Linking Folksonomies to Knowledge Organization Systems

Linking Folksonomies to Knowledge Organization Systems Jakob Voß (VZG) Metadata and Semantic Research (MTSR), November 30th, 2012

Social Tagging and FolksonomiesWikipedia and Stack ExchangeLinking Folksonomies to KOSResults

Section 1Social Tagging and Folksonomies

Social Tagging Keywords/tags manually assigned to documents by members of a distributed community of volunteers Tags freely chosen (or easy to create new) Outcome of tagging activity in a tagging system: Folksonomy

Properties of Social Tagging Tagging systems are very dynamic — especially compared to normal KOS Diﬀerent types of tagging systems exist: — don’t compare apples and oranges! source of resources tagging rights, tagging support, tag management tag aggregation tag connectivity

Tag aggregation: Bag-Model

Tag aggregation: Set-Model

Folksonomies in set-model tagging systems Dynamic knowledge organization systems created by communities of distributed volunteers Directly given as snapshot of community consensus Limited awareness among community members Two popular examples: Categories in Wikipedia Tags in Stack Exchange

Section 2Wikipedia and Stack Exchange

Categories in Wikipedia

folksonomy is a thesaurus

Tags in Stack Exchange tags in a question anyone can edit tags (after a while) folksonomy is a ﬂat ﬁle of keywords (with some synonyms)

Section 3Linking Folksonomies to KOS

Knowledge Organization Systems (KOS) Classiﬁcations, thesauri, taxonomies, authority ﬁles. . . Common model of KOS for exchange and interlinking: Simple Knowledge Organization System (SKOS): <http://example.org/a> a skos:Concept ; skos:broader <http://example.org/b> ; skos:narrower <http://example.org/c> ; skos:related <http://example.org/d> ; skos:exactMatch <http://example.com/A> ; skos:closeMatch <http://example.com/aa> .

Harvest and SKOSify folksonomy

Additional links from tag names Reuse of Computing Research Repository (CoRR) notations

Mapping to CoRR classiﬁcation @prefix cst: <http://cstheory.stackexchange.com/tags/> . [ skos:notation "LO"; skos:prefLabel "Logic in Computer Science"@en ] skos:closeMatch cst:lo.logic . [ skos:notation "DS" ; skos:prefLabel "Data Structures and Algorithms"@en ] skos:narrowMatch cst:ds.algorithms , cst:ds.data-structures .

Feedback of enrichment and links into the community

Enrichtment of tag description in Wikipedia

Enrichtment of tag description in Wikipedia <http://de.dbpedia.org/resource/Kategorie:H%C3%B6rspiel> a skos:Concept ; skos:prefLabel "H¨rspiel"@de ; o skos:narrowMatch <http://data.bib.uni-mannheim.de/data/rvk/AP_36320> , <http://data.bib.uni-mannheim.de/data/rvk/EC_7980> ; skos:closeMatch <http://dewey.info/class/791.447/> , # DDC <http://d-nb.info/gnd/4025435-5> . # GND

Enrichtment of tag description in Stack Exchange

Enrichtment of tag description in Stack Exchange @prefix libse: <http://libraries.stackexchange.com/tags/> libse:ils a skos:Concept ; skos:broader libse:software ; skos:narrower libse:circulation> , libse:collection-management , libse:cataloging> , libse:opac ; skos:closeMatch <http://dbpedia.org/resource/Integrated_library_system> <http://id.loc.gov/authorities/subjects/sh95003216> , <http://eprints.rclis.org/handle/10760/3775> , <http://d-nb.info/gnd/4583297-3> .

Feedback of enrichment and links into the community Feedback with additional benefit: find related documents One must be able to directly link to a rich collected of documents indexed with the concept notation/identifier of each KOS

Section 4 Results

hierarchical links

Mappings to other KOS Published in SKOS/RDF as shown Simple mappings in form of BEACON ﬁles #PREFIX: http://libraries.stackexchange.com/tags/ #RELATION: http://www.w3.org/2004/02/skos/core#closeMatch ils|http://dbpedia.org/resource/Integrated_library_system ils|http://id.loc.gov/authorities/subjects/sh95003216 ils|http://eprints.rclis.org/handle/10760/3775 ils|http://d-nb.info/gnd/4583297-3 archives|http://eprints.rclis.org/handle/10760/3660

Outcome and Beneﬁts Show related documents guide people from communities to collections Catalog enrichment guide people from collections to communities Collection analysis

Compare collections with measuring at one KOS Collection of papers at arXiv.org compared to question at theoretical computer science Stack Exchange: complexity theory is asked much more then published information theory is published much more then asked about

References Scripts and data harvested available at http://github.com/nichtich/se2skos. Source of paper and slides available at http://github.com/jakobib/mtsr2012. Both Wikipedia and Stack Exchange data available under CC-BY-SA accessible via open APIs: http://stackapps.com/ http://en.wikipedia.org/w/api.php Icons CC-BY based on picol.org

Linking Folksonomies to Knowledge Organization Systems

von Jakob . am 30. November 2012

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