An Introduction to
Linked Open Data for Museums
David Henry
Jarred Moore
MW2014
Presented by
An Introduction to Linked Open Data for
Museums
Limitations of Keyword Searching
Polysemy: One word with multiple meanings. E.g.
man
crane
bank
Synonymy: Multiple words w...
What is Linked Open Data?
On the web, open license
Machine-readable data
Non-proprietary format
RDF Format
Linked RDF
Copyright and Licensing
If Your content files are still under copyright and your institution is the
copyright owner, encou...
What is RDF?
• “Resource Description Framework (RDF) is a standard model for data
interchange on the Web. RDF has features...
What are Triples?
• Triples are statements of fact (or assertions) composed of a
subject, predicate, and object. For examp...
What are Questions Answered by RDF?
Fact-Based
Interpretive
Theoretical
Subjective
Analytical
Fact Based Questions ask Who, What,
When Where (Not so much Why)
Fact-Based
Questions
Who directed “Citizen Kane’?
What’s ...
Fact Based Question:
Are there any daguerreotypes of the
Mississippian mounds in St. Louis, Missouri?
Title: Group of peop...
Triples to Complex
Graphs
Thomas M. Easterly
1869Subject
“Mississippian Culture”
hasSubject
hasLabel
hasType
Daguerreotype
“Thomas M.
Easterly” Name: Thomas M. Easterly
Birth Date: October 3, 1809
Death Date: March 12, 1882
Places of Residence:
...
Exercise 1.
Time: 10-15 minutes Activity:
• Break into groups of 2-3.
• Write out one or more research questions.
• For ea...
What’s Wrong with the Good Ole Web?
What is a Uniform Resource Identifier?
Uniform
Resource
Locator
-----
Purpose:
To locate a
web resource
(document)
Uniform...
Principles of Linked Data
• Use URIs to denote things.
• Use HTTP URIs so that these things can be referred to and
looked ...
Triples to Complex
Graphs
Resource:9952
Thomas M. Easterly
1839
ns1:Subject_91011
“Mississippian Culture”
nso:hasSubject
n...
Triples to Complex
Graphs
http://collections.mohistory.org/resource/9952
ns1:Person_5678
Thomas M. Easterly
1839
ns1:Subje...
What two words are most commonly
found in a browser window?
Web links have a half life of about ten years.
In other words,...
Document
DocumentDocument
DocumentDocument
Link rot is a serious problem on the document-based web.
Person
PersonObject
PlaceObject
createdBy
createdBy
knows
livesAt
Link rot is even more serious on the web of data.
Rules for persistent URI’sCoolURI’s
• No date Context
• No ownership context
• No technology context
• Re-use existing ide...
Example URI:
http://education.data.gov.uk/ministryofeducation/id/school/123456
http://education.data.gov.uk/doc/school/v01...
Writing RDF
RDFXML
Turtle
NTriples
<rdf:RDF xmlns:ns0=“http://mydomain.org/people/”
xmlns:n1=http://otherdonain.org/>
<des...
Triples to Complex
Graphs
http://collections.mohistory.org/resource/9952
Resource:92142
Thomas M. Easterly
1839
ns1:Subjec...
Graph to RDF as Turtle
@prefix resource: <http://collections.mohistory.org/resource/> .
@prefix ns0: <http://collections.m...
Exercise 2.
Time: 15 minutes Activity:
• Break into groups of 2-3.
• Using the graph defined in Exercise 1, define a set o...
What is Linked Open Data?
On the web, open license
Machine-readable data
Non-proprietary format
RDF Format
Linked RDF
Principles of Linked Data
• Use URIs to denote things.
• Use HTTP URIs so that these things can be referred to and looked ...
Core Vocabularies
• RDF & RDFS
• Useful terms: rdf:type, rdfs:label
• SKOS (Simple Knowledge Organization Schema)
• Useful...
Ontology
Thesaurus
Controlled
Vocabulary
Vocabulary Types
Simple list of terms.
e.g. DCMI Types list
Hierarchical list of ...
Example using CRM
Core
E52 Time-Span
1898
E53 Place
France
(nation)
E21 Person
Rodin Auguste
E52 Time-Span
1840
E67 Birth
...
Implementing Linked Open
Data
Link existing data
• Low barrier to entry
• Controlled lists and
thesauri
• Not very descrip...
What is RDF?
