Document (#31714)

Author
Strötgen, R.
Title
Anfragetransfers zur Integration von Internetquellen in Digitalen Bibliotheken auf der Grundlage statistischer Termrelationen
Source
http://www.opus-bayern.de/bib-info/volltexte/2007/291/pdf/2007-bid-leipzig-stroetgen-asemos-paper.pdf
Year
2007
Abstract
In Digitalen Bibliotheken als integrierten Zugängen zu in der Regel mehreren verschiedenen Dokumentsammlungen tritt Heterogenität in vielerlei Spielarten auf: - als technische Heterogenität durch das Zusammenspiel verschiedener Betriebs-, Datenbank- oder Softwaresysteme, - als strukturelle Heterogenität durch das Auftreten verschiedener Dokumentstrukturen und Metadaten-Standards und schließlich - als semantische Heterogenität, wenn Dokumente mit Hilfe unterschiedlicher Ontologien (hier verwendet im weiteren Sinn von Dokumentationssprachen wie Thesauri und Klassifikationen) erschlossen wurden oder aber Dokumente überhaupt nicht mit Metadaten ausgezeichnet wurden. Semantische Heterogenität lässt sich behandeln, indem die Standardisierung von Metadaten (z.B. von der Dublin Core Metadata Initiative oder das Resource Description Framework (RDF) im Kontext des Semantic Web) vorangetrieben und ihre Verwendung gefördert wird. Allerdings besteht auf Grund der unterschiedlichen Interessen aller beteiligten Partner (u.a. Bibliotheken, Dokumentationsstellen, Datenbankproduzenten, "freie" Anbieter von Dokumentsammlungen und Datenbanken) kaum die Aussicht, dass sich durch diese Standardisierung semantische Heterogenität restlos beseitigen lässt. Insbesondere ist eine einheitliche Verwendung von Vokabularen und Ontologien nicht in Sicht. Im Projekt CARMEN wurde unter anderem das Problem der semantischen Heterogenität einerseits durch die automatische Extraktion von Metadaten aus Internetdokumenten und andererseits durch Systeme zur Transformation von Anfragen über Cross-Konkordanzen und statistisch erzeugte Relationen angegangen. Ein Teil der Ergebnisse der Arbeiten am IZ Sozialwissenschaften waren statistische Relationen zwischen Deskriptoren, die mittels Kookurrenzbeziehungen berechnet wurden. Diese Relationen wurden dann für die Übersetzung von Anfragen genutzt, um zwischen verschiedenen Ontologien oder auch Freitexttermen zu vermitteln. Das Ziel dieser Übersetzung ist die Verbesserung des (automatischen) Überstiegs zwischen unterschiedlich erschlossenen Dokumentbeständen, z.B. Fachdatenbanken und Internetdokumenten, als Lösungsansatz zur Behandlung semantischer Heterogenität.
Content
Vortrag anlässlich des 96. Deutscher Bibliothekartag, Leipzig, 2007. - Vgl. auch den Bericht: Fiala, S.: Deutscher Bibliothekartag Leipzig 2007: Sacherschließung - Informationsdienstleistung. In: Mitt. VOEB 60(2007) H.2, S.44-48 (hier: 45-46).
Theme
Semantische Interoperabilität
Object
Carmen

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