Search (3 results, page 1 of 1)

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Abstract

A subject gateway, in the context of network-based resource access, can be defined as some facility that allows easier access to network-based resources in a defined subject area. The simplest types of subject gateways are sets of Web pages containing lists of links to resources. Some gateways index their lists of links and provide a simple search facility. More advanced gateways offer a much enhanced service via a system consisting of a resource database and various indexes, which can be searched and/or browsed through a Web-based interface. Each entry in the database contains information about a network-based resource, such as a Web page, Web site, mailing list or document. Entries are usually created by a cataloguer manually identifying a suitable resource, describing the resource using a template, and submitting the template to the database for indexing. Subject gateways are also known as subject-based information gateways (SBIGs), subject-based gateways, subject index gateways, virtual libraries, clearing houses, subject trees, pathfinders and other variations thereof. This paper describes the characteristics of some of the subject gateways currently accessible through the Web, and compares them to automatic "vacuum cleaner" type search engines, such as AltaVista. The application of WHOIS++, centroids, query routing, and forward knowledge to searching several of these subject gateways simultaneously is outlined. The paper concludes with looking at some of the issues facing subject gateway development in the near future. The paper touches on many of the issues mentioned in a previous paper in D-Lib Magazine, especially regarding resource-discovery related initiatives and services.

Theme

Information Gateway

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Abstract

This article introduces the Friend of a Friend (FOAF) vocabulary specification as an example of a Semantic Web technology. A real world case study is presented in which FOAF is used to solve some specific problems of identity management. The main goal is to provide some basic theory behind the Semantic Web and then attempt to ground that theory in a practical solution.

Footnote

Simultaneously published as Knitting the Semantic Web

Theme

Semantic Web

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Abstract

This talk focuses on the relationship between subject classification and 'Web of data' trends around RDF, OWL and SKOS. In particular it sketches ways in which factual and ontological data can be used alongside subject classification and on the practical possibilities this creates for collaboration amongst vocabulary and dataset maintainers, and in user-facing applications. Although factual ontologies and subject classification systems typically serve different purposes, they often overlap in topical coverage and are can all be expressed using shared underlying 'Web of data' technologies, such as RDF. With each passing week, new datasets-whether scientific, library, cultural heritage, governmental or social-are published as 'linked data', with ROE vocabularies, OWL ontologies and SKOS schemes as the representational 'glue' that holds the whole thing together. Factual representations of people, places and things serve as bridges between the subject classification world and the world of general Web data. Despite this, we have not yet collectively produced 'best practice' guidance that show how such linkage can be created, curated and exploited using practical, modern Web tools. A goal of this talk is to motivate such collaboration, and to suggest some priorities for the short and medium term.