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Linked Library Data

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Linked Library Data Tuning Library Metadata for the [Semantic] Web Presented 2011-03-16 ALCTS RDA Webinar Series Corey A Harper Topical Overview Semantic Web & RDF ... – PowerPoint PPT presentation

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Title: Linked Library Data


1
Linked Library Data
  • Tuning Library Metadata for the Semantic Web

Presented 2011-03-16ALCTS RDA Webinar Series  
Corey A Harper
2
Topical Overview
  • Semantic Web RDF Intro
  • Linked Open Data
  • Linked Library Data
  • Resource Description and Access (RDA)
  • Beyond MARC
  • As RDF Vocabularies
  • Broader Interoperability
  • Small steps forward

3
Semantic Web
  • TBLs original vision
  • Weaving the Web 1999
  • Then Focus on Machine Reasoning
  • Scientific American Article
  • Now Focus on things links
  • Reasoning Inferencing less central

4
Semantic Web
  • Originally
  • Metadata standard built on XML
  • Metadata about Web things (documents)
  • Eventually
  • Metadata about all sorts of things
  • And about relationships between things
  • What are the things?

5
Semantic Web Terminology
  • Resource Any thing
  • Class Abstraction of a type of thing
  • Individual An instance of a class
  • Property An attribute of an individual
  • Statement/Triple
  • A Resource (subject)
  • A Property (predicate / verb)
  • A Value (object) - Nodes
  • Graph Visual Representation of statements
  • Ontology A domain specific collection of classes
    and properties

6
Semantic Web Terminology
  • Nodes The Subjects and Objects in a Graph
  • Arcs The Predicates in a Graph
  • Domains and Ranges Constraints on Nodes
  • Domain What things can be subjects
  • Range What things (or strings) can be objects
  • Literals Values as strings rather than things
  • Named Graphs Graphs with URIs treated as nodes.

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8
Linked Open Data
  • Use URIs as names for things
  • Use HTTP URIs so that people can look up those
    names.
  • When someone looks up a URI, provide useful
    information.
  • Include links to other URIs. so that they can
    discover more things.
  • http//www.w3.org/DesignIssues/LinkedData.html

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12
Data in the Cloud
  • Hubs in the May 2008 Version
  • FOAF
  • DBPedia
  • Myriad Sources coming online
  • Thompson Reuters
  • New York Times
  • British Broadcasting Corporation
  • Government Data (UK, US and more)
  • Google and Facebook
  • More and More Library, Archive and Museum Data
  • Geonames
  • MusicBrains

13
DBpedia
  • Structured Wikipedia Data
  • Genres, Influences, External Links
  • Multi-lingual / Multi-script labels
  • Rich Semantics
  • Many linkages to other datasets

14
DBpedia Model
  • Partial basis in data entry conventions
  • InfoBoxs, and InfoBox Templates
  • Metadata Entry Format
  • Partial source of Ontology
  • Class Structure
  • Vocabulary Design

15
DBpedia
  • 3.4 Million things described
  • Ontology based on infoboxes
  • 1.5 million things classified
  • http//wiki.dbpedia.org/Ontology
  • Approx. 50,000 Properties
  • Approx. 1,200 defined in ontology

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19
What things are in our data???
20
Librarydata is extremely complicated
21
Library Metadata
  • Rich stores of MARC, MODS, c.
  • Robust Controlled Vocabularies
  • Subject Heading lists
  • Code lists
  • Thesauri
  • Emerging data model in FR

22
Bibliographic Vocabs
  • Bibliographic Ontology (Bibo)
  • Zotero, Omeka, EPrints and Others
  • FRBR unofficial
  • And now Official (Thank you IFLA!)
  • ISBD
  • Resource Description and Access (RDA)

23
Linked Library Archive, Museum Data
  • LIBRIS (Swedish Union Catalog)
  • Library of Congress (LCSH, OSI)
  • German National Library
  • Hungarian National Library
  • British Library
  • Europeana
  • Archives Hub LOCAH

24
Library Authority Data
  • Include links to other URIs. so that they can
    discover more things.
  • Short of providing and linking to URIs, this is
    authority data.
  • This is what our authority files are for.

