-
Niederée, C.: Metadaten als Bausteine des Semantic Web (2003)
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- Abstract
- Das »Semantic Web« bildet einen der wichtigsten, aktuellen Trends in der Weiterentwicklung des World Wide Web. Ehrgeizige Vision dieser nächsten Generation des WWW ist es, durch semantische Anreicherung von Information eine neue Qualität in der Bereitstellung von Inhalten und Diensten zu erreichen und vollständig neue Anwendungsmöglichkeiten für das Web zu eröffnen. Wichtige Ziele der Entwicklung des Semantic Web sind dabei die verbesserte Unterstützung von Kooperation zwischen Menschen und Computern und die intelligente Assistenz bei der Durchführung von Aufgaben in kooperativen verteilten Informationsumgebungen. Schlüssel zur Erreichung dieser Ziele sind die Anreicherung von Daten im Web mit Metadaten, welche diese Daten in einen semantischen Kontext einbetten. Diese Kontextinformation wird durch Software-Anwendungen interpretiert und zur Informationsfilterung, Verfeinerung von Anfragen und zur Bereitstellung intelligenter Assistenten verwendet. Eine große Herausforderung stellt dabei die geeignete Modellierung und Beschreibung des Kontexts dar. Diese muss eine automatische, globale Interpretation ermöglichen, ohne dass auf ein allgemeingültiges semantisches Beschreibungsschema zurückgegriffen werden kann. Die Vereinbarung eines solchen allgemeingültigen Schemas ist in einem derart umfangreichen, heterogenen und autonomen Rahmen, wie ihn das WWW darstellt, nicht möglich.
- Theme
- Semantic Web
-
Söhler, M.: "Dumm wie Google" war gestern : semantische Suche im Netz (2011)
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- Abstract
- "Casablanca" bringt bei der Google-Suche Millionen Ergebnisse. Ist die Stadt gemeint oder der Film? Suchmaschinen sind dumm und schnell. Schema.org will das ändern.
- Content
- "6.500 Einzelsprachen so zu verstehen, dass noch die dümmsten Maschinen sie in all ihren Sätzen, Wörtern, Bedeutungen nicht nur erfassen, sondern auch verarbeiten können - das ist ein komplexer Vorgang, an dem große Teile des Internets inklusive fast aller Suchmaschinen bisher gescheitert sind. Wem schon der gerade gelesene Satz zu komplex erscheint, dem sei es einfacher ausgedrückt: Erstmal geht es um "Teekesselchen". Wörter haben oft mehrere Bedeutungen. Einige kennen den "Kanal" als künstliche Wasserstraße, andere kennen ihn vom Zappen am Fernsehgerät. Die Waage kann zum Erfassen des Gewichts nützlich sein oder zur Orientierung auf der Horoskopseite einer Zeitung. Casablanca ist eine Stadt und ein Film zugleich. Wo Menschen mit der Zeit zu unterscheiden lernen, lernen dies Suchmaschinen von selbst nicht. Nach einer entsprechenden Eingabe listen sie dumpf hintereinander weg alles auf, was sie zum Thema finden können. "Dumm wie Google", könnte man sagen, "doof wie Yahoo" oder "blöd wie Bing". Damit das nicht so bleibt, haben sich nun Google, Yahoo und die zu Microsoft gehörende Suchmaschine Bing zusammengetan, um der Suche im Netz mehr Verständnis zu verpassen. Man spricht dabei auch von einer "semantischen Suche". Das Ergebnis heißt Schema.org. Wer die Webseite einmal besucht, sich ein wenig in die Unterstrukturen hereinklickt und weder Vorkenntnisse im Programmieren noch im Bereich des semantischen Webs hat, wird sich überfordert und gelangweilt wieder abwenden.
