By Grigoris Antoniou, Frank van Harmelen
The improvement of the Semantic internet, with machine-readable content material, has the capability to revolutionize the realm vast internet and its makes use of. A Semantic internet Primer presents an creation and consultant to this nonetheless rising box, describing its key principles, languages, and applied sciences. appropriate to be used as a textbook or for self-study through execs, it concentrates on undergraduate-level primary innovations and methods that may allow readers to continue with development purposes all alone and contains workouts, venture descriptions, and annotated references to suitable on-line fabrics. A Semantic net Primer presents a scientific remedy of different languages (XML, RDF, OWL, and principles) and applied sciences (explicit metadata, ontologies, and good judgment and inference) which are relevant to Semantic internet improvement in addition to such the most important comparable subject matters as ontology engineering and alertness situations. This considerably revised and up-to-date moment version displays contemporary advancements within the box, masking new software components and instruments. the recent fabric contains a dialogue of such subject matters as SPARQL because the RDF question language; OWL DLP and its attention-grabbing sensible and theoretical