RDA: Data Recording and Linked Data Concepts
Explore the concepts of RDA (Resource Description and Access) focusing on data recording methods, linked data, and beyond. Learn about different types of recorded data, recording methods, and how RDA fits into the wider information landscape. Discover the relationship between RDA entities, standards, and the IFLA Library Reference Model.
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Presentation Transcript
RDA Community and linked data Gordon Dunsire LD4 Workshop, 1 May 2018
Kinds of recorded data RDA is designed to support a wide range of data carrier architectures for storage and display Flat-file: card and other print-based catalogues Local (Closed- world) Bib/Authority: MARC, etc. RDBMS: Table for each entity, row keys (IDs) Global (Open- world) RDF: Classes, properties, and IRIs RDA uses RDF to record data for RDA Reference (entities, elements, and vocabulary encoding schemes) RDA/RDF provides data for RDA Toolkit (Glossary, element reference, navigation) Available from RDA Registry under open license
RDA recording methods RDA provides instructions for four methods of recording data values: Unstructured description Transcription; free-form notes; uncontrolled human-readable appellation (name, title) Structured description Multiple values with string encoding scheme; value with syntax encoding scheme; controlled human-readable appellation (access point) Identifier Machine-readable appellation (local) IRI Machine-readable appellation (global) An appellation references an instance of an entity
Recording methods for related data Keyword index "note on related entity 2" "access point for related entity 2" Authority file RDA Entity 1 is related to Standard identifier system "identifier for related entity 2" Semantic Web RDA Entity 2
Strings, things, and Nomens has appellation has nomen string Entity (thing) nomen string" Nomen Status (VES) Timespan has status of identification has date of usage Name Authority file
Beyond RDA RDA is an implementation of the IFLA Library Reference Model rdfs:subClassOf RDA Entity LRM Res Domains and ranges of properties are specified as RDA entities RDA unconstrained properties do not specify domain or range Definition terms are given in the vernacular : no special meaning is intended for resource or agent . RDA rdfs:subPropertyOf RDA unconstrained (not LRM) property
Super-class of all RDA entities IFLA LRM and RDA entities Res is sub-class of has appellation RDA Entity Nomen Work is created Place Expression by is associated with Agent is sub-class Manifestation is modified by of Timespan Item Collective Agent Person LRM relationship refined as RDA element sub-type (RDF sub-property) Corporate Body Family
Ontology representation Canonical property (no range) is sub-property of Datatype property (Literal/string range) Object property (specific/thing range) Unstructured description Structured description with associated string/syntax encoding scheme Identifier with associated string/syntax encoding scheme Range = RDA entity for IRI of instance of related entity Range = VES class for IRI of concept from vocabulary encoding scheme Each type of property is in a separate element set with shared local identification (URI part)
Extending/refining RDA Element Entity RDA class Alternative label RDA property Narrower class Narrower property Value RDA Vocabulary Alternative vocabulary Alternate label RDA Term/Concept Narrower term
Linking RDA data RDA uses RDF maps to link RDA entities, elements, and terms to external vocabularies Map = set of mappings between source and target elements, etc. Usually published in Terse Triple Language or N-triple serializations If there is no target representation in RDF, map is published as an alignment (data crosswalk, not linked data)
Thank you! rscchair@rdatoolkit.org http://www.gordondunsire.com/presentations.htm