- Neue Standards Doch was hier entstehen könnte, hat das Zeug dazu, Teile des Netzes und speziell die Funktionen von Suchmaschinen mittel- oder langfristig zu verändern. "Große Player sind dabei, sich auf Standards zu einigen", sagt Daniel Bahls, Spezialist für Semantische Technologien beim ZBW Leibniz-Informationszentrum Wirtschaft in Hamburg. "Die semantischen Technologien stehen schon seit Jahren im Raum und wurden bisher nur im kleineren Kontext verwendet." Denn Schema.org lädt Entwickler, Forscher, die Semantic-Web-Community und am Ende auch alle Betreiber von Websites dazu ein, an der Umgestaltung der Suche im Netz mitzuwirken. "Damit wollen Google, Bing und Yahoo! dem Info-Chaos im WWW den Garaus machen", schreibt André Vatter im Blog ZBW Mediatalk. Inhalte von Websites sollen mit einem speziellen, aber einheitlichen Vokabular für die Crawler der Suchmaschinen gekennzeichnet und aufbereitet werden. Indem Schlagworte, so genannte Tags, in den Code von Websites eingebettet werden, sind Suchmachinen nicht mehr so sehr auf die Analyse der natürlichen Sprache angewiesen, um Texte inhaltlich zu erfassen. Im Blog wird dies als "Semantic Web light" bezeichnet - ein semantisches Web auf niedrigster Ebene. Aber selbst das werde "schon viel bewirken", meint Bahls. "Das semantische Web wird sich über die nächsten Jahrzehnte evolutionär weiterentwickeln." Einen "Abschluss" werde es nie geben, "da eine einheitliche Formalisierung von Begrifflichkeiten auf feiner Stufe kaum möglich ist."
- "Gemeinsames Format für strukturierte Daten" Aber warum sollten Google, Yahoo und Bing plötzlich zusammenarbeiten, wo doch bisher die Konkurrenz das Verhältnis prägte? Stefan Keuchel, Pressesprecher von Google Deutschland, betont, alle beteiligten Unternehmen wollten "ein deutliches Zeichen setzen, um die Qualität der Suche zu verbessern". Man entwickele "ein gemeinsames Format für strukturierte Daten, mit dem Dinge ermöglicht werden, die heute noch nicht möglich sind - Stichwort: semantische Suche". Die Ergebnisse aus Schema.org würden "zeitnah" in die Suchmaschine integriert, "denn einen Zeitplan" gebe es nicht. "Erst mit der Einigung auf eine gemeinsame Sprache können Suchmaschinen einen Mehrwert durch semantische Technologien generieren", antwortet Daniel Bahls auf die Frage nach Gemeinsamkeit und Konkurrenz der Suchmaschinen. Er weist außerdem darauf hin, dass es bereits die semantische Suchmaschine Sig.ma gibt. Geschwindigkeit und Menge der Ergebnisse nach einer Suchanfrage spielen hier keine Rolle. Sig.ma sammelt seine Informationen allein im Bereich des semantischen Webs und listet nach einer Anfrage alles Bekannte strukturiert auf."
-
Söhler, M.: Schluss mit Schema F (2011)
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- Abstract
- Mit Schema.org und dem semantischen Web sollen Suchmaschinen verstehen lernen
- Content
- "Wörter haben oft mehrere Bedeutungen. Einige kennen den "Kanal" als künstliche Wasserstraße, andere vom Fernsehen. Die Waage kann zum Erfassen des Gewichts nützlich sein oder zur Orientierung auf der Horoskopseite. Casablanca ist eine Stadt und ein Film zugleich. Wo Menschen mit der Zeit Bedeutungen unterscheiden und verarbeiten lernen, können dies Suchmaschinen von selbst nicht. Stets listen sie dumpf hintereinander weg alles auf, was sie zu einem Thema finden. Damit das nicht so bleibt, haben sich nun Google, Yahoo und die zu Microsoft gehörende Suchmaschine Bing zusammengetan, um der Suche im Netz mehr Verständnis zu verpassen. Man spricht dabei auch von einer "semantischen Suche". Das Ergebnis heißt Schema.org. Wer die Webseite einmal besucht, sich ein wenig in die Unterstrukturen hereinklickt und weder Vorkenntnisse im Programmieren noch im Bereich des semantischen Webs hat, wird sich überfordert und gelangweilt wieder abwenden. Doch was hier entstehen könnte, hat das Zeug dazu, Teile des Netzes und speziell die Funktionen von Suchmaschinen mittel- oder langfristig zu verändern. "Große Player sind dabei, sich auf Standards zu einigen", sagt Daniel Bahls, Spezialist für Semantische Technologien beim ZBW Leibniz-Informationszentrum Wirtschaft in Hamburg. "Die semantischen Technologien stehen schon seit Jahren im Raum und wurden bisher nur im kleineren Kontext verwendet." Denn Schema.org lädt Entwickler, Forscher, die Semantic-Web-Community und am Ende auch alle Betreiber von Websites dazu ein, an der Umgestaltung der Suche im Netz mitzuwirken. Inhalte von Websites sollen mit einem speziellen, aber einheitlichen Vokabular für die Crawler - die Analyseprogramme der Suchmaschinen - gekennzeichnet und aufbereitet werden.