25
Library Controlled Vocabularies Benefits
  • Reputation - Trusted Tradition
  • Mature - Time tested and carefully developed
  • General Comprehensive - Cover large knowledge
    spaces

26
SKOS
  • Simple Knowledge Organization System
  • Properties and Classes for describing Controlled
    Vocabulary
  • Heavily used in Linked Library Data
  • id.loc.gov
  • Virtual International Authority File (VIAF)

skosprimaryTopic
bibobook
skossubject
27
Other Vocabularies
  • Thesaurus for Economics
  • French Subject Headings
  • Swedish Subject Headings
  • IconClass (not on web yet)
  • OCLC Terminology Services
  • Dewey Decimal Classification
  • Virtual International Authority File
  • Metadata Authority Description Schema (MADS)

28
Resource Description and Access
  • Current focus on MARC
  • Much criticism
  • Within MARC, not a tremendous change
  • Different problems outside of MARC
  • Possible focus outside of MARC
  • RDA as realization of FRBR
  • RDA as Metadata Vocabularies
  • RDA as related to Bibo

29
RDA as Metadata Vocabularies
Slide Adapted from Diane Hillmann
  • RDA elements, roles and vocabularies have been
    provisionally registered
  • IFLA FRBRer and ISBD elements and vocabularies
    have been officially registered
  • Discussions about long term maintenance of both
    RDA and the vocabularies
  • Effort to create multi-language RDA Vocabularies

30
Metadata Registries
  • Formerly NSDL Registry
  • Now Open Metadata Registry
  • Managing Vocabularies
  • Providing Vocabulary Services
  • RDA Now adding translations
  • IFLA Work
  • FRBR, FRAD, FRSAD, ISBD

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35
RDA as realization of FRBR
  • What will this look like?
  • Probably wont be stored in MARC
  • Overly constrained by FRBR?
  • Properties have FRBR domains ranges
  • Unofficial Generalized properties
  • Non-FRBR metadata
  • Similar to DCMIs range constraints

36
Support Free Range Metadata!
Photo Credit http//www.flickr.com/photos/ciwf/32
17378769/
37
BIBO and RDAVocab
  • Open question re alignment
  • Simplified view of Bib Data is useful
  • Interlinking with more general data
  • Interlinking with non-library domain data
  • FRBR as internal model for library domain
  • Examples

38
Why Does This Matter?
  • Our descriptions no longer stand alone!
  • Connect our data with the rest of the WEB
  • Allow others to reuse more easily
  • FOAF, Geonames
  • DBPedia
  • MusicBrains
  • New York Times, Thomson Reuters
  • Government Data - data.gov
  • British Broadcasting Corporation
  • Other Library, Archive and Museum Data

39
Conclusions
  • Distributed bibliographic control environment
  • Linking Data
  • Focus on identification over description
  • In short, by treating values as non-literal
    resources and assigning URIs to them we give
    ourselves (and others) the hooks on which to hang
    further descriptions. - Andy Powell

40
Future Work
  • Records in Linked Library Data
  • Vocabulary Alignment and Interoperability
  • DCMI planning in this space
  • General Metadata Interoperability
  • Application Profiles?
  • Archival Data for context - (EAC-CPF)

41
W3C Linked Library Data Incubator
  • Collecting, Curating and Clustering over 50 Use
    Cases
  • Mining use cases for functional requirements and
    design patterns
  • Recommendations to W3C
  • Should lead to Working Groups
  • http//www.w3.org/2005/Incubator/lld/

42
Other Activities
  • ALCTS/LITA Linked Library Data IG
  • IFLA Semantic Web IG
  • https//wiki.d-nb.de/x/vA10Ag
  • Open Knowledge Foundation
  • http//okfn.org/
  • CKAN Linked Library Data Group
  • http//ckan.net/group/lld

43
Thanks!
Questions?
  • corey.harper_at_nyu.edu
  • 212.998.2479
  • _at_chrpr
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