LOD Examplar - LOD Museum -

2012 INTERNATIONAL ASIAN SUMMER SCHOOL IN LINKED DATA
IASLOD 2012, August 13-17, 2012, KAIST, Daejeon, Korea

LOD Application Exemplar
- A case study: LODAC Museum

Hideaki Takeda
Fumi Kato
National Institute of Informatics
takeda＠nii.ac.jp
Hideaki Takeda, Fumi Kato / National Institute of Informatics

Aim of this talk
• How to plan, design, and implement LOD?
• Learn from the case


LODAC Project http://lod.ac/
• Open Social Semantic Web Platform for Academic
Resources
– Providing platforms for Linked Open Data
– Practicing data accumulation and publishing

• Interested Areas
– Museum information
– Geographical information, especially geographical names
– Local information
– Taxonomic information on species
– …


Linked Open Data Initiative
• Non Profit Organization
– (Under application for approval)
• Academia + IT People + local people
• Aim: facilitate LOD activities among local
people

http://linkedopendata.jp/

Museum data as LOD
• The state-of-the-art of museum information in
Japan (nearly 6,000 museums in Japan)
– Distributed
• Self maintained
• Isolated
– Opaque
• Self designed
• Messy
• Aggregating and associating museum information
– LODAC-Museum


LODAC Museum – Main work
• Gathering of data
– Thesaurus, museum collections, etc
• Standardization of data
– Representing data from different sources in a
unique form
• Integration of data
– Identifying data
– Associating the same data
• Consuming of data


LODAC Museum Architecture
Consuming of data
Integration of data

SPARQL Import

unicorn(ruby) OWLIM
RDF

SPARQL Standardization of data
Map to RDF
nginx
Gathering of data

thttpd(python)

Crawl / Scrape
ID Management
(MySQL) Ex tracted data
(JSON)
Museum Websites

Semantic MediaWiki


Gathering data
• No museums publish data as LOD!
• We use data published as Web pages
– Scrape and translate data
– License is not clear
• It is a serous problem
• We need permission from every site in principle
• We got permission from some data publishers not all


Dataset
Type No. Data source
Art work ca.80,000 Catalog of the collections of 3 National Art
(lodac:Work) Museum (25,180), National Museum of
Western Art (4,373), Tokushima Pref. Art
Museum (18,482) … over 100 museums
Database for National Treasure & Important
Cultural Property of National Designated (915)

The Japanese Art Thesaurus (266)
Specimen ca.1,690,000 (100+ Museum collections)
(lodac:Speciment) Science Net (National Science Museum)
Person (foaf:Person) ca. 8,800 The Japanese Art Thesaurus

Facilities (icls. ca. 200,000 The Japanese Art Thesaurus
Museum) Cultural Heritage Online
GIS data National and Regional Planning
Bureau

Extracting collection data from
museum websites

Extract


Extracting collection data from
museum websites

Extract
Property Value

Property Value

Standardization of data
Re-organized common metadata.
dc:title
crm:P45_consistOf
skos:preflabel

Raw Data .... lodac:era

Re-organized Metadata

Current organized policies
・Use existing metadata
・Define own metadata.

13

Namespaces

Prefix Metadata Name

crm CIDOC-CRM

dc11 Dublin Core 1.1

dc DCMI Terms

skos Simple Knowledge Organization System

rdfs Resource Description Frame Work Schema

foaf Friend of a Friend

rda2 Resource Description and Access

lodac LODAC Project

14

Metadata schema for works
lodac:Work Property
Genre lodac:genre
Type of cultural assets lodac:culturalAssets
Creator dc:creator / dc11:creator
Nationality crm:P7_took_place_at
Title dc:title / skos:prefLabel
Title Pronunciation (yomi) dc:title @ja-hrkt / skos:altLabel
Title in English dc:title @en / skos:altLabel
Inscription crm:P62I_is_depicted_by
Seal crm:P65_shows_visual_item
No. of parts crm:P57_has_number_of_parts
Collection dc:isPartOf
Created year dc:created
Estimated starting year lodac:estimatedStartYear
Material dc:medium / crm:P45_consists_of