Indem Schlagworte, sogenannte Tags, in den für Normal-User nicht sichtbaren Teil des Codes von Websites eingebettet werden, sind Suchmachinen nicht mehr so sehr auf die Analyse der natürlichen Sprache angewiesen, um Texte inhaltlich zu erfassen. Im Blog ZBW Mediatalk wird dies als "Semantic Web light" bezeichnet - ein semantisches Web auf niedrigster Ebene. Aber selbst das werde "schon viel bewirken", meint Bahls. "Das semantische Web wird sich über die nächsten Jahrzehnte evolutionär weiterentwickeln." Einen "Abschluss" werde es nie geben, "da eine einheitliche Formalisierung von Begrifflichkeiten auf feiner Stufe kaum möglich ist". Die Ergebnisse aus Schema.org würden "zeitnah" in die Suchmaschine integriert, "denn einen Zeitplan" gebe es nicht, so Stefan Keuchel, Pressesprecher von Google Deutschland. Bis das so weit ist, hilft der Verweis von Daniel Bahns auf die bereits existierende semantische Suchmaschine Sig.ma. Geschwindigkeit und Menge der Ergebnisse nach einer Suchanfrage spielen hier keine Rolle. Sig.ma sammelt seine Informationen allein im Bereich des semantischen Webs und listet nach einer Anfrage alles Bekannte strukturiert auf.
-
Godby, C.J.; Smith, D.; Childress, E.: Encoding application profiles in a computational model of the crosswalk (2008)
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- Abstract
- OCLC's Crosswalk Web Service (Godby, Smith and Childress, 2008) formalizes the notion of crosswalk, as defined in Gill,et al. (n.d.), by hiding technical details and permitting the semantic equivalences to emerge as the centerpiece. One outcome is that metadata experts, who are typically not programmers, can enter the translation logic into a spreadsheet that can be automatically converted into executable code. In this paper, we describe the implementation of the Dublin Core Terms application profile in the management of crosswalks involving MARC. A crosswalk that encodes an application profile extends the typical format with two columns: one that annotates the namespace to which an element belongs, and one that annotates a 'broader-narrower' relation between a pair of elements, such as Dublin Core coverage and Dublin Core Terms spatial. This information is sufficient to produce scripts written in OCLC's Semantic Equivalence Expression Language (or Seel), which are called from the Crosswalk Web Service to generate production-grade translations. With its focus on elements that can be mixed, matched, added, and redefined, the application profile (Heery and Patel, 2000) is a natural fit with the translation model of the Crosswalk Web Service, which attempts to achieve interoperability by mapping one pair of elements at a time.
- Source
- Metadata for semantic and social applications : proceedings of the International Conference on Dublin Core and Metadata Applications, Berlin, 22 - 26 September 2008, DC 2008: Berlin, Germany / ed. by Jane Greenberg and Wolfgang Klas
- Theme
- Semantische Interoperabilität
-
Bohne-Lang, A.: Semantische Metadaten für den Webauftritt einer Bibliothek (2016)
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- Abstract
- Das Semantic Web ist schon seit über 10 Jahren viel beachtet und hat mit der Verfügbarkeit von Resource Description Framework (RDF) und den entsprechenden Ontologien einen großen Sprung in die Praxis gemacht. Vertreter kleiner Bibliotheken und Bibliothekare mit geringer Technik-Affinität stehen aber im Alltag vor großen Hürden, z.B. bei der Frage, wie man diese Technik konkret in den eigenen Webauftritt einbinden kann: man kommt sich vor wie Don Quijote, der versucht die Windmühlen zu bezwingen. RDF mit seinen Ontologien ist fast unverständlich komplex für Nicht-Informatiker und somit für den praktischen Einsatz auf Bibliotheksseiten in der Breite nicht direkt zu gebrauchen. Mit Schema.org wurde ursprünglich von den drei größten Suchmaschinen der Welt Google, Bing und Yahoo eine einfach und effektive semantische Beschreibung von Entitäten entwickelt. Aktuell wird Schema.org durch Google, Microsoft, Yahoo und Yandex weiter gesponsert und von vielen weiteren Suchmaschinen verstanden. Vor diesem Hintergrund hat die Bibliothek der Medizinischen Fakultät Mannheim auf ihrer Homepage (http://www.umm.uni-heidelberg.de/bibl/) verschiedene maschinenlesbare semantische Metadaten eingebettet. Sehr interessant und zukunftsweisend ist die neueste Entwicklung von Schema.org, bei der man eine 'Library' (https://schema.org/Library) mit Öffnungszeiten und vielem mehr modellieren kann. Ferner haben wir noch semantische Metadaten im Open Graph- und Dublin Core-Format eingebettet, um alte Standards und Facebook-konforme Informationen maschinenlesbar zur Verfügung zu stellen.