• “Resource Description Framework (RDF) is a standard model for data
interchange on the Web. RDF has features...
Triples to Complex
Graphs
http://collections.mohistory.org/resource/9952
Resource:92142
Thomas M. Easterly
1839
ns1:Subjec...
Finding Links
• Linked Open Vocabularies is a good starting point
• Other well-used sources include:
• DBPedia - for a wid...
A Note of Caution
When re-using existing URIs, be sure to use the URI that represents
the entity (thing/concept/person) an...
A Note of Caution
When re-using existing URIs, be sure to use the URI that represents
the entity (thing/concept/person) an...
Finding Links
• Matching predicates.
• hasType => rdfs:type, dcterms:type, crm:E55_Type
• createdBy => dc:creator, crm:P94...
Triples to Complex
Graphs
http://collections.mohistory.org/resource/9952
Resource:92142
Thomas M. Easterly
1839
ns1:Subjec...
@prefix resource: <http://collections.mohistory.org/resource/> .
@prefix ns0: <http://collections.mohistory.org/vocab/rela...
Exercise 3.
Time: 15-20 minutes
Activity:
• Break into groups of 2-3.
• Using the triples you defined in Exercise 3, find ...
How Tos
• Embed schema.org data in a web page
• Publish static RDF files
• Manage local vocabularies and align them with e...
Embedding
schema.org
<div itemscope itemtype="http://schema.org/CreativeWork">
<img src="http://collections.mohistory.org/...
Publish static RDF files
• RDF files can be hand-written (what fun!) or rendered using templates
• Paths to RDF files can ...
Manage local vocabularies and align
them with existing vocabularies
Tools include:
PoolParty
Tematres
Karma
Contributing to a collection aggregator –
e.g. Europeana or DPLA
Service
Hub
• Dataset A
• Dataset B
• Dataset C
Service
H...
Publish existing database records as
RDF
Managing RDF data in a triple (or quad)
store
• Quad = triple + context
• Most stores feature a SPARQL interface to query ...
Questions?
dhenry@mohistory.org
jmoore@mohistory.org
MW2014 Workshop - Intro to Linked Open Data
MW2014 Workshop - Intro to Linked Open Data
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  • Add Thomas,mhm, host hotel, depository
  • 3 min europiana and ted talk
  • Below are some open data options from the Creative CommonsThese are listed from the least restrictive at the top of this slide to the most restrictive at the bottom of this slide. CCO – is when a copyright owner waives their right and dedicates it to the public domainCC-BY is when only requirement is attribution to the owner when reusingCC-BY-SA adds the additional criteria for others to share alike under the same termsCC-BY-NC - further restricts re-use to non-commercial uses only. I put this in red because some open data purists believe that a non-commercial restriction does not qualify for open content status.
  • Time: 10-15 minutes Activity: Break into groups of 2-3. Write out one or more research questions.For each question, draw a entity-relationship graph that could provide an answer to the question
  • RDF can be written in various formats including:RDFXMLN-TriplesTurtleJSON-LD
  • See http://data.nytimes.com/77498966567276420453 for an example of crosslinking “Joan Baez”-- linkage uses the owl:sameAs predicate to link the URI for Joan Baez at the New York Times with the URI at DBPedia.
