EDM

• Important: we now have a stable version, so issues and new

features have quite clear bounds

• Confirmed feasibility in community workshops (Archives, Libraries, AudioVisual, Museums)

• Closely articulated with Danube requirement process

• First batches of EDM data

• Europeana Linked Data pilot (data.europeana.eu)

• Projects: MIMO, CARARE…

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ESE, EDM and Data Providers’

Duties & Benefits

• EDM is backwards compatible with ESE

• Object metadata described in ESE can be ingested and used in Europeana Danube release

• Direct conversion of object data to EDM has benefits

• Closer to original metadata

• Data can be contextualized, semantically linked to other data

• Allows for richer semantic query expansion & cross-collection browsing

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Documentation

Main documentation:

• EDM Definitions

• EDM Primer

• EDM Mapping guidelines for data providers

http://pro.europeana.eu/edm-documentation

Other resources:

• EDM object templates & XML schema

http://europeanalabs.eu/wiki/EDMXMLSchema

• EDM OWL ontology

http://europeanalabs.eu/browser/europeana/trunk/ROOT/src/main/webapp/schemas/edm/rdf/

• ESE2EDM conversion for Europeana Linked Data pilot

http://europeanalabs.eu/wiki/EDMPrototypingTask15