RDA and Linked Data. Gordon Dunsire

Biblioteca Nacional de España
Biblioteca Nacional de EspañaBiblioteca Nacional de España
RDA and Linked Data
Gordon Dunsire
Presented at Cita BNE - RDA and Linked
Data, 15 April 2016, Madrid, Spain
Overview
Introduction: basic linked data
RDA Registry RDA Reference
Registry add-ons
Unconstrained elements, maps, etc.
RDA: resource description and access
“RDA is a package of data elements,
guidelines, and instructions for creating library
and cultural heritage resource metadata that
are well-formed according to international
models for user-focussed linked data
applications.”
RDA Board, 2015
http://www.rda-rsc.org/node/235
International models
FRBR (IFLA)
FRBR/FRAD/FRSAD → FRBR-LRM (Library
Reference Model)
FRBRoo ← CIDOC-CRM (Conceptual Reference
Model)
Resource Description Framework (RDF)
←Dublin Core Abstract Model (DCMI)
Linked data and RDF
Resource Description Framework (RDF)
Designed for machine-processing of metadata
at global scale (Semantic Web)
24/7/365
Trillions of operations per second
Everything must be dis-ambiguated
Machines are dumb
A simple approach helps!
Require machine-readable identifiers
RDF triple
Metadata expressed as “atomic” statements
A simple, single, irreducible statement
The title of this book is “RDA is fun!”
Constructed in 3 parts
“Triple”
The title of this book is “RDA is fun!”
Subject of the statement = Subject: This book
Nature of the statement = Predicate: has title
Value of the statement = Object: “RDA is fun!”
This book – has title – “RDA is fun!”
Syntax: subject – predicate - object
Machine-readable identifiers
Uniform Resource Identifier (URI)
Can be any unique combination of numbers and
letters
No intrinsic meaning; it is just an identifier
RDF requires the subject and predicate of triple
to be URIs
Object can be a URI, or a literal string (“RDA is fun!”)
URIs can be matched by machine to link triples
together in chains and clusters
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
Linked data vocabularies
Each thing is globally identified by a URI
A thing may be identified by more than one URI
A URI must identify only one thing
Each thing is linked to, and humanly identified
by, a label and/or definition.
A thing may be identified by more than one label
A label may identify more than one thing
Labels are fashionable, and at the mercy of
convention and trend
3 types of linked data vocabulary
Datasets (e.g. datos.bne.es)
Individual things
E.g. specific Person, Item, Place, etc.
Value vocabularies
Concepts, terminologies
E.g. subject headings, thesauri, etc.
Element sets
Types of thing (classes); types of relationship between
things
E.g. Person, place of birth, supervisor, etc.
RDA in RDF
RDA controlled terminologies represented as
RDF value vocabularies
Example: RDA carrier type vocabulary
Entities, attributes, and relationships
represented as RDF element sets
Entities represented in RDF as classes
Attributes and relationships represented in RDF as
properties (“predicates”)
RDA entities
FRBR Work-Expression-Manifestation-Item
Discrete components of a resource; avoids duplication
of data
E.g. Work creator and Expression language are linked
to, not copied in, multiple Manifestation descriptions
E.g. printed book, digitized book, and e-book
FRBR Person, Family, and Corporate Body
Agents related to a resource
FRBR-LRM introduces new entities for Place,
Timespan, and Nomen (name) [expected 2016]
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
RDA Registry: rdaregistry.info
RDA Reference
Elements, attributes, relationships
Values
Other Glossary terms
Translations and partial translations
Formal or canonical URI is “opaque”
- not intended for human readability
Lexical URI is intended for human readability
in different languages
RDF linked data serializations
Except HTML for humans
Web view of RDA/RDF
Open Metadata Registry (http://metadataregistry.org)
Fine granularity audit trail
Machine views of RDA elements
<http://rdaregistry.info/Elements/m/P30001>
reg:hasUnconstrained <http://rdaregistry.info/Elements/u/P60048> ;
reg:lexicalAlias <http://rdaregistry.info/Elements/m/carrierType.en> ;
reg:name "carrierType"@en ;
reg:status <http://metadataregistry.org/uri/RegStatus/1001> ;
rdakit:instructionNumber "3.3" ;
rdakit:toolkitDefinition "A categorization reflecting the format of the storage
medium and housing of a carrier in combination with the type of intermediation
device required to view, play, run, etc., the content of a resource."@en ;
rdakit:toolkitLabel "carrier type"@en ;
a rdf:Property ;
rdfs:domain <http://rdaregistry.info/Elements/c/C10007> ;
rdfs:isDefinedBy <http://rdaregistry.info/Elements/m/> ;
rdfs:label "has carrier type"@en ;
skos:definition "Relates a manifestation to a categorization reflecting the
format of the storage medium and housing of a carrier in combination with the
type of intermediation device required to view, play, run, etc., the content of a
resource."@en .
Multilingual linked data
French
German
Spanish
Chinese
…
Multi-schema linked data
Linking RDA to:
ISBD
MARC21
RDA/ONIX Framework
…
Unconstrained linked data
Remove FRBR
model to
“dumb-down”
semantics to
common level
of granularity
“resources”
and “agents”
Example: Contributor
Relates a resource to an agent
contributing to a resource.
Beyond RDA data: ISBD
ISBDURDAU
ISBDRDA
Work
Expression
Manifestation
Item
Resource
[Linked data cloud, not RDF graph]
Unconstrained
(No entity
Specified)
RDA linked data in action: Cervathon
Hackathon for RDA data
Using RIMMF software
With output format for
linked data (RDA/RDF)
Conclusion
RDA supports fine-grained linked data
compatible with the FRBR model
RDA supports extensions and refinements for
cultural heritage data
RDA supports the multilingual Semantic Web
RDA supports linked data application
developers
RDA is linked data fun!