  • Ad foaf
  • DCMI Types: http://dublincore.org/documents/2000/07/11/dcmi-type-vocabulary/Library of Congress Subject Headings: http://id.loc.gov/authorities/subjects/sh85086237.htmlCIDOC CRM: http://www.cidoc-crm.org/docs/cidoc_crm_version_5.1.2.pdf
  • Is there a URI for the type &quot;Daguerreotype&quot;?1) Try Linked open vocabularies. result: Nothing for &quot;Daguerreotype&quot; ref: http://lov.okfn.org/dataset/lov/search/#s=Daguerreotype result2: Many hits for &quot;photograph&quot; ref: http://lov.okfn.org/dataset/lov/search/#s=photograph -- could use http://schema.org/photograph as a broad match2) Try the LOC Linked Data Service. result: Subject result for &quot;Daguerreotype&quot; ref: http://id.loc.gov/search/?q=Daguerreotype&amp;q= result2: after filtering by the TGM, found http://id.loc.gov/vocabulary/graphicMaterials/tgm002852.html -- good result: well used vocabulary; fits within a hierarchy3) Try DBPedia. result: found a dbpedia resource ref: http://lookup.dbpedia.org/api/search.asmx/PrefixSearch?QueryClass=&amp;MaxHits=5&amp;QueryString=daguerreotype
  • Is there a URI for the type &quot;Daguerreotype&quot;?1) Try Linked open vocabularies. result: Nothing for &quot;Daguerreotype&quot; ref: http://lov.okfn.org/dataset/lov/search/#s=Daguerreotype result2: Many hits for &quot;photograph&quot; ref: http://lov.okfn.org/dataset/lov/search/#s=photograph -- could use http://schema.org/photograph as a broad match2) Try the LOC Linked Data Service. result: Subject result for &quot;Daguerreotype&quot; ref: http://id.loc.gov/search/?q=Daguerreotype&amp;q= result2: after filtering by the TGM, found http://id.loc.gov/vocabulary/graphicMaterials/tgm002852.html -- good result: well used vocabulary; fits within a hierarchy3) Try DBPedia. result: found a dbpedia resource ref: http://lookup.dbpedia.org/api/search.asmx/PrefixSearch?QueryClass=&amp;MaxHits=5&amp;QueryString=daguerreotype
  • Embed schema.org data in a web pagePublish static RDF filesManage local vocabularies and align them with existing vocabulariesContributing to a collection aggregator – e.g. Europeana or DPLAPublish existing database records as RDFManaging RDF data in a triple (or quad) store
  • Embed schema.org data in a web pagePublish static RDF filesManage local vocabularies and align them with existing vocabulariesContributing to a collection aggregator – e.g. Europeana or DPLAPublish existing database records as RDFManaging RDF data in a triple (or quad) store
  • Embed schema.org data in a web pagePublish static RDF filesManage local vocabularies and align them with existing vocabulariesContributing to a collection aggregator – e.g. Europeana or DPLAPublish existing database records as RDFManaging RDF data in a triple (or quad) store
  • Embed schema.org data in a web pagePublish static RDF filesManage local vocabularies and align them with existing vocabulariesContributing to a collection aggregator – e.g. Europeana or DPLAPublish existing database records as RDFManaging RDF data in a triple (or quad) store
  • MW2014 Workshop - Intro to Linked Open Data

    1. 1. An Introduction to Linked Open Data for Museums David Henry Jarred Moore MW2014 Presented by
    2. 2. An Introduction to Linked Open Data for Museums
    3. 3. Limitations of Keyword Searching Polysemy: One word with multiple meanings. E.g. man crane bank Synonymy: Multiple words with the same meaning. buy OR purchase create OR make eliminate OR remove OR abolish Signal to noise ratio e.g. Try searching for the term “Mississippi”
    4. 4. What is Linked Open Data? On the web, open license Machine-readable data Non-proprietary format RDF Format Linked RDF
    5. 5. Copyright and Licensing If Your content files are still under copyright and your institution is the copyright owner, encourage your institution to license the content as openly as possible CCO CC-BY CC-BY-SA CC-BY-NC
    6. 6. What is RDF? • “Resource Description Framework (RDF) is a standard model for data interchange on the Web. RDF has features that facilitate data merging even if the underlying schemas differ, and it specifically supports the evolution of schemas over time without requiring all the data consumers to be changed. “ (from W3C) • “…making Statements about resources (in particular web resources) in the form of subject-predicate-object expressions.” (Wikipedia)
    7. 7. What are Triples? • Triples are statements of fact (or assertions) composed of a subject, predicate, and object. For example: “David Henry” Subject “Lives in” Predicate “St. Louis” Object
    8. 8. What are Questions Answered by RDF? Fact-Based Interpretive Theoretical Subjective Analytical
    9. 9. Fact Based Questions ask Who, What, When Where (Not so much Why) Fact-Based Questions Who directed “Citizen Kane’? What’s a daguerreotype? Where did Van Gogh paint ‘Starry Night’?
