By Grigoris Antoniou, Frank van van Harmelen

The advance of the Semantic net, with machine-readable content material, has the aptitude to revolutionize the realm large net and its use. A Semantic internet Primer presents an creation and consultant to this rising box, describing its key principles, languages, and applied sciences. appropriate to be used as a textbook or for self-study through pros, it concentrates on undergraduate-level basic suggestions and strategies that would allow readers to continue with development purposes all alone. It comprises routines, undertaking descriptions, and annotated references to suitable on-line fabrics. A Semantic net Primer is the one to be had ebook at the Semantic internet to incorporate a scientific therapy of different languages (XML, RDF, OWL, and principles) and applied sciences (explicit metadata, ontologies, and common sense and inference) which are imperative to Semantic internet improvement. The e-book additionally examines such an important comparable issues as ontology engineering and alertness situations. After an introductory bankruptcy, issues coated in succeeding chapters contain XML and similar applied sciences that aid semantic interoperability; RDF and RDF Schema, the traditional facts version for machine-processable semantics; and OWL, the W3C-approved usual for an internet ontology language extra large than RDF Schema; ideas, either monotonic and nonmonotonic, within the framework of the Semantic internet; chosen program domain names and the way the Semantic internet would receive advantages them; the advance of ontology-based structures; and present debates on key concerns and predictions for the long run.

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Lieberman and W. Wahlster, eds. Spinning the Semantic Web. Cambridge, MA: MIT Press, 2003. • J. Davies, D. Fensel and F. van Harmelen, eds. Towards the Semantic Web: Ontology-Driven Knowledge Management. New York: Wiley, 2002. org/>). 1 Structured Web Documents in XML Introduction Today HTML (hypertext markup language) is the standard language in which Web pages are written. HTML, in turn, was derived from SGML (standard generalized markup language), an international standard (ISO 8879) for the definition of device- and system-independent methods of representing information, both human- and machine-readable.

Of course, we must admit that the HTML representation provides more than the XML representation: the formatting of the document is also described. However, this feature is not a strength but a weakness of HTML: it must specify the formatting; in fact, the main use of an HTML document is to display information (apart from linking to other documents). On the other hand, XML separates content from formatting. The same information can be displayed in different ways, without requiring multiple copies of the same content; moreover, the content may be used for purposes other than display.

There are no cycles. • Each node, other than the root, has exactly one parent. • Each node has a label. • The order of elements is important. However, whereas the order of elements is important, the order of attributes is not. So, the following two elements are equivalent: This aspect is not represented properly in the tree. ). de Where is your draft? Grigoris, where is the draft of the paper you promised me last week?

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