Amsterdam museum as five star linked data
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Amsterdam Museum as
Five-star Linked Data
Judith van Gent Victor de Boer
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Collection Amsterdam Museum– More than 75.000 objects
paintings, drawings, prints, coins, statues, photos, glass, silver, furniture, ceramics, books, historic interiors, costumes, textiles, clocks, shoes, etc.
– Around 20% on show, rest in storage depots
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Collection Amsterdam Museum– of the Amsterdam people– of international importance– sharing data/knowledge is policy
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2010 AM entire collection online• digital depot • CC BY-SA• not all data optimal • public can react/contribute
collectie.ahm.nl
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AM open data– Use and reuse!– Adlib database open
– Adlib API (XML output)– OAI-PMH (XML, Dublin Core)– Linked Open Data (VU EDM)
– Metadata / images– Spectrum, Dublin Core, Texts
– Persistent id i.o.– id.amsterdammuseum.nl/collection/123
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• OAI protocol– Digitalecollectie.nl > Europeana– ED*IT– Oneindig NH
• Wikipedia• Adlib API
– iPhone app– Apps for Amsterdam
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“Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/”
Linked Data
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Why linked data (1/2)
Slide stolen from Christophe Gueret
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Why linked data (2/2)
Slide stolen from Christophe Gueret
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Europeana• “Europeana enables people to explore the digital
resources of Europe's museums, libraries, archives and audio-visual collections.’’
www.europeana.eu
From portal… …to data aggregator.
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AM metadata• Adlib database XML API
• Object metadata • 73.000 objects, 256MB • Nested XML
• Concept Thesaurus• 27.000, 9MB• Different types (geo,motif, event)
• Person ‘Thesaurus’• 67.000 persons, 10MB• Consolidated from object metadata fields• Creators, annotators, reproduction
creators, institutions,
<record priref="10541“ > <acquisition.date>1997</acquisition.date> <dimension> <dimension.type>hoogte</dimension.type> <dimension.unit>cm</dimension.unit> <dimension.value>6</dimension.value> </dimension> …</record>
<record priref="28024“ > <term>Kalverstraat 124</term> <broader_term>Kalverstraat</broader_term> <term.type>GEOKEYW </term.type> </record>
<record priref="6" > <biography>boekverkoper en uitgever van cartografie</biography> <birth.date.start>1659</birth.date.start> <death.date.start>1733</death.date.start> <name>Aa, Pieter van der</name> <nationality>Nederlands</nationality> <use>Aa, Pieter van der (I)</use> </record>
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Four rules of 5-star Linked Data
1. Use URIs as names for things
2. Use HTTP URIs so that people can look up those names.
3. When someone looks up a URI, provide useful information, using the standards (RDF*, SPARQL)
4. Include links to other URIs. so that they can discover more things.
http://www.w3.org/DesignIssues/LinkedData.html
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Amsterdam Museum URIs• PURL basename: http://purl.org/collections/nl/am/
• Objects: Use “prirefs”, prefixed by “proxy-”– http://purl.org/collections/nl/am/proxy-63432
• Concepts & Persons: Use “prirefs”, prefixed by “p-”, or “t-” – http://purl.org/collections/nl/am/p-201
• Properties (schema): Use XML element name – http://purl.org/collections/nl/am/acquisition.date
PS: am:p-1234 is a shorthand for http://
purl.org/collections/nl/am/p-1234
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Four rules of 5-star Linked Data