Integrating Data
• How to integrate data from different sources
– sharing of responsibility
• Each source is responsible for its data
– Identifying IDs for data and managing data with the IDs
• LODAC is only responsible for integration
– Assigning original IDs and associating other IDs to them

dc:references dc:references

(Ref-resource) (ID-resource) (Ref-resource)
Creator’s reference Creator’s information Creator’s reference

Integrating Data

Raw Data for entities Minimum Data to identify entities Raw Data for entities
Data from Source A Integrated data Data from Source B
Work
crm:P55_has_current_location
crm:P55_has_current_location dc:creator
dc:creator
dc:creator Museum crm:P55_has_current_location

Creator


Integration of Person Data
• Matching of Creators
– Base: List of Artists from Thesaurus of Japanese Art
– Target: Creators of collection in museums + Dbpedia
– Method: String match of names
– Results: Links from artist nodes to work nodes are added
LODAC data Links

Link to Work

DBpedia

Basic Information
for Creators


Integrating Data
Amount Integration
Integrate Item Source of Data Data

A.Japanese Art Thesaurus 648
Facilities 77
B.Cultural Heritage Online 915

A.Japanese Art Thesaurus (Art work) 3,800
Title of important
74
cultural properties
B.DB for National Treasure (Art work) 10,115

A.Japanese Art Thesaurus (Creator) 1,332
Creator information
and Work Title
15,020
B.All of art work (Work title string) 61,861

A.Japanese Art Thesaurus (Creator) 1,332
Creator name 615
B.All of art work title(using creator name) 61,861

19

Publishing data as RDF
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:lodac="http://lod.a
c/ns/lodac#" xmlns:dc="http://purl.org/dc/terms/"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:skos="http://www.w3.org
/2004/02/skos/core#"> ID-resource URI
<foaf:Person rdf:about="http://lod.ac/id/359"> (Own address)
<lodac:creates rdf:resource="http://lod.ac/id/20029"/> http://lod.ac/id/359
<lodac:creates rdf:resource="http://lod.ac/id/20128"/> Links to her/his work
<lodac:creates rdf:resource="http://lod.ac/id/20755"/> URI
External link <lodac:creates rdf:resource="http://lod.ac/id/24768"/>
DBpedia Japanese <lodac:creates rdf:resource="http://lod.ac/id/26732"/>
……

<dc:references rdf:resource="http://ja.dbpedia.org/resource/下村観山"/>
<dc:references rdf:resource="http://lod.ac/ref/359"/>
<rdfs:label xml:lang="ja">下村観山</rdfs:label>
<skos:prefLabel xml:lang="ja">下村観山</skos:prefLabel>
<foaf:name xml:lang="ja">下村観山</foaf:name>
Ref-resource URI
</foaf:Person>
http://lod.ac/ref/359
20

LODAC Applications
• Photo BURARI Pro
• Yokohama Art Spot
• Go2Museum
• http://lod.ac/apps


Photo BURARI Pro
(C)ATR-Promotions,Inc

Photo App with SPARQL
23

Photo BURARI Pro
(C)ATR-Promotions,Inc

• SPARQL Endpoints
– DBpedia
– Linked Geo Data
– LODAC
• Other data source
– Sinsai.info
• Using JSON Result
– JSON Framework for
Objective C


An example in Objective C
NSString* sparql = @” PREFIX dct: <http://purl.org/dc/terms/ > PREFIX omgeo:
<http://www.ontotext.com/owlim/geo#> PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#> PREFIX
rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT distinct ?link ?title ?lat ?long WHERE{ ?link
dct:references ?ref. ?ref rdfs:label ?title. ?ref geo:lat ?lat. ?ref geo:long ?long. ?ref omgeo:within(NW_lat
NW_long SE_lat SE_long). } LIMIT 30” ;
NSString* query =
(NSString*)CFURLCreateStringByAddingPercentEscapes(kDFAllocatorDefault,
(CFStringRef)sparql, NULL, CFSTR(“;,/?:@=+$#”), kCFStringEncodingUTF8) ;

