-
Christophides, V.; Plexousakis, D.; Scholl, M.; Tourtounis, S.: On labeling schemes for the Semantic Web (2003)
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- Abstract
- This paper focuses on the optimization of the navigation through voluminous subsumption hierarchies of topics employed by Portal Catalogs like Netscape Open Directory (ODP). We advocate for the use of labeling schemes for modeling these hierarchies in order to efficiently answer queries such as subsumption check, descendants, ancestors or nearest common ancestor, which usually require costly transitive closure computations. We first give a qualitative comparison of three main families of schemes, namely bit vector, prefix and interval based schemes. We then show that two labeling schemes are good candidates for an efficient implementation of label querying using standard relational DBMS, namely, the Dewey Prefix scheme [6] and an Interval scheme by Agrawal, Borgida and Jagadish [1]. We compare their storage and query evaluation performance for the 16 ODP hierarchies using the PostgreSQL engine.
-
as: XML: Extensible Markup Language : I: Was ist XML? (2001)
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- Date
- 30. 3.2003 11:06:22
-
Miller, E.; Schloss. B.; Lassila, O.; Swick, R.R.: Resource Description Framework (RDF) : model and syntax (1997)
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- Abstract
- RDF - the Resource Description Framework - is a foundation for processing metadata; it provides interoperability between applications that exchange machine-understandable information on the Web. RDF emphasizes facilities to enable automated processing of Web resources. RDF metadata can be used in a variety of application areas; for example: in resource discovery to provide better search engine capabilities; in cataloging for describing the content and content relationships available at a particular Web site, page, or digital library; by intelligent software agents to facilitate knowledge sharing and exchange; in content rating; in describing collections of pages that represent a single logical "document"; for describing intellectual property rights of Web pages, and in many others. RDF with digital signatures will be key to building the "Web of Trust" for electronic commerce, collaboration, and other applications. Metadata is "data about data" or specifically in the context of RDF "data describing web resources." The distinction between "data" and "metadata" is not an absolute one; it is a distinction created primarily by a particular application. Many times the same resource will be interpreted in both ways simultaneously. RDF encourages this view by using XML as the encoding syntax for the metadata. The resources being described by RDF are, in general, anything that can be named via a URI. The broad goal of RDF is to define a mechanism for describing resources that makes no assumptions about a particular application domain, nor defines the semantics of any application domain. The definition of the mechanism should be domain neutral, yet the mechanism should be suitable for describing information about any domain. This document introduces a model for representing RDF metadata and one syntax for expressing and transporting this metadata in a manner that maximizes the interoperability of independently developed web servers and clients. The syntax described in this document is best considered as a "serialization syntax" for the underlying RDF representation model. The serialization syntax is XML, XML being the W3C's work-in-progress to define a richer Web syntax for a variety of applications. RDF and XML are complementary; there will be alternate ways to represent the same RDF data model, some more suitable for direct human authoring. Future work may lead to including such alternatives in this document.
-
Schröder, A.: Web der Zukunft : RDF - Der erste Schritt zum semantischen Web
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- Abstract
- Seit dem 22. Februar 1999 ist das Resource Description Framework (RDF) als W3C-Empfehlung verfügbar. Doch was steckt hinter diesem Standard, der das Zeitalter des Semantischen Webs einläuten soll? Was RDF bedeutet, wozu man es einsetzt, welche Vorteile es gegenüber XML hat und wie man RDF anwendet, soll in diesem Artikel erläutert werden.
-
XML in libraries (2002)
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- Footnote
- Rez. in: JASIST 55(2004) no.14, S.1304-1305 (Z. Holbrooks):"The eXtensible Markup Language (XML) and its family of enabling technologies (XPath, XPointer, XLink, XSLT, et al.) were the new "new thing" only a couple of years ago. Happily, XML is now a W3C standard, and its enabling technologies are rapidly proliferating and maturing. Together, they are changing the way data is handled an the Web, how legacy data is accessed and leveraged in corporate archives, and offering the Semantic Web community a powerful toolset. Library and information professionals need a basic understanding of what XML is, and what its impacts will be an the library community as content vendors and publishers convert to the new standards. Norman Desmarais aims to provide librarians with an overview of XML and some potential library applications. The ABCs of XML contains the useful basic information that most general XML works cover. It is addressed to librarians, as evidenced by the occasional reference to periodical vendors, MARC, and OPACs. However, librarians without SGML, HTML, database, or programming experience may find the work daunting. The snippets of code-most incomplete and unattended by screenshots to illustrate the result of the code's execution-obscure more often than they enlighten. A single code sample (p. 91, a book purchase order) is immediately recognizable and sensible. There are no figures, illustrations, or screenshots. Subsection headings are used conservatively. Readers are confronted with page after page of unbroken technical text, and occasionally oddly formatted text (in some of the code samples). The author concentrates an commercial products and projects. Library and agency initiatives-for example, the National Institutes of Health HL-7 and U.S. Department of Education's GEM project-are notable for their absence. The Library of Congress USMARC to SGML effort is discussed in chapter 1, which covers the relationship of XML to its parent SGML, the XML processor, and data type definitions, using MARC as its illustrative example. Chapter 3 addresses the stylesheet options for XML, including DSSSL, CSS, and XSL. The Document Style Semantics and Specification Language (DSSSL) was created for use with SGML, and pruned into DSSSL-Lite and further (DSSSL-online). Cascading Style Sheets (CSS) were created for use with HTML. Extensible Style Language (XSL) is a further revision (and extension) of DSSSL-o specifically for use with XML. Discussion of aural stylesheets and Synchronized Multimedia Integration Language (SMIL) round out the chapter.
