Presentation on theme: "Authority control, new library standards, and the Semantic Web Gordon Dunsire Presented to the Authority Control Interest Group (ACIG) meeting, ALA Annual,"— Presentation transcript:
Authority control, new library standards, and the Semantic Web Gordon Dunsire Presented to the Authority Control Interest Group (ACIG) meeting, ALA Annual, New Orleans, 26 June 2011
Overview RDA, FRBR, FRAD and authority control Extending authority control concepts to data linking Linked data and the Semantic Web
Title:Cataloguing is fun! Author:Mary MacDonald Content type: Media type: LCSH: microform text Cataloging Bibliographic record: 12345Name authority record: 8765 Heading:MacDonald, Mary Place of birth:Edinburgh LCSH authority record: 5432 Heading:Cataloging See also:Books RDA content type record: 1234 Term:text Definition:Content expressed through a form of notation for language intended to be perceived visually. ISBD media type record: 5432 Term:microform Definition:Media used to store reduced-size images, not readable to the human eye, and designed for use with a device such as a microfilm or microfiche reader
Title:Cataloguing is fun! Author: Content type: Media type: LCSH: Bibliographic record: Name authority record: 8765 Heading:MacDonald, Mary Place of birth: Author 8765Place of birth HeadingMacDonald, Mary9876NameEdinburgh 9876Country4567 Stop! Ambiguous: link not safe. Identifier: ok to link. 8765HeadingMacDonald, Mary Author8765Place of birth9876 NameEdinburgh Author8765Place of birth9876 Country4567
Linked data is not a new idea! It extends concepts of authority control Preferred labels Create/maintain once; link many times Re-use of metadata More than one attribute associated with a heading E.g. Place of birth of person with name heading Concepts can be applied to authority records As well as bibliographic description records Full extension leads to record dis-aggregation All records in bibliographic control systems
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 Simplicity helps! Machine-readable identifiers
RDF triple Metadata expressed as atomic statements A simple, single, irreducible statement The title of this book is Cataloguing is fun! Constructed in 3 parts Triple The title of this book is Cataloguing is fun! Subject of the statement = Subject: This book Nature of the statement = Predicate: has title Value of the statement = Object: Cataloguing is fun! This book – has title – Cataloguing is fun! subject – predicate - object
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)
Uniform Resource Identifier Can be any unique combination of numbers and letters No intrinsic meaning; its just an identifier Can look like a URL But does not lead to a Web page (in principle...) RDF requires the subject and predicate of triple to be URIs Object can be a URI, or a literal string (Cataloguing is fun!)
RDF properties Predicates are called properties in RDF Verbal part of the metadata statement E.g. A has author B, B has heading... Properties link specific instances of two things A = a specific book, B = a specific person... = a specific label, character string, annotation => a literal Properties are the links in linked data, the pathways through the Semantic Web to human- readable metadata
Labels, global identifiers, linked data Headings can be managed in the same way as other controlled vocabularies They are all RDF labels Global identifiers (URIs) and RDF allow distributed authority control But without need to copy and maintain in local systems Different labels for the same thing can be linked, and a chain can link a label to a resource Its all linked data...
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