By Grigoris Antoniou, Frank van Harmelen

ISBN-10: 0262012421

ISBN-13: 9780262012423

ISBN-10: 1435635221

ISBN-13: 9781435635227

The advance of the Semantic internet, with machine-readable content material, has the capability to revolutionize the area huge internet and its makes use of. A Semantic net Primer presents an advent and consultant to this nonetheless rising box, describing its key principles, languages, and applied sciences. compatible to be used as a textbook or for self-study by means of execs, it concentrates on undergraduate-level primary suggestions and methods that might allow readers to continue with development functions all alone and contains workouts, undertaking descriptions, and annotated references to suitable on-line fabrics. A Semantic internet Primer presents a scientific remedy of the several languages (XML, RDF, OWL, and principles) and applied sciences (explicit metadata, ontologies, and good judgment and inference) which are valuable to Semantic net improvement in addition to such the most important comparable issues as ontology engineering and alertness situations. This considerably revised and up to date moment variation displays fresh advancements within the box, masking new software parts and instruments. the recent fabric contains a dialogue of such themes as SPARQL because the RDF question language; OWL DLP and its fascinating functional and theoretical houses; the SWRL language (in the bankruptcy on rules); OWL-S (on which the dialogue of internet companies is now based). the recent ultimate bankruptcy considers the state-of-the-art of the sphere this present day, captures ongoing discussions, and descriptions the main not easy matters dealing with the Semantic net sooner or later. Supplementary fabrics, together with slides, on-line types of some of the code fragments within the e-book, and hyperlinks to additional examining, are available at

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In contrast, the second XML document uses completely different tags from the first XML document. This observation is related to the intended use of representations. HTML representations are intended to display information, so the set of tags is fixed: lists, bold, color, and so on. In XML we may use information in various ways, and it is up to the user to define a vocabulary suitable for the application. Therefore, XML is a metalanguage for markup: it does not have a fixed set of tags but allows users to define tags of their own.

IMPLIED. The appearance of the attribute is optional. In the example, comments are optional. 3 Structuring 37 • #FIXED "value". Every element must have this attribute, which has always the value given after #FIXED in the DTD. A value given in an XML document is meaningless because it is overridden by the fixed value. • "value". This specifies the default value for the attribute. If a specific value appears in the XML document, it overrides the default value. For example, the default encoding of the e-mail system may be “mime”, but “binhex” will be used if specified explicitly by the user.

Truszczynski”? Clearly, more text processing is needed to answer this question, processing that is open to errors. The problems arise from the fact that the HTML document does not contain structural information, that is, information about pieces of the document and their relationships. 1 Introduction 27 ily accessible to machines because every piece of information is described. Moreover, some forms of their relations are also defined through the nesting structure. For example, the tags appear within the tags, so they describe properties of the particular book.

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A Semantic Web Primer, by Grigoris Antoniou, Frank van Harmelen

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