UKSG webinar: Quo vadis? Getting there with linked data with Gordon Dunsire
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The document provides an introduction to linked data, explaining its structure through concepts like triples, chains, and clusters. It discusses the Resource Description Framework (RDF), including how data is represented as machine-readable metadata, and explores the significance of unique identifiers such as Uniform Resource Identifiers (URIs). The webinar also touches on the implications of the semantic web, multilingual linked data, and the complexity of interconnected relationships in cultural heritage data.
![RDF graphs
subject
URI
object
URI
property URI
subject
URI
"object literal"
property URI
ex:M1 rdam:P30001 rdact:1049
ex:M1 rdam:P30088 "[United States?]"Triple 1
Triple 2
… Triple 70 (average number for describing a resource)](https://image.slidesharecdn.com/quovadis-160707092209/85/UKSG-webinar-Quo-vadis-Getting-there-with-linked-data-with-Gordon-Dunsire-7-320.jpg)
![Expression:1
"2004"
rdam:P30135
rdact:1049
rdamt:1007
Work:1
RDA Manifestation linked data graph
Manifestation:1
rdam:P30139
"volume"@en
"unmediated"@en
"[United States?]"
"Margaret Brouwer"
"Concerto for violin and chamber music"
"Brouwer New Music Publishing"
"42 cm"
rdami:1001 "single unit"@en](https://image.slidesharecdn.com/quovadis-160707092209/85/UKSG-webinar-Quo-vadis-Getting-there-with-linked-data-with-Gordon-Dunsire-11-320.jpg)
UKSG webinar: Quo vadis? Getting there with linked data with Gordon Dunsire
- 1. Quo vadis? Getting there with linked data Gordon Dunsire UKSG webinar, 5 July 2016
- 2. Overview A basic introduction to data structures: triples, chains, and clusters What is a linked data record? Global, multilingual linked data Linking data from multiple sources The Semantic Web: a paradigm shift?
- 3. Semantic Web (of linked data) “machine-readable metadata” Faster! 24/7/365! Global! Metadata expressed as “atomic” statements A simple, single, syntactically irreducible statement The title of this book is “Treasure island” In a standard machine-processable format Resource Description Framework (RDF)
- 4. Resource Description Framework Metadata statement constructed in 3 parts “Triple” The title of this book is “Treasure island” Subject of the statement = Subject: This book Nature of the statement = Predicate: has title Value of the statement = Object: “Treasure island” This book – has title – “Treasure island” subject – predicate - object
- 5. Identifiers Need unambiguous way of identifying each part of the triple for efficient machine- processing Human labels (“This book”, “has title”) no good Same thing, different labels; different things, same label Exploit the utility of the URL Machine-readable, regular syntax, unambiguous Uniform Resource Identifier (URI)
- 6. RDF rules Human-readable data are the values of triple statements stored as text "Treasure Island" Character string = "literal" A triple object may be a literal value Everything else is a URI A triple object may be a URI A triple subject must be a URI A triple predicate (property) must be a URI
- 7. RDF graphs subject URI object URI property URI subject URI "object literal" property URI ex:M1 rdam:P30001 rdact:1049 ex:M1 rdam:P30088 "[United States?]"Triple 1 Triple 2 … Triple 70 (average number for describing a resource)
- 8. Merged nodes: Clusters and chains object2 property:y subject1 "a literal" property:x subject3 p:aa thing4 p:ab thing5 object3 "another literal" p:z p:a "any literal"
- 9. Complexity of relationships: Moby Dick Ronald J. Murray: From Moby Dick to mash-ups http://www.slideshare.net/RonMurray/from-mobydick-to-mashups Printed editions “OrsonWhales” mash-up (YouTube) Diagram using FRBR entities and relationships
- 10. title “Ode to himself” Ben Jonson Place X Parchment This ms author “Jonson, Ben” “abcxyz” birthplace normalised name coordinates material “Requires ...” location treatment Manuscript example: RDF graph
- 11. Expression:1 "2004" rdam:P30135 rdact:1049 rdamt:1007 Work:1 RDA Manifestation linked data graph Manifestation:1 rdam:P30139 "volume"@en "unmediated"@en "[United States?]" "Margaret Brouwer" "Concerto for violin and chamber music" "Brouwer New Music Publishing" "42 cm" rdami:1001 "single unit"@en
- 12. RDA Registry for linked data in Open Metadata Registry
- 13. "sin mediación"@es rdamt:1007 Multilingual linked data "unmediated"@en "ohne Hilfsmittel zu benutzen"@de "sans médiation"@fr "无中介"@zh hasLabel
- 14. RIMMF linked data display in English
- 15. Same RIMMF linked data in French
- 16. French cataloguer English agencyGerman content Polylingual data (RIMMF-ball)
- 17. Agent:1 "Brouwer, Margaret, 1940-" "Margaret Brouwer" "Brouwer, Margaret" "1940" rdaa:P50094 rdaa:P50103 rdaa:P50117 rdaa:P50121 RDA Agent linked data cluster dbPedia: Margaret_Brouwer viaf: Margaret_Brouwermatch match
- 18. Identifier management: Match or no match?
- 19. m21: M338__b rdam: P30001 rdam: P30002 dct: format dc: format rdau: P60050 isbd: P1003 schema: encoding Does BIBFRAME fit here? Semantic map of manifestation carrier/media type element Broad/ coarse Narrow/ fine
- 20. Linked open data Semantic Web Semantic data: properties of properties (triples about properties) Provenance data: properties of triples (triples about triples) Anyone can say Anything about Any thing Open World Assumption Absence of data is not data of absence "Record" is never complete
- 21. Paradigm shift? The wisdom of the crowd (Ask the audience) The power of the cloud (Linked data everywhere) No absolute "record" (just data) No test for truth (just inconsistency) Library and cultural heritage data of highest quality
- 22. Thank you rscchair@rdatoolkit.org Open Metadata Registry (IFLA, RDA) http://metadataregistry.org/ RDA Registry http://www.rdaregistry.info/ RIMMF and r-balls (RDA linked data examples) http://rballs.info/
Editor's Notes
- #10: RDA data is designed to reflect the complexity of relationships found in library and cultural heritage resources. This is an example of a paper exercise to draw the relationships between the various printed editions of Herman Melville’s novel “Moby Dick”. The complex sub-graph at the bottom represents a multimedia mash-up of Moby Dick with Orson Welles (who acted in the film of Moby Dick). This diagram can be readily extended. We could add the film starring Gregory Peck as Captain Ahab, and other film and tv adaptations, in multiple formats and editions. And the various recordings of the instrumental “Moby Dick” (for solo drummer!) by Led Zeppelin, and all the other recordings by the group, in multiple formats and editions. And so on.
- #11: RDF triples can be linked by chaining the object (secondary focus) of one triple to the subject (primary focus) of another triple by matching URIs. Triples can also be linked in clusters sharing the same primary focus. Human-readable strings, enclosed in boxes, cannot be linked because they are not URIs. The literal objects of some triples therefore terminate chains of linked triples. This is a small RDF graph about: a manuscript, Ben Jonson, parchment, Place X, depending on your point of view (or primary focus). It is part of what has been called the “one giant global graph” that potentially links all resources, and data about them, together. This graph has no centre, edge, up, or down; it is all about what is in focus (the “subject” of a triple).