    10. 10. Fact Based Question: Are there any daguerreotypes of the Mississippian mounds in St. Louis, Missouri? Title: Group of people standing on a partially destroyed Big Mound. Description: Group of people standing on a partially destroyed Big Mound. Place: St. Louis, Missouri Dates: 1869 Type(s): photo, Daguerreotype Maker/Creator: Thomas M. Easterly Subjects: Mississippian Culture, mounds Identifier: PHO:17665 Permalink: http://collections.mohistory.org/resource/9952
    11. 11. Triples to Complex Graphs Thomas M. Easterly 1869Subject “Mississippian Culture” hasSubject hasLabel hasType Daguerreotype
    12. 12. “Thomas M. Easterly” Name: Thomas M. Easterly Birth Date: October 3, 1809 Death Date: March 12, 1882 Places of Residence: Guilford, Vermont Liberty, Missouri St. Louis, Missouri Bio: Thomas M. Easterly was one of the leading American Daguerreotypists …. During the 1860s, improvements in photographic development caused daguerreotypes to become out of fashion. Easterly refused to acknowledge these changes believing the highly detailed daguerreotypes were far superior in terms of beauty or permanence urging the public to "save your old daguerreotypes for you will never see their like again".
    13. 13. Exercise 1. Time: 10-15 minutes Activity: • Break into groups of 2-3. • Write out one or more research questions. • For each question, draw a entity-relationship graph that could provide an answer to the question
    14. 14. What’s Wrong with the Good Ole Web?
    15. 15. What is a Uniform Resource Identifier? Uniform Resource Locator ----- Purpose: To locate a web resource (document) Uniform Resource Name ----- Purpose: To identify any resourceIn Linked Open Data, URIs act as both URLs and URNs UR I
    16. 16. Principles of Linked Data • Use URIs to denote things. • Use HTTP URIs so that these things can be referred to and looked up ("dereferenced") by people and user agents. • Provide useful information about the thing when its URI is dereferenced, leveraging standards such as RDF, SPARQL. • Include links to other related things (using their URIs) when publishing data on the Web. To make this happen subjects and predicates MUST be defined by URIs. Objects may be URIs or literals.
    17. 17. Triples to Complex Graphs Resource:9952 Thomas M. Easterly 1839 ns1:Subject_91011 “Mississippian Culture” nso:hasSubject nso:hasLabel nso:hasType “Daguerreotype” ns1:type_80345 Resource:92142
    18. 18. Triples to Complex Graphs http://collections.mohistory.org/resource/9952 ns1:Person_5678 Thomas M. Easterly 1839 ns1:Subject_91011 “Mississippian Culture” nso:hasSubject nso:hasLabel nso:hasType “Daguerreotype” ns1:type_80345
    19. 19. What two words are most commonly found in a browser window? Web links have a half life of about ten years. In other words, 50% of links that are 10 years old are broken.
    20. 20. Document DocumentDocument DocumentDocument Link rot is a serious problem on the document-based web.
    21. 21. Person PersonObject PlaceObject createdBy createdBy knows livesAt Link rot is even more serious on the web of data.
    22. 22. Rules for persistent URI’sCoolURI’s • No date Context • No ownership context • No technology context • Re-use existing identifiers • Link multiple representations • Implement 303 redirects for real world objects NotCoolURI’s • Avoid stating ownership • Avoid version numbers • Avoid query strings • Avoid file extensions
    23. 23. Example URI: http://education.data.gov.uk/ministryofeducation/id/school/123456 http://education.data.gov.uk/doc/school/v01/123456 states ownership version number good Mostly good http://www.example.com/id/alice_brown http://data.nytimes.com/88843902954064461461
    24. 24. Writing RDF RDFXML Turtle NTriples <rdf:RDF xmlns:ns0=“http://mydomain.org/people/” xmlns:n1=http://otherdonain.org/> <description about=“ns0:David_Henry”> <ns1:livesIn>St. Louis, MO</ns1:livesIn> </description> @prefix ns0: <http://mydomain.org/people/> . @prefix ns1: <http://otherdomain.org/> . ns0:David_Henry ns1:livesIn “St. Louis, MO” . <http://mydomain.org/people/David_Henry> <http://otherdomain.org/livesIn> “St. Louis, MO” . “David Henry” “Lives In” “St. Louis”
    25. 25. Triples to Complex Graphs http://collections.mohistory.org/resource/9952 Resource:92142 Thomas M. Easterly 1839 ns1:Subject_91011 “Mississippian Culture” nso:hasSubject nso:hasLabel nso:hasType “Daguerreotype” ns1:type_80345
    26. 26. Graph to RDF as Turtle @prefix resource: <http://collections.mohistory.org/resource/> . @prefix ns0: <http://collections.mohistory.org/vocab/relators/> . @prefix xsd: <http://www.w3.org/2001/XMLSchema> . resource:9952 ns0:dateCreated "1869-01-01"^^xsd:date . resource:9952 ns0:hasType <http://collections.mohistory.org/vocab/daguerreotype> . resource:9952 ns0:createdBy resource:92142 . resource:92142 ns0:hasLabel "Thomas M. Easterly" . resource:9952 ns0:hasSubject resource:5215 . resource:5215 ns0:hasLabel "Mississippian Culture" .