1. Use URIs as names for things
2. Use HTTP URIs so that people can look up those names.
3. When someone looks up a URI, provide useful information, using the standards (RDF*, SPARQL)
4. Include links to other URIs. so that they can discover more things.
http://www.w3.org/DesignIssues/LinkedData.html
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XMLRDF
• Modular setup 1. Start with XML (OAI-harvest)2. Syntactic transformation to RDF3. Rewrite raw RDF using simple rules4. Define mapping schema to EDM/other
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RDF conversion (XMLRDF)<record priref="19319 “ > <date>1651</date> <maker>Rembrandt (1606-1669)</maker> <object.type>etsplaat</object.type> …</record>
am:Record_:bn1
“19319 ”
“1651”
priref
date
am:Personam:p-1234
skos:Conceptam:etsplaat
“1234”
“1606”
am:prirefam:birthdate
“etsplaat”
maker
object.type
“Rembrandt (1606-1669)”
“etsplaat”
am:Recordam:proxy-19319
“19319 ”
“1651”am:priref
am:date
am:maker
am:object.type
“Rembrandt”rda:name
skos:prefLabel
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Mapping schema
am:proxy_22093
1770
1790
am:productiondateStart
am:productiondateEnd
rdfs:subPropertyOf
dcterms:created
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Cliopatria
RDF(s) storage
HTTP server
SPARQL
Prolog
Web interface
SPARQL-app Browser
Logic
Purl.org redirect
http://semanticweb.cs.vu.nl/
6.000.000 RDF triples
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text/html
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<?xml version='1.0' encoding='UTF-8'?> <!DOCTYPE rdf:RDF [ <!ENTITY am 'http://purl.org/collections/nl/am/'> <!ENTITY rdf 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'> <!ENTITY skos 'http://www.w3.org/2004/02/skos/core#'> ]>
<rdf:RDF xmlns:am="&am;" xmlns:rdf="&rdf;" xmlns:skos="&skos;" > <skos:ConceptScheme rdf:about="&am;AM_ConceptScheme"/> <skos:Concept rdf:about="&am;t-1" am:priref="1"> <am:termType rdf:resource="&am;t-termtypeGEOKEYW"/> <am:termType rdf:resource="&am;t-termtypePLACE"/> <skos:broader rdf:resource="&am;t-2688"/> <skos:inScheme rdf:resource="&am;AM_ConceptScheme"/> <skos:prefLabel xml:lang="nl">Wassenaar</skos:prefLabel> </skos:Concept>
<skos:Concept rdf:about="&am;t-10" am:priref="10"> <am:termType rdf:resource="&am;t-termtypeGEOKEYW"/> <am:termType rdf:resource="&am;t-termtypePLACE"/> <skos:broader rdf:resource="&am;t-12"/> <skos:inScheme rdf:resource="&am;AM_ConceptScheme"/> <skos:prefLabel xml:lang="nl">Driebergen</skos:prefLabel> </skos:Concept>
<skos:Concept rdf:about="&am;t-100" am:priref="100"> <am:termType rdf:resource="&am;t-termtypeGEOKEYW"/> <am:termType rdf:resource="&am;t-termtypePLACE"/> <skos:broader rdf:resource="&am;t-12"/> <skos:inScheme rdf:resource="&am;AM_ConceptScheme"/> <skos:narrower rdf:resource="&am;t-31297"/> <skos:prefLabel xml:lang="nl">Naarden</skos:prefLabel> </skos:Concept> <skos:Concept rdf:about="&am;t-1000" am:priref="1000"> <am:termType rdf:resource="&am;t-termtypePLACE"/> <skos:inScheme rdf:resource="&am;AM_ConceptScheme"/> <skos:prefLabel xml:lang="nl">Clos-Lucé</skos:prefLabel> </skos:Concept>
application/rdf+xml
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http://semanticweb.cs.vu.nl/europeana/user/query
SPARQL
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Again, the rules of Linked Data
1. Use URIs as names for things 2. Use HTTP URIs so that people can look up
those names. 3. When someone looks up a URI, provide
useful information, using the standards (RDF*, SPARQL)
4. Include links to other URIs. so that they can discover more things.
http://www.w3.org/DesignIssues/LinkedData.html
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Link to other sources
am:Personam:p-1234
“1234”
“1606”
am:prirefam:birthdateam:Record
am:proxy-19319
“19319 ”
“1651”am:priref
am:date
am:maker
“Rembrandt”rda:name
Viaf:PersonViaf:RebrandtvanRijn
“Dutch”Viaf:nationality
rdfs:label
“Rembrandt Harmensz. Van Rijn”
owl:sameAs (?)
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Amalgame alignment platform
• Semi-automatic linking– Simple automatic techniques, – chained together by hand
• 3500+ links put in RDF– 143 places linked to
GeoNames– 1076 persons linked to ULAN
(VIAF)– 34 persons linked to DBPedia– 2498 concepts AATNed.
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CKAN Data Hub
http://thedatahub.org/dataset/amsterdam-museum-as-edm-lod
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And now applications!…right??
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Plaatsen van BetekenisLocal Linked Data (Amsterdam)
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amsterdammuseum.nlhttp://collectie.ahm.nl/
http://amdata.adlibsoft.com/wwwopac.ashx
http://semanticweb.cs.vu.nl/lod/am/
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EDM
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What kind of RDF?
• Europeana Data Model (EDM)– Keep original metadata intact– Use sem web (LD) principles: RDF
• Re-use of standard models– Dublin Core for metadata representation
• creator, date, title etc.
– SKOS for vocabularies• preferredLabel, hasBroader, etc.
– OAI-ORE to allow for aggregations etc.
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EDM voorbeeld
proxyobject
metadataAggregation
Provenance +web
views/plaatjes
Physical Objectgeen
metadata