Thank you!
rscchair@rdatoolkit.org
http://www.rda-rsc.org/
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RDA and Linked Data. Gordon Dunsire

  • 1. RDA and Linked Data Gordon Dunsire Presented at Cita BNE - RDA and Linked Data, 15 April 2016, Madrid, Spain
  • 2. Overview Introduction: basic linked data RDA Registry RDA Reference Registry add-ons Unconstrained elements, maps, etc.
  • 3. RDA: resource description and access “RDA is a package of data elements, guidelines, and instructions for creating library and cultural heritage resource metadata that are well-formed according to international models for user-focussed linked data applications.” RDA Board, 2015 http://www.rda-rsc.org/node/235
  • 4. International models FRBR (IFLA) FRBR/FRAD/FRSAD → FRBR-LRM (Library Reference Model) FRBRoo ← CIDOC-CRM (Conceptual Reference Model) Resource Description Framework (RDF) ←Dublin Core Abstract Model (DCMI)
  • 5. Linked data and RDF Resource Description Framework (RDF) Designed for machine-processing of metadata at global scale (Semantic Web) 24/7/365 Trillions of operations per second Everything must be dis-ambiguated Machines are dumb A simple approach helps! Require machine-readable identifiers
  • 6. RDF triple Metadata expressed as “atomic” statements A simple, single, irreducible statement The title of this book is “RDA is fun!” Constructed in 3 parts “Triple” The title of this book is “RDA is fun!” Subject of the statement = Subject: This book Nature of the statement = Predicate: has title Value of the statement = Object: “RDA is fun!” This book – has title – “RDA is fun!” Syntax: subject – predicate - object
  • 7. Machine-readable identifiers Uniform Resource Identifier (URI) Can be any unique combination of numbers and letters No intrinsic meaning; it is just an identifier RDF requires the subject and predicate of triple to be URIs Object can be a URI, or a literal string (“RDA is fun!”) URIs can be matched by machine to link triples together in chains and clusters
  • 8. 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
  • 9. Linked data vocabularies Each thing is globally identified by a URI A thing may be identified by more than one URI A URI must identify only one thing Each thing is linked to, and humanly identified by, a label and/or definition. A thing may be identified by more than one label A label may identify more than one thing Labels are fashionable, and at the mercy of convention and trend
  • 10. 3 types of linked data vocabulary Datasets (e.g. datos.bne.es) Individual things E.g. specific Person, Item, Place, etc. Value vocabularies Concepts, terminologies E.g. subject headings, thesauri, etc. Element sets Types of thing (classes); types of relationship between things E.g. Person, place of birth, supervisor, etc.
  • 11. RDA in RDF RDA controlled terminologies represented as RDF value vocabularies Example: RDA carrier type vocabulary Entities, attributes, and relationships represented as RDF element sets Entities represented in RDF as classes Attributes and relationships represented in RDF as properties (“predicates”)
  • 12. RDA entities FRBR Work-Expression-Manifestation-Item Discrete components of a resource; avoids duplication of data E.g. Work creator and Expression language are linked to, not copied in, multiple Manifestation descriptions E.g. printed book, digitized book, and e-book FRBR Person, Family, and Corporate Body Agents related to a resource FRBR-LRM introduces new entities for Place, Timespan, and Nomen (name) [expected 2016]
  • 13. 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
  • 14. RDA Registry: rdaregistry.info RDA Reference Elements, attributes, relationships Values Other Glossary terms Translations and partial translations
  • 15. Formal or canonical URI is “opaque” - not intended for human readability Lexical URI is intended for human readability in different languages RDF linked data serializations Except HTML for humans
  • 16. Web view of RDA/RDF Open Metadata Registry (http://metadataregistry.org) Fine granularity audit trail
  • 17. Machine views of RDA elements <http://rdaregistry.info/Elements/m/P30001> reg:hasUnconstrained <http://rdaregistry.info/Elements/u/P60048> ; reg:lexicalAlias <http://rdaregistry.info/Elements/m/carrierType.en> ; reg:name "carrierType"@en ; reg:status <http://metadataregistry.org/uri/RegStatus/1001> ; rdakit:instructionNumber "3.3" ; rdakit:toolkitDefinition "A categorization reflecting the format of the storage medium and housing of a carrier in combination with the type of intermediation device required to view, play, run, etc., the content of a resource."@en ; rdakit:toolkitLabel "carrier type"@en ; a rdf:Property ; rdfs:domain <http://rdaregistry.info/Elements/c/C10007> ; rdfs:isDefinedBy <http://rdaregistry.info/Elements/m/> ; rdfs:label "has carrier type"@en ; skos:definition "Relates a manifestation to a categorization reflecting the format of the storage medium and housing of a carrier in combination with the type of intermediation device required to view, play, run, etc., the content of a resource."@en .
  • 19. Multi-schema linked data Linking RDA to: ISBD MARC21 RDA/ONIX Framework …
  • 20. Unconstrained linked data Remove FRBR model to “dumb-down” semantics to common level of granularity “resources” and “agents” Example: Contributor Relates a resource to an agent contributing to a resource.
  • 21. Beyond RDA data: ISBD ISBDURDAU ISBDRDA Work Expression Manifestation Item Resource [Linked data cloud, not RDF graph] Unconstrained (No entity Specified)
  • 22. RDA linked data in action: Cervathon Hackathon for RDA data Using RIMMF software With output format for linked data (RDA/RDF)
  • 23. Conclusion RDA supports fine-grained linked data compatible with the FRBR model RDA supports extensions and refinements for cultural heritage data RDA supports the multilingual Semantic Web RDA supports linked data application developers RDA is linked data fun!