    27. 27. Exercise 2. Time: 15 minutes Activity: • Break into groups of 2-3. • Using the graph defined in Exercise 1, define a set of triples from the graph (Use your own URIs) • Use the RDF validator at http://www.rdfabout.com/demo/validator/
    28. 28. What is Linked Open Data? On the web, open license Machine-readable data Non-proprietary format RDF Format Linked RDF
    29. 29. Principles of Linked Data • Use URIs to denote things. • Use HTTP URIs so that these things can be referred to and looked up ("dereferenced") by people and user agents. • Provide useful information about the thing when its URI is dereferenced, leveraging standards such as RDF, SPARQL. • Include links to other related things (using their URIs) when publishing data on the Web.
    30. 30. Core Vocabularies • RDF & RDFS • Useful terms: rdf:type, rdfs:label • SKOS (Simple Knowledge Organization Schema) • Useful terms: skos:broader, skos:narrower • OWL (Web Ontology Language) • Useful terms: owl:sameAs, owl:differentFrom • Dublin Core • Useful terms: dc:creator, dc:date, dc: subject • Foaf • Useful terms: foaf:name, foaf:knows, foaf:image
    31. 31. Ontology Thesaurus Controlled Vocabulary Vocabulary Types Simple list of terms. e.g. DCMI Types list Hierarchical list of terms e.g. Library of Congress Subjects Hierarchical list of terms with relationship constraints e.g. CIDOC CRM
    32. 32. Example using CRM Core E52 Time-Span 1898 E53 Place France (nation) E21 Person Rodin Auguste E52 Time-Span 1840 E67 Birth Rodin’s birth E52 Time-Span 1917 P4 has time-span E69 Death Rodin’s death E12 Production Rodin making “Monument to Balzac” in 1898 E21 Person Honoré de Balzac E55 Type sculptors E84 Information Carrier The “Monument to Balzac” (plaster) E55 Type plaster E52 Time-Span 1925 E55 Type bronze E40 Legal Body Rudier (Vve Alexis) et Fils E12 Production Bronze casting“Monument to Balzac” in 1925 E55 Type companies E84 Information Carrier The “Monument to Balzac”(S1296) P108B was produced by P62 depicts P16B was used for P134 continued P2 has type P120B occurs after P4 has time-span P2 has type P100B died in P98B was born P4 has time -span P2 has type P14 carried out by P14 carried out by P62 depicts P108B was produced by P2 has type P7 took place at P4 has time-span
    33. 33. Implementing Linked Open Data Link existing data • Low barrier to entry • Controlled lists and thesauri • Not very descriptive Manage data to fit an ontology • High barrier to entry • Ontologies • Very descriptive RDF facilitates the “evolution of schemas over time”
    34. 34. What is RDF? • “Resource Description Framework (RDF) is a standard model for data interchange on the Web. RDF has features that facilitate data merging even if the underlying schemas differ, and it specifically supports the evolution of schemas over time without requiring all the data consumers to be changed. “ (from W3C) • “…making Statements about resources (in particular web resources) in the form of subject-predicate-object expressions.” (Wikipedia)
    35. 35. Triples to Complex Graphs http://collections.mohistory.org/resource/9952 Resource:92142 Thomas M. Easterly 1839 ns1:Subject_91011 “Mississippian Culture” nso:hasSubject nso:hasLabel nso:hasType “Daguerreotype” ns1:type_80345
    36. 36. Finding Links • Linked Open Vocabularies is a good starting point • Other well-used sources include: • DBPedia - for a wide-range of types (people, places, subjects, concepts) • Id.loc.gov – for name authorities and subjects • Viaf.org – for name authorities • geonames.org – for geographic locations Problem: There are no universal vocabularies
    37. 37. A Note of Caution When re-using existing URIs, be sure to use the URI that represents the entity (thing/concept/person) and not the web resource. For example: http://id.loc.gov/authorities/subjects/sh85126887.html Is NOT the same as: http://id.loc.gov/authorities/subjects/sh85126887
    38. 38. A Note of Caution When re-using existing URIs, be sure to use the URI that represents the entity (thing/concept/person) and not the web resource.