- Theme
- Semantic Web
-
Heery, R.: Information gateways : collaboration and content (2000)
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- Abstract
- Information subject gateways provide targeted discovery services for their users, giving access to Web resources selected according to quality and subject coverage criteria. Information gateways recognise that they must collaborate on a wide range of issues relating to content to ensure continued success. This report is informed by discussion of content activities at the 1999 Imesh Workshop. The author considers the implications for subject based gateways of co-operation regarding coverage policy, creation of metadata, and provision of searching and browsing across services. Other possibilities for co-operation include working more closely with information providers, and diclosure of information in joint metadata registries
- Date
- 22. 6.2002 19:38:54
-
Liechti, O.; Sifer, M.J.; Ichikawa, T.: Structured graph format : XML metadata for describing Web site structure (1998)
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- Abstract
- To improve searching, filtering and processing of information on the Web, a common effort is made in the direction of metadata, defined as machine understandable information about Web resources or other things. In particular, the eXtensible Markup Language (XML) aims at providing a common syntax to emerging metadata formats. Proposes the Structured Graph Format (SGF) an XML compliant markup language based on structured graphs, for capturing Web sites' structure. Presents SGMapper, a client-site tool, which aims to facilitate navigation in large Web sites by generating highly interactive site maps using SGF metadata
- Date
- 1. 8.1996 22:08:06
- Footnote
- Contribution to a special issue devoted to the Proceedings of the 7th International World Wide Web Conference, held 14-18 April 1998, Brisbane, Australia
-
Méndez, E.; López, L.M.; Siches, A.; Bravo, A.G.: DCMF: DC & Microformats, a good marriage (2008)
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- Abstract
- This report introduces the Dublin Core Microformats (DCMF) project, a new way to use the DC element set within X/HTML. The DC microformats encode explicit semantic expressions in an X/HTML webpage, by using a specific list of terms for values of the attributes "rev" and "rel" for <a> and <link> elements, and "class" and "id" of other elements. Microformats can be easily processed by user agents and software, enabling a high level of interoperability. These characteristics are crucial for the growing number of social applications allowing users to participate in the Web 2.0 environment as information creators and consumers. This report reviews the origins of microformats; illustrates the coding of DC microformats using the Dublin Core Metadata Gen tool, and a Firefox extension for extraction and visualization; and discusses the benefits of creating Web services utilizing DC microformats.
- Source
- Metadata for semantic and social applications : proceedings of the International Conference on Dublin Core and Metadata Applications, Berlin, 22 - 26 September 2008, DC 2008: Berlin, Germany / ed. by Jane Greenberg and Wolfgang Klas
-
Heery, R.; Powell, A.; Day, M.: Metadata (1997)
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- Abstract
- Examines metadata within the context of network information management. Defines metadata, gives an overview of resource discovery service model in the context of the Web, and gives a simple typology of resource discovery metadata and the associated characteristics of metadata formats. Describes some of the projects and services, which are now using metadata for resource discovery in a networked environment. Covers: the Dublin Core, Web indexes, projects and services using metadata, associated technologies, and use of identifiers
-
Ilik, V.; Storlien, J.; Olivarez, J.: Metadata makeover (2014)
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- Abstract
- Catalogers have become fluent in information technology such as web design skills, HyperText Markup Language (HTML), Cascading Stylesheets (CSS), eXensible Markup Language (XML), and programming languages. The knowledge gained from learning information technology can be used to experiment with methods of transforming one metadata schema into another using various software solutions. This paper will discuss the use of eXtensible Stylesheet Language Transformations (XSLT) for repurposing, editing, and reformatting metadata. Catalogers have the requisite skills for working with any metadata schema, and if they are excluded from metadata work, libraries are wasting a valuable human resource.