-
Learning XML (2003)
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- Footnote
- Rez. in: JASIST 55(2004) no.14, S.1304-1305 (Z. Holbrooks):"The eXtensible Markup Language (XML) and its family of enabling technologies (XPath, XPointer, XLink, XSLT, et al.) were the new "new thing" only a couple of years ago. Happily, XML is now a W3C standard, and its enabling technologies are rapidly proliferating and maturing. Together, they are changing the way data is handled an the Web, how legacy data is accessed and leveraged in corporate archives, and offering the Semantic Web community a powerful toolset. Library and information professionals need a basic understanding of what XML is, and what its impacts will be an the library community as content vendors and publishers convert to the new standards. Norman Desmarais aims to provide librarians with an overview of XML and some potential library applications. The ABCs of XML contains the useful basic information that most general XML works cover. It is addressed to librarians, as evidenced by the occasional reference to periodical vendors, MARC, and OPACs. However, librarians without SGML, HTML, database, or programming experience may find the work daunting. The snippets of code-most incomplete and unattended by screenshots to illustrate the result of the code's execution-obscure more often than they enlighten. A single code sample (p. 91, a book purchase order) is immediately recognizable and sensible. There are no figures, illustrations, or screenshots. Subsection headings are used conservatively. Readers are confronted with page after page of unbroken technical text, and occasionally oddly formatted text (in some of the code samples). The author concentrates an commercial products and projects. Library and agency initiatives-for example, the National Institutes of Health HL-7 and U.S. Department of Education's GEM project-are notable for their absence. The Library of Congress USMARC to SGML effort is discussed in chapter 1, which covers the relationship of XML to its parent SGML, the XML processor, and data type definitions, using MARC as its illustrative example. Chapter 3 addresses the stylesheet options for XML, including DSSSL, CSS, and XSL. The Document Style Semantics and Specification Language (DSSSL) was created for use with SGML, and pruned into DSSSL-Lite and further (DSSSL-online). Cascading Style Sheets (CSS) were created for use with HTML. Extensible Style Language (XSL) is a further revision (and extension) of DSSSL-o specifically for use with XML. Discussion of aural stylesheets and Synchronized Multimedia Integration Language (SMIL) round out the chapter.
-
¬The ABCs of XML : the librarian's guide to the eXtensible Markup Language (2000)
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- Footnote
- Rez. in: JASIST 55(2004) no.14, S.1304-1305 (Z. Holbrooks):"The eXtensible Markup Language (XML) and its family of enabling technologies (XPath, XPointer, XLink, XSLT, et al.) were the new "new thing" only a couple of years ago. Happily, XML is now a W3C standard, and its enabling technologies are rapidly proliferating and maturing. Together, they are changing the way data is handled an the Web, how legacy data is accessed and leveraged in corporate archives, and offering the Semantic Web community a powerful toolset. Library and information professionals need a basic understanding of what XML is, and what its impacts will be an the library community as content vendors and publishers convert to the new standards. Norman Desmarais aims to provide librarians with an overview of XML and some potential library applications. The ABCs of XML contains the useful basic information that most general XML works cover. It is addressed to librarians, as evidenced by the occasional reference to periodical vendors, MARC, and OPACs. However, librarians without SGML, HTML, database, or programming experience may find the work daunting. The snippets of code-most incomplete and unattended by screenshots to illustrate the result of the code's execution-obscure more often than they enlighten. A single code sample (p. 91, a book purchase order) is immediately recognizable and sensible. There are no figures, illustrations, or screenshots. Subsection headings are used conservatively. Readers are confronted with page after page of unbroken technical text, and occasionally oddly formatted text (in some of the code samples). The author concentrates an commercial products and projects. Library and agency initiatives-for example, the National Institutes of Health HL-7 and U.S. Department of Education's GEM project-are notable for their absence. The Library of Congress USMARC to SGML effort is discussed in chapter 1, which covers the relationship of XML to its parent SGML, the XML processor, and data type definitions, using MARC as its illustrative example. Chapter 3 addresses the stylesheet options for XML, including DSSSL, CSS, and XSL. The Document Style Semantics and Specification Language (DSSSL) was created for use with SGML, and pruned into DSSSL-Lite and further (DSSSL-online). Cascading Style Sheets (CSS) were created for use with HTML. Extensible Style Language (XSL) is a further revision (and extension) of DSSSL-o specifically for use with XML. Discussion of aural stylesheets and Synchronized Multimedia Integration Language (SMIL) round out the chapter.