    39. 39. Finding Links • Matching predicates. • hasType => rdfs:type, dcterms:type, crm:E55_Type • createdBy => dc:creator, crm:P94i_was_created_by • dateCreated => dc:created, ? • Matching value vocabularies. • “Daguerreotype” => http://dbpedia.org/resource/Daguerreotype • “Mississippian Culture” => http://id.loc.gov/authorities/subjects/sh85086218 • “Thomas Easterly” => http://viaf.org/viaf/13114715/ Problem: There are no universal vocabularies
    40. 40. Triples to Complex Graphs http://collections.mohistory.org/resource/9952 Resource:92142 Thomas M. Easterly 1839 ns1:Subject_91011 “Mississippian Culture” dc:subject rdfs:label rdf:type “Daguerreotype” ns1:type_80345
    41. 41. @prefix resource: <http://collections.mohistory.org/resource/> . @prefix ns0: <http://collections.mohistory.org/vocab/relators/> . @prefix dc: <http://purl.org/dc/terms/> . # dc:creator; dc:created; dc:subject @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . # rdf:type @prefix owl: <http://www.w3.org/2002/07/owl#> . # sameAs; differentFrom @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . # date; integer resource:9952 ns0:dateCreated "1869"^^xsd:date . resource:9952 dc:date "1869-01-01"^^xsd:date . resource:9952 ns0:hasType <http://collections.mohistory.org/vocab/daguerreotype> . resource:9952 rdf:type <http://dbpedia.org/resource/Daguerreotype> . resource:9952 ns0:createdBy resource:92142 . resource:9952 dc:creator <http://viaf.org/viaf/13114715/> . resource:92142 ns0:hasLabel "Thomas M. Easterly" . resource:9952 ns0:hasSubject resource:5215 . resource:9952 dc:subject <http://id.loc.gov/authorities/subjects/sh85086218> . #resource:5215 ns0:hasLabel "Mississippian Culture" . resource:92142 owl:sameAs <http://viaf.org/viaf/13114715/> . Graph to RDF as Turtle
    42. 42. Exercise 3. Time: 15-20 minutes Activity: • Break into groups of 2-3. • Using the triples you defined in Exercise 3, find existing URIs to link with your local URIs. • Be prepared to explain why you chose the URIs your chose.
    43. 43. How Tos • Embed schema.org data in a web page • Publish static RDF files • Manage local vocabularies and align them with existing vocabularies • Contributing to a collection aggregator – e.g. Europeana or DPLA • Publish existing database records as RDF • Managing RDF data in a triple (or quad) store
    44. 44. Embedding schema.org <div itemscope itemtype="http://schema.org/CreativeWork"> <img src="http://collections.mohistory.org/resource/16679.jpg" class="item_image" width="300" itemprop="image" /> <div id="record_detail"> <p><b>Title:</b> <span itemprop="name“>Lord Fitzwilliam and manservant, hunting on the Hunt Farm on Gravois Road.</span></p> <p><b>Description:</b> <span itemprop="description"></span></p> <p><b>Item:</b> <span itemprop="additionalType">Daguerreotype</span></p> <p><b>Dates:</b> <span itemprop="dateCreated">1855 to 1865</span></p> . Copy and paste entire text
    45. 45. Publish static RDF files • RDF files can be hand-written (what fun!) or rendered using templates • Paths to RDF files can be submitted to RDF search engines such as Sindice (http://sindice.com) • Caution: Some content negotiation would be required. • Remember: http://mydomain.org/resource/1234.rdf is NOT the same as http://mydomain.org/resource/1234
    46. 46. Manage local vocabularies and align them with existing vocabularies Tools include: PoolParty Tematres Karma
    47. 47. Contributing to a collection aggregator – e.g. Europeana or DPLA Service Hub • Dataset A • Dataset B • Dataset C Service Hub • Dataset 1 • Dataset 2 • Dataset 3 Content Hub • Dataset X • Dataset Y • Dataset Z
    48. 48. Publish existing database records as RDF
    49. 49. Managing RDF data in a triple (or quad) store • Quad = triple + context • Most stores feature a SPARQL interface to query across all triples (quads) in a repository • Tools: • Sesame – from OpenRDF • Virtuoso • Mulgara
    50. 50. Questions? dhenry@mohistory.org jmoore@mohistory.org
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