Corey A Harper DC2006 October 4, 2006 Authority Control for the Semantic Web Encoding Library of Congress Subject Headings (LCSH) in SKOS.

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Presentation transcript:

Corey A Harper DC2006 October 4, 2006 Authority Control for the Semantic Web Encoding Library of Congress Subject Headings (LCSH) in SKOS

2 Outline Library Controlled Vocabularies and the Semantic Web Library of Congress Subject Headings Encoding: MARC, MADS, SKOS XML & XSLT: Intentions and Problems Alternate Approaches Conclusion - Benefits, Related & Future Work

3 “The vast bulk of data to be on the Semantic Web is already sitting in databases … all that is needed [is] to write an adapter to convert a particular format into RDF and all the content in that format is available.” - Tim Berners-Lee in an interview with the Consortium Standards Bulletin

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

5 Library Controlled Vocabularies: Drawbacks Overly Complicated - extraneous information Archaic Syntax - MARC Records Slow to evolve - authorities control the authority control

6 LCSH

7 LCSH in Dublin Core Encoding Scheme for DC Subject No easy way to draw on equivelent terms and cross-references Abstract Model, RDF and SKOS could enable applications to make use of the whole vocabulary

8 Vocbaluary Encodings MARC - Great for Library Applications MARC-XML MADS SKOS - Designed for use with RDF } Helping Get Library Apps online

9 LCSH in SKOS World Wide Web W3 (World Wide Web) Web (World Wide Web) World Wide Web (Information Retrieval System)

10 XML to XML MARC can be represented as XML SKOS can be represented as XML XSLT is easy and effective MARC-XML to MADS exists (in Beta) Should be easy, right…

11 WRONG!

12 Many Challenges Records only include broader terms References identified by Label, not ID Pre-coordinated subject strings What to keep, what to exclude? Inconsistent identifier format

13 Alternate Approaches X-Query - Allows parsing of XML in chunks rather than tree based X-Path Intermediary structures: –Internal to a scripting language like Perl –Using a relational database

14

15 Expected Benefits Common RDF Semantics Many Possible Web Services Publish Vocabulary in Multiple Formats –Ease of re-use Entertainment

16 Related Work OCLC’s Terminology Services Project NSDL Registry Project

17 Next Steps Finish parsing using an intermediary Discuss publishing options with LC Publish LCSH-SKOS as a test case Experiment with FAST SKOS extensions to represent additional data Experiment with other Library Vocabs Test web-services and tools

18 Tools and Web Services SRU/SRW Use to enhance metadata creation and search Facilitate Controlled Vocabularies in Social Tagging Environments

Corey A Harper DC2006 October 4, 2006 Thank You Any Questions