-
Patrick, D.A.: XML in der Praxis : Unternehmensübergreifende Vorteile durch Enterprise Content Management (1999)
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- Date
- 30. 3.2003 10:50:22
-
Trotman, A.: Searching structured documents (2004)
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- Date
- 14. 8.2004 10:39:22
-
Ioannides, D.: XML schema languages : beyond DTD (2000)
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- Date
- 28. 1.2006 19:01:22
-
Vonhoegen, H.: Einstieg in XML (2002)
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- Footnote
- Rez. in: XML Magazin und Web Services 2003, H.1, S.14 (S. Meyen): "Seit dem 22. Februar 1999 ist das Resource Description Framework (RDF) als W3C-Empfehlung verfügbar. Doch was steckt hinter diesem Standard, der das Zeitalter des Semantischen Webs einläuten soll? Was RDF bedeutet, wozu man es einsetzt, welche Vorteile es gegenüber XML hat und wie man RDF anwendet, soll in diesem Artikel erläutert werden. Schlägt man das Buch auf und beginnt, im EinleitungsKapitel zu schmökern, fällt sogleich ins Auge, dass der Leser nicht mit Lektionen im Stile von "bei XML sind die spitzen Klammern ganz wichtig" belehrt wird, obgleich es sich um ein Buch für Anfänger handelt. Im Gegenteil: Es geht gleich zur Sache und eine gesunde Mischung an Vorkenntnissen wird vorausgesetzt. Wer sich heute für XML interessiert, der hat ja mit 99-prozentiger Wahrscheinlichkeit schon seine einschlägigen Erfahrungen mit HTML und dem Web gemacht und ist kein Newbie in dem Reich der spitzen Klammern und der (einigermaßen) wohlformatierten Dokumente. Und hier liegt eine deutliche Stärke des Werkes Helmut Vonhoegens, der seinen Einsteiger-Leser recht gut einzuschätzen weiß und ihn daher praxisnah und verständlich ans Thema heranführt. Das dritte Kapitel beschäftigt sich mit der Document Type Definition (DTD) und beschreibt deren Einsatzziele und Verwendungsweisen. Doch betont der Autor hier unablässig die Begrenztheit dieses Ansatzes, welche den Ruf nach einem neuen Konzept deutlich macht: XML Schema, welches er im folgenden Kapitel darstellt. Ein recht ausführliches Kapitel widmet sich dann dem relativ aktuellen XML Schema-Konzept und erläutert dessen Vorzüge gegenüber der DTD (Modellierung komplexer Datenstrukturen, Unterstützung zahlreicher Datentypen, Zeichenbegrenzungen u.v.m.). XML Schema legt, so erfährt der Leser, wie die alte DTD, das Vokabular und die zulässige Grammatik eines XML-Dokuments fest, ist aber seinerseits ebenfalls ein XML-Dokument und kann (bzw. sollte) wie jedes andere XML auf Wohlgeformtheit überprüft werden. Weitere Kapitel behandeln die Navigations-Standards XPath, XLink und XPointer, Transformationen mit XSLT und XSL und natürlich die XML-Programmierschnittstellen DOM und SAX. Dabei kommen verschiedene Implementierungen zum Einsatz und erfreulicherweise werden Microsoft-Ansätze auf der einen und Java/Apache-Projekte auf der anderen Seite in ungefähr vergleichbarem Umfang vorgestellt. Im letzten Kapitel schließlich behandelt Vonhoegen die obligatorischen Web Services ("Webdienste") als Anwendungsfall von XML und demonstriert ein kleines C#- und ASP-basiertes Beispiel (das Java-Äquivalent mit Apache Axis fehlt leider). "Einstieg in XML" präsentiert seinen Stoff in klar verständlicher Form und versteht es, seine Leser auf einem guten Niveau "abzuholen". Es bietet einen guten Überblick über die Grundlagen von XML und kann - zumindest derzeit noch - mit recht hoher Aktualität aufwarten."
-
Anderson, R.; Birbeck, M.; Kay, M.; Livingstone, S.; Loesgen, B.; Martin, D.; Mohr, S.; Ozu, N.; Peat, B.; Pinnock, J.; Stark, P.; Williams, K.: XML professionell : behandelt W3C DOM, SAX, CSS, XSLT, DTDs, XML Schemas, XLink, XPointer, XPath, E-Commerce, BizTalk, B2B, SOAP, WAP, WML (2000)
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- Date
- 22. 6.2005 15:12:11
