Download A Semantic Web Primer (Cooperative Information Systems) by Grigoris Antoniou, Frank van van Harmelen PDF

By Grigoris Antoniou, Frank van van Harmelen

The improvement of the Semantic net, with machine-readable content material, has the aptitude to revolutionize the area broad net and its use. A Semantic net Primer offers an creation and advisor to this rising box, describing its key principles, languages, and applied sciences. compatible to be used as a textbook or for self-study through pros, it concentrates on undergraduate-level basic innovations and methods that may let readers to continue with development purposes all alone. It contains routines, undertaking descriptions, and annotated references to proper on-line fabrics. A Semantic net Primer is the single to be had publication at the Semantic internet to incorporate a scientific therapy of the various languages (XML, RDF, OWL, and ideas) and applied sciences (explicit metadata, ontologies, and good judgment and inference) which are relevant to Semantic net improvement. The e-book additionally examines such the most important comparable issues as ontology engineering and alertness situations. After an introductory bankruptcy, issues coated in succeeding chapters comprise XML and similar applied sciences that aid semantic interoperability; RDF and RDF Schema, the traditional information version for machine-processable semantics; and OWL, the W3C-approved usual for an internet ontology language extra broad than RDF Schema; ideas, either monotonic and nonmonotonic, within the framework of the Semantic internet; chosen program domain names and the way the Semantic net would get advantages them; the improvement of ontology-based structures; and present debates on key matters and predictions for the long run.

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It should be noted that XML can serve as a uniform data exchange format between applications. In fact, XML’s use as a data exchange format between applications nowadays far outstrips its originally intended use as document markup language. Companies often need to retrieve information from their customers and business partners, and update their corporate databases accordingly. If there is not an agreed common standard like XML, then specialized processing and querying software must be developed for each partner separately, leading to technical overhead; moreover, the software must be updated every time a partner decides to change its own database format.

An additional advantage is that XML allows the definition of constraints on values (for example, that a year must be a number of four digits, that the number must be less than 3,000). XML allows the representation of information that is also machine-accessible. 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).

Tags may not overlap, as in Lee Hong. • Attributes within an element have unique names. • Element and tag names must be permissible. 7 Structured Web Documents in XML The Tree Model of XML Documents It is possible to represent well-formed XML documents as trees; thus trees provide a formal data model for XML. This representation is often instructive. Grigoris, where is the draft of the paper you promised me last week? 1 shows the tree representation of this XML document.

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