Document (#27938)

Author
Bekavac, B.
Title
Metainformationsdienste des Internet
Source
Grundlagen der praktischen Information und Dokumentation. 5., völlig neu gefaßte Ausgabe. 2 Bde. Hrsg. von R. Kuhlen, Th. Seeger u. D. Strauch. Begründet von Klaus Laisiepen, Ernst Lutterbeck, Karl-Heinrich Meyer-Uhlenried. Bd.1: Handbuch zur Einführung in die Informationswissenschaft und -praxis
Imprint
München : Saur
Year
2004
Pages
S.399-407
Abstract
Diverse Metainformationsdienste, allen voran natürlich die Suchmaschinen, ermöglichen das Auffinden von Informationen im Internet. Diese Aufgabe ist nicht leicht, denn die Problematik liegt nicht nur darin, dass inzwischen Milliarden von Dokumenten über das Internet zugreifbar sind, sondern auch in der hohen Dynamik bezüglich neuer oder geänderter Inhalte, den heterogenen Datenformaten und medialen Formen und uneinheitlich strukturierten Inhalten, einer großen Vielfalt an unterschiedlichen natürlichen Sprachen zur Bildung der textuellen Daten sowie einer hohen Anzahl von Dokument-Dubletten, die u.a. durch das Kopieren (Spiegeln bzw. Mirroring) von Inhalten zu Stande kommen. Die Web-Seiten der zahlreichen Anbieter sind nicht nur inhaltlich umfangreich, sondern auch vom Aufbau her komplex. Oft kommt der Text aus Deutschland, die Grafiken z.B. aus den USA. Die angegebenen Links führen dann nach England oder Japan. Die Quellen der publizierten Informationen spielen dabei nur eine untergeordnete Rolle. Kann man sich bei kommerziellen Online-Datenbanken noch weitgehend sicher sein, dass hinter den Informationsbeständen seriöse und kompetente Produzenten und Anbieter stehen, so ist die Einspeisung von Informationen in das WWW prinzipiell von jeder Person möglich, der Speicherplatz auf einem Web-Server (i.d.R. Provider oder Arbeitgeber) zur Verfügung steht. Beim Betrachten der multimedialen WWW-Dokumente ist die inhaltliche Kompetenz der dahinterstehenden Autoren daher nur schwer abzuschätzen, oft können diese nicht einmal eindeutig bestimmt werden. Von einer Konsistenz im Sinne von Wiederauffindbarkeit, Aktualität oder gar Qualität der Informationsbestände im WWW kann nicht die Rede sein. Inhalte einzelner WWW Seiten oder deren URLs werden laufend verändert bzw. gelöscht. Die zentralen Technologien des WWW, das Übertragungsprotokoll HTTP und die Seitenbeschreibungssprache HTML bieten weder die Möglichkeit einer automatischen Aktualisierung der auf diese Seiten verweisenden Hyperlinks noch kann ein tatsächliches Erstellungs- bzw. Änderungsdatum für die Inhalte der einzelnen Dokumente identifiziert werden. Nützliche formal-inhaltliche Dokumentattribute wie Titel, Autor, Erscheinungsjahr usw. sind im WWW häufig nicht vorhanden oder unzutreffend und sind, wenn überhaupt, nur über die Inhalte der WWW Dokumente selbst ausfindig zu machen. Alle diese Eigenschaften erschweren zusätzlich zu der immensen im Web verfügbaren Dokumentenmenge die Suche und Lokalisierung von Informationen.
Auf der anderen Seite stehen Benutzer, die nach Eingabe weniger Suchbegriffe von den Suchmaschinen wahre Wunder in Form von relevanten Dokumenten erwarten. Jedoch ist die Dokumentmenge, die zu den eingegebenen Suchbegriffen passt, nicht selten so groß, dass es für die Benutzer zu aufwändig wäre sich alles anzuschauen. Die von den Suchmaschinen angewandten Sortierverfahren (Ranking), welche versuchen die relevantesten Dokumente unter den ersten Plätzen der Ergebnisseiten zu platzieren, scheitern zu oft an der großen "Ähnlichkeit" der Dokumente. Alternativ zu den Suchmaschinen können auch Web-Kataloge bzw. -Verzeichnisse verwendet werden, über die ganz bestimmte Interessensgebiete gezielt angesteuert werden können. Der größte Vorteil hierbei ist sicherlich der Kontext der gefundenen Informationen, der sich durch die ausgewählten Rubriken und Sachgebiete während der Navigation widerspiegelt. Nachteilig ist die sehr geringe Abdeckung des weltweiten Informationsraumes, da Kataloge im Gegensatz zu den Suchmaschinen die Quell-Informationen nicht automatisiert beziehen. Ganz anders hingegen Meta-Suchdienste, die selbst weder einen eigenen Index besitzen noch sich Gedanken über eine inhaltliche Strukturierung des Internet machen. Sie befragen ganz einfach andere Metainformationsdienste verschiedenster Art und sehen ihre Leistung in der benutzergerechten Zusammenführung der erhaltenen Treffermengen. Auch wenn die Suchoberflächen der im Internet befindlichen Suchdienste in der Regel mehrere der hier genannten Suchmöglichkeiten anbieten, die dahinter verborgenen Suchverfahren, vor allem die Gewinnung von Metainformationen, sind recht unterschiedlich.
Theme
Internet
Suchmaschinen

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