NSURL *url = [NSURL URLWithString: query ];
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
[req setValue:@”application/sparql-results+json” forHTTPHeaderField:@”Accept”];

NSURLResponse *resp;
NSError *err;
NSData *data = [NSURLConnection sendSynchronousRequest:req returningResponse:&resp error:&err];
NSString* result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];


Yokohama Art Spot
LODAC Museum × Yokohama Art LOD × PinQA

– Application using
museum and local data
– Data related to art in
Yokohama
• Collections
• Events
• Q&A

http://lod.ac/apps/yas/

System Architecture
‣ Python + SPARQLWrapper
‣ Geolocation

Yokohama Art Spot

SPARQL

Yokohama JSON
PinQA LODAC
Art LOD Museum

Question Event Work

User Answer Artist Institution Artist Institution


PREFIX ical: <http://www.w3.org/2002/12/caaltzd#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-sl/icchema#>
PREFIX event: <http://lod.ac/ns/event#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX dc: <http://purl.org/dc/terms/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX lodacid: <http://lod.ac/id/>
PREFIX omgeo: <http://www.ontotext.com/owlim/geo#>
PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
PREFIX vcard: <http://www.w3.org/2006/vcard/ns#>

SELECT distinct ?event ?lat ?long ?title ?location_name ?location ?fee ?dtstart ?dtend
WHERE {
?event a event:Event ; rdfs:label ?title ; event:fee ?fee; ical:location ?location ;
ical:dtstart ?dtstart ; ical:dtend ?dtend .
?location rdfs:label ?location_name ; dc:references ?locRef.
?locRef omgeo:within(%(NE_lat)s %(NE_long)s %(SW_lat)s %(SW_long)s);
vcard:postal-code ?postalcode; geo:lat ?lat; geo:long ?long.
FILTER ((?dtstart > "%(dtstart)s"^^xsd:dateTime && ?dtstart < "%(dtend)s"^^xsd:dateTime) ||
(?dtend > "%(dtstart)s"^^xsd:dateTime && ?dtend < "%(dtend)s"^^xsd:dateTime) ||
(?dtstart < "%(dtstart)s"^^xsd:dateTime && ?dtend > "%(dtend)s"^^xsd:dateTime))
}
ORDER BY (omgeo:distance(?lat, ?long, %(C_lat)s, %(C_long)s))


PREFIX ical: <http://www.w3.org/2002/12/cal/icaltzd#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX event: <http://lod.ac/ns/event#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc11: <http://purl.org/dc/elements/1.1/>

SELECT *
WHERE {
?link a event:Event ;
rdfs:label ?title ;
event:fee ?fee;
ical:categories ?cat;
ical:location %(museum_id)s ;
ical:dtstart ?dtstart ;
ical:dtend ?dtend .
?cat dc11:title ?category.
OPTIONAL{
?link event:Credit ?crd .
?crd dc11:description ?credit .
}
}


PREFIX dc11: <http://purl.org/dc/elements/1.1/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX lodac: <http://lod.ac/ns/lodac#>

SELECT ?link ?title ?creator ?created ?genre ?material ?size
WHERE {
%(museum_id)s lodac:isProviderOf ?link
.
?link rdfs:label ?title;
dc:references ?workRef
.
?workRef lodac:genre %(genre)s;
dc11:creator ?creator;
dc:medium ?material;
dc:extent ?size
.
OPTIONAL{
?workRef dc:created ?created;
}
}
LIMIT 100


Go2Museum

http://160.193.95.58/~ueda/go2museum/

iPhone Android


Museum data from various web sites

NDL CiNii
Search

Search
Search
LODAC LODAC
Google Museum Location Yahoo!
Web/Map/Route Location

Link Link

Link


Twitter: @go2museum
• “Today’s museum”
• Recommendation based on lat&long of tweets


Summary
• A life cycle of data is described
– Scraping, standardizing, integrating, and
publishing
• Important issues
– Recognizing data
– Designing schema
• Good for data
• Good for RDF Store and SPARQL
– Developing applications
• More people can be involved
• Next cycle of data

• Please submit papers
• Meet at Nara

LOD Examplar - LOD Museum -

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