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An introduction to RDF and library linked data Gordon Dunsire Presented at the Dewey Decimal Classification Executive Briefing 15 Sep 2011, London.

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Presentation on theme: "An introduction to RDF and library linked data Gordon Dunsire Presented at the Dewey Decimal Classification Executive Briefing 15 Sep 2011, London."— Presentation transcript:

1 An introduction to RDF and library linked data Gordon Dunsire Presented at the Dewey Decimal Classification Executive Briefing 15 Sep 2011, London

2 Semantic Web  “machine-readable metadata”  Faster! 24/7/365! Global!  In a standard machine-processable format  Resource Description Framework (RDF)  RDF supports simple, single metadata statements known as triples  Each statement is in 3 parts

3 RDF triple  The title of this book is “Physics is fun”  Subject of the statement = Subject: This book  Nature of the statement = Predicate: (has) title  Value of the statement = Object: “Physics is fun”  This book – has title – “Physics is fun”  subject – predicate – object  This presentation – has author – Gordon Dunsire  This seminar – has subject – DDC:

4 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, global  Uniform Resource Identifier (URI)

5 Uniform Resource Identifier  Can be any unique combination of numbers and letters  No intrinsic meaning; it’s just an identifying label  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 (“Physics is fun”)

6 Identifying library metadata  Represent library schema attributes and relationships as RDF properties (= predicates)  Each property has own URI (from namespace)  Resource Description and Access (RDA), International Standard Bibliographic Description (ISBD), Functional Requirements for Bibliographic Records (FRBR), etc.  Assign URIs to specific library resources  The things described in catalogues  Books, a-v materials, digital resources, etc.  The terms used to describe them  Vocabularies, subject headings, classifications, etc.

7 This bookhas title“Physics is fun” BookURI hasTitleURI“Physics is fun” has author Jim Jardine BookURI hasAuthorURIJimJardineURI hasNNameURI“Jardine, Jim”JimJardineURI hasBirthPlaceURIPlaceURI hasCoordinatesURI“abcxyz”BookURI hasDDCURIddc530URI

8 BookURI“Physics is fun” hasTitleURI title “Physics is fun” Jim Jardine Place X ddc530URI This book author “Jardine, Jim” “abcxyz” birthplace normalised name coordinates DDC “Physics” location caption “Fiosaigs”

9 Library linked data in RDF  Machine-match URIs of triple subjects to obtain set of statements about one thing  A “record” for that thing  Information resource or something associated with it  Machine-match object URI of one triple to subject URI of another to obtain chain of connected statements  Linked data chain can lead to data from outside of library community

10 Benefits of linked data to libraries  Use of data created and maintained by others  Global scale  Sharing of high-quality metadata created by libraries (trillions of triples)  Bibliographic records; authority files  Statement-level granularity allows flexible display of metadata to suit user requirements  Chains go both ways, leading users from external environments to library collections

11 Thank you  W3C Library Linked Data Incubator Group  Final report available via wiki:  


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