- Date
- 10. 9.2000 17:38:22
- Source
- Library resources and technical services. 58(2014) no.3, S.187-208
-
Marchiori, M.: ¬The limits of Web metadata, and beyond (1998)
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- Abstract
- Highlights 2 major problems of the WWW metadata: it will take some time before a reasonable number of people start using metadata to provide a better Web classification, and that no one can guarantee that a majority of the Web objects will be ever properly classified via metadata. Addresses the problem of how to cope with intrinsic limits of Web metadata, proposes a method to solve these problems and show evidence of its effectiveness. Examines the important problem of what is the required critical mass in the WWW for metadata in order for it to be really useful
- Date
- 1. 8.1996 22:08:06
- Footnote
- Contribution to a special issue devoted to the Proceedings of the 7th International World Wide Web Conference, held 14-18 April 1998, Brisbane, Australia
-
Franklin, R.A.: Re-inventing subject access for the semantic web (2003)
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- Abstract
- First generation scholarly research on the Web lacked a firm system of authority control. Second generation Web research is beginning to model subject access with library science principles of bibliographic control and cataloguing. Harnessing the Web and organising the intellectual content with standards and controlled vocabulary provides precise search and retrieval capability, increasing relevance and efficient use of technology. Dublin Core metadata standards permit a full evaluation and cataloguing of Web resources appropriate to highly specific research needs and discovery. Current research points to a type of structure based on a system of faceted classification. This system allows the semantic and syntactic relationships to be defined. Controlled vocabulary, such as the Library of Congress Subject Headings, can be assigned, not in a hierarchical structure, but rather as descriptive facets of relating concepts. Web design features such as this are adding value to discovery and filtering out data that lack authority. The system design allows for scalability and extensibility, two technical features that are integral to future development of the digital library and resource discovery.
- Date
- 30.12.2008 18:22:46
- Theme
- Semantic Web
-
Hengel, C.: Normdaten und Metadaten : die Idee eines internationalen authority file (2003)
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- Abstract
- Normdaten sind Metadaten besonderer Oualität: Metadaten zu Metadaten. In einem getrennt vom Metadaten-Set zur einzelnen Publikation gebildeten Normdaten-Satz werden die unterschiedlichen in den Publikationen verwendeten Namensformen bzw. Bezeichnungen für dasselbe Objekt zusammengeführt und normiert. Durch die Verwendung von Normdaten als Metadaten wird kontrolliert und sichergestellt, dass z. B. für Autoren, Urheber, Verleger, Sachinhalte etc. gleich bleibende, identische Sucheinstiege und Zugriffspunkte gebildet werden (Authority Control). Für die Recherche wirkt sich die Normierung so aus, dass die zugehörigen Publikationen über alle im Normdatensatz beinhalteten Namensformen und Bezeichnungen gefunden werden können. Durch die Angabe von Attributen und Relationen zu den einzelnen Objekten werden zudem zusätzliche, vernetzte Zugriffspunkte bereitgestellt. Normdaten sind damit ideal zur Bildung von semantischen Navigationsnetzen für die Suche und den Zugriff auf Publikationen und andere Objekte geeignet. Das standardisierte Vokabular und das Nummernsystem einer Normdatei hat aber nur im eigenen Anwendungsbereich Gültigkeit, und die gemeinsame Nutzung von Titeldaten kann durch die Nutzung unterschiedlicher Normdateien behindert werden. Die IFLA-Arbeitsgruppe FRANAR hat mit der Vision eines gemeinsamen Virtuellen Authority File ein Modell entwickelt, wie im Bibliothekswesen Interoperabilität zwischen den nationalen Normdateien hergestellt werden kann. Um die Realisierbarkeit eines solchen Vorhabens nachzuweisen, haben die Library of Congress, OCLC und Die Deutsche Bibliothek ein gemeinsames Projekt vereinbart, in dem exemplarisch für den Bereich der Personennormdaten ein VIAF (Virtual International Authority File) aufgebaut werden soll.
