RDA and Linked Data Gordon Dunsire Presented at Selmathon 1, 9 May 2016, Stockholm, Sweden.

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Presentation transcript:

RDA and Linked Data Gordon Dunsire Presented at Selmathon 1, 9 May 2016, Stockholm, Sweden

Overview  Introduction: basic linked data  RDA Registry & RDA Reference  FRBR-LRM

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 

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

Complexity of relationships: Moby Dick Ronald J. Murray: From Moby Dick to mash-ups Printed editions “OrsonWhales” mash-up (YouTube) Diagram using FRBR entities and relationships

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

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 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 ( Fine granularity audit trail

Machine views of RDA elements reg:hasUnconstrained ; reg:lexicalAlias ; reg:name ; reg:status ; 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 ; rdakit:toolkitLabel "carrier ; a rdf:Property ; rdfs:domain ; rdfs:isDefinedBy ; rdfs:label "has carrier ; 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

Multilingual linked data French German Spanish Chinese …

Multilingual data German translationSwedish workEnglish cataloguer

French cataloguer Polylingual data

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.

LRM “a high-level conceptual model … intended as a guide or basis on which to elaborate cataloguing rules” FRBR-LRM and RDA RDA guidance, instructions, elements LRM “this model is developed very much with semantic web technologies in mind” RDA linked data communities “operates at a greater level of generality than FRBRoo, which seeks to be comparable in terms of generality with CIDOC CRM” RDA cultural heritage communities

ResNomen has appellation PlaceTimespan Collective agent FC Agent W E M I P is created by is associated with is type of Any Thing: Covers all other types of thing is modified by FRBR-LRM and RDA entities RDA refines LRM relationships as element sub-types (RDF sub-properties)

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!  