Wireless Sensor Networks
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Cross-references ▶ Web 2.0/3.0 ▶ Web Services ▶ XML ▶ XML Schema
Synonyms World Wide Web consortium
Recommended Reading 1.
W3C. Available at: http://www.w3.org/
Definition W3C is an international consortium for development of World Wide Web protocols and guidelines to ensure long-term growth of the Web.
Key Points W3C was founded in 1994 by the inventor of the World Wide Web Tim Berners-Lee as a vendor-neutral forum for building consensus around Web technologies. The consortium consists of member organization and dedicated staff of technical experts. Membership is open to any organization or individual whose application is reviewed and approved by the W3C. Usually W3C members invest significant resources into the Web technologies. W3C fulfils its mission by creation of recommendations enjoying status of international standards. In the first 10 years of existence, it produced over eighty W3C recommendations. W3C is responsible for such technologies as HTML, XHTML, XML, XML Schema, CSS, SOAP, WSDL and others. W3C members play a leading role in the development of the recommendations. W3C initiatives involve international, national, and regional organizations on global scale. Global participation reflects broad adoption of the web technologies. Along with broad adoption comes growth in diversity of software and hardware used on the Web. W3C aims to facilitate hardware and software interoperability to avoid fragmentation of the Web. W3C operations are jointly administered by the MIT Computer Science and Artificial Intelligence Laboratory, European Research Consortium for Informatics and Mathematics, and Keio University. #
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W3C XML Path Language ▶ XPath/XQuery
W3C XML Query Language ▶ XPath/XQuery
W3C XML Schema ▶ XML Schema
WAN Data Replication M AARTEN VAN S TEEN VU University, Amsterdam, The Netherlands
Synonyms Wide-area data replication
Definition The field of WAN data replication covers the problems and solutions for distributing and replicating data across wide-area networks. Concentrating on databases alone, a wide-area database is defined as a collection of multiple, logically interrelated databases distributed and
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WAN Data Replication
possibly replicated across sites that are connected through a wide-area network. The characteristic feature is that data are spread across sites that are separated through wide-area links. Unlike links in local-area networks, the quality of communication through wide-area links is relatively poor. Links are subject to latencies of tens to thousands of milliseconds, there are often severe bandwidth restrictions, and connections between sites are much less reliable. In principle, WAN data replication also covers the distribution and replication of plain files. These issues are traditionally handled by wide-area distributed file systems such as AFS [11] and NFS [3,12], which are both widely used. These distributed file systems aim at shielding data distribution from applications, i.e., they aim at providing a high degre
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