-
Belém, F.M.; Almeida, J.M.; Gonçalves, M.A.: ¬A survey on tag recommendation methods : a review (2017)
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- Abstract
- Tags (keywords freely assigned by users to describe web content) have become highly popular on Web 2.0 applications, because of the strong stimuli and easiness for users to create and describe their own content. This increase in tag popularity has led to a vast literature on tag recommendation methods. These methods aim at assisting users in the tagging process, possibly increasing the quality of the generated tags and, consequently, improving the quality of the information retrieval (IR) services that rely on tags as data sources. Regardless of the numerous and diversified previous studies on tag recommendation, to our knowledge, no previous work has summarized and organized them into a single survey article. In this article, we propose a taxonomy for tag recommendation methods, classifying them according to the target of the recommendations, their objectives, exploited data sources, and underlying techniques. Moreover, we provide a critical overview of these methods, pointing out their advantages and disadvantages. Finally, we describe the main open challenges related to the field, such as tag ambiguity, cold start, and evaluation issues.
- Date
- 16.11.2017 13:30:22
-
Oehlschläger, S.: Abschlussworkshop des Projektes META-LIB und 1. Metadaten-Workshop der Arbeitsstelle für Standardisierung Der Deutschen Bibliothek : Metadaten - Alter Wein in neuen Schläuchen? (2003)
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- Abstract
- Die seit Mitte der goer Jahre des letzten Jahrhunderts durch das Internet und vor allem durch das World Wide Web (WWW) entstandenen neuen Kommunikations- und Publikationsmöglichkeiten stellen die mit der Sammlung, Erschließung und Nutzbarmachung von Veröffentlichungen beauftragten wissenschaftlichen Bibliotheken vor neue Herausforderungen. Netzpublikationen erfordern die Überprüfung und Anpassung bestehender Methoden und Geschäftsgänge. Neben den bibliothekarischen Verfahren haben sich im WWW neue Vorgehensweisen herausgebildet. Um die Suche, die Identifikation und den Zugriff auf Netzpublikationen zu unterstützen, werden strukturierte Daten beigegeben: Metadaten. Außer den zum Auffinden der Ressourcen notwendigen Metadaten spielen weitere Arten von Metadaten für Netzpublikationen eine zunehmend wichtige Rolle.
-
Bellotto, A.; Bekesi, J.: Enriching metadata for a university repository by modelling and infrastructure : a new vocabulary server for Phaidra (2019)
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- Abstract
- This paper illustrates an initial step towards the 'semantic enrichment' of University of Vienna's Phaidra repository as one of the valuable and up-to-date strategies able to enhance its role and usage. Firstly, a technical report points out the choice made in a local context, i.e. the deployment of the vocabulary server iQvoc instead of the formerly used SKOSMOS, explaining design decisions behind the current tool and additional features that the implementation required. Afterwards, some modelling characteristics of the local LOD controlled vocabulary are described according to SKOS documentation and best practices, highlighting which approaches can be pursued for rendering a LOD KOS available in the Web as well as issues that can be possibly encountered.
- Theme
- Semantische Interoperabilität
-
Wolfekuhler, M.R.; Punch, W.F.: Finding salient features for personal Web pages categories (1997)
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- Abstract
- Examines techniques that discover features in sets of pre-categorized documents, such that similar documents can be found on the WWW. Examines techniques which will classifiy training examples with high accuracy, then explains why this is not necessarily useful. Describes a method for extracting word clusters from the raw document features. Results show that the clustering technique is successful in discovering word groups in personal Web pages which can be used to find similar information on the WWW
- Date
- 1. 8.1996 22:08:06
- Footnote
- Contribution to a special issue of papers from the 6th International World Wide Web conference, held 7-11 Apr 1997, Santa Clara, California
-
Banush, D.; Kurth, M:; Pajerek, J.: Rehabilitating killer serials : an automated strategy for maintaining E-journal metadata (2005)
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- Abstract
- Cornell University Library (CUL) has developed a largely automated method for providing title-level catalog access to electronic journals made available through aggregator packages. CUL's technique for automated e-journal record creation and maintenance relies largely on the conversion of externally supplied metadata into streamlined, abbreviated-level MARC records. Unlike the Cooperative Online Serials Cataloging Program's recently implemented aggregator-neutral approach to e-journal cataloging, CUL's method involves the creation of a separate bibliographic record for each version of an e-journal title in order to facilitate automated record maintenance. An indexed local field indicates the aggregation to which each title belongs and enables machine manipulation of all the records associated with a specific aggregation. Information encoded in another locally defined field facilitates the identification of all of the library's e-journal titles and allows for the automatic generation of a Web-based title list of e-journals. CUL's approach to providing title-level catalog access to its e-journal aggregations involves a number of tradeoffs in which some elements of traditional bibliographic description (such as subject headings and linking fields) are sacrificed in the interest of timeliness and affordability. URLs (Uniform Resource Locators) and holdings information are updated on a regular basis by use of automated methods that save on staff costs.
