Quo vadis?Getting there with linked data

Gordon DunsireUKSG webinar, 5 July 2016

Overview

A basic introduction to data structures: triples, chains, and clusters

What is a linked data record?Global, multilingual linked dataLinking data from multiple sourcesThe Semantic Web: a paradigm shift?

Semantic Web (of linked data)

“machine-readable metadata”Faster! 24/7/365! Global!

Metadata expressed as “atomic” statementsA simple, single, syntactically irreducible

statementThe title of this book is “Treasure island”

In a standard machine-processable formatResource Description Framework (RDF)

Resource Description Framework

Metadata statement constructed in 3 parts“Triple”

The title of this book is “Treasure island”Subject of the statement = Subject: This bookNature of the statement = Predicate: has titleValue of the statement = Object: “Treasure island”

This book – has title – “Treasure island”subject – predicate - object

Identifiers

Need unambiguous way of identifying each part of the triple for efficient machine-processingHuman labels (“This book”, “has title”) no good

Same thing, different labels; different things, same label

Exploit the utility of the URLMachine-readable, regular syntax, unambiguous

Uniform Resource Identifier (URI)

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 valueEverything else is a URI

A triple object may be a URIA triple subject must be a URIA triple predicate (property) must be a URI

RDF graphs

subjectURI

objectURI

property URI

subjectURI "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)

Merged nodes: Clusters and chains

object2property:y

subject1"a literal"

property:x

subject3

p:aathing4

p:abthing5

object3

"another literal"

p:z

p:a

"any literal"

Complexity of relationships: Moby Dick

Ronald J. Murray: From Moby Dick to mash-upshttp://www.slideshare.net/RonMurray/from-mobydick-to-mashups

Printed editions

“OrsonWhales” mash-up (YouTube)

Diagram using FRBR entities and relationships

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

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

RDA Registry for linked data in Open Metadata Registry

"sin mediación"@es

rdamt:1007

Multilingual linked data

"unmediated"@en

"ohne Hilfsmittel zu benutzen"@de

"sans médiation"@fr

"无中介 "@zh

hasLabel

RIMMF linked data display in English

Same RIMMF linked data in French

French cataloguer English agencyGerman content

Polylingual data (RIMMF-ball)

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

Identifier management:Match or no match?

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 typeelement

Broad/coarse

Narrow/fine

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 AssumptionAbsence of data is not

data of absence"Record" is never

complete

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

Thank you

rscchair@rdatoolkit.orgOpen Metadata Registry (IFLA, RDA)

http://metadataregistry.org/RDA Registry

http://www.rdaregistry.info/RIMMF and r-balls (RDA linked data examples)

http://rballs.info/