- Date
- 10. 9.2000 17:38:22
- Source
- Library resources and technical services. 49(2005) no.3, S.190-203
-
Hsieh-Yee, I.: Cataloging and metatdata education in North American LIS programs (2004)
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- Abstract
- This paper presents findings of a survey an the state of cataloging and metadata education. in ALA-accredited library and information science progranis in North America. The survey was conducted in response to Action Item 5.1 of the "Bibliographic Control of Web Resources: A Library of Congress Action Plan," which focuses an providing metadata education to new LIS professionals. The study found LIS programs increased their reliance an introductory courses to cover cataloging and metadata, but fewer programs than before had a cataloging course requirement. The knowledge of cataloging delivered in introductory courses was basic, and the coverage of metadata was limited to an overview. Cataloging courses showed similarity in coverage and practice and focused an print mater!als. Few cataloging educators provided exercises in metadata record creation using non-AACR standards. Advanced cataloging courses provided in-depth coverage of subject cataloging and the cataloging of nonbook resources, but offered very limited coverage of metadata. Few programs offered full courses an metadata, and even fewer offered advanced metadata courses. Metadata topics were well integrated into LIS curricula, but coverage of metadata courses varied from program to program, depending an the interests of instructors. Educators were forward-looking and agreed an the inclusion of specific knowledge and skills in metadata instruction. A series of actions were proposed to assist educators in providing students with competencies in cataloging and metadata.
- Date
- 10. 9.2000 17:38:22
- Source
- Library resources and technical services. 48(2004) no.1, S.59-68
-
Aldana, J.F.; Gómez, A.C.; Moreno, N.; Nebro, A.J.; Roldán, M.M.: Metadata functionality for semantic Web integration (2003)
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- Abstract
- We propose an extension of a mediator architecture. This extension is oriented to ontology-driven data integration. In our architecture ontologies are not managed by an extemal component or service, but are integrated in the mediation layer. This approach implies rethinking the mediator design, but at the same time provides advantages from a database perspective. Some of these advantages include the application of optimization and evaluation techniques that use and combine information from all abstraction levels (physical schema, logical schema and semantic information defined by ontology). 1. Introduction Although the Web is probably the richest information repository in human history, users cannot specify what they want from it. Two major problems that arise in current search engines (Heflin, 2001) are: a) polysemy, when the same word is used with different meanings; b) synonymy, when two different words have the same meaning. Polysemy causes irrelevant information retrieval. On the other hand, synonymy produces lost of useful documents. The lack of a capability to understand the context of the words and the relationships among required terms, explains many of the lost and false results produced by search engines. The Semantic Web will bring structure to the meaningful content of Web pages, giving semantic relationships among terms and possibly avoiding the previous problems. Various proposals have appeared for meta-data representation and communication standards, and other services and tools that may eventually merge into the global Semantic Web (Berners-lee, 2001). Hopefully, in the next few years we will see the universal adoption of open standards for representation and sharing of meta-information. In this environment, software agents roaming from page to page can readily carry out sophisticated tasks for users (Berners-Lee, 2001). In this context, ontologies can be seen as metadata that represent semantic of data; providing a knowledge domain standard vocabulary, like DTDs and XML Schema do. If its pages were so structured, the Web could be seen as a heterogeneous collection of autonomous databases. This suggests that techniques developed in the Database area could be useful. Database research mainly deals with efficient storage and retrieval and with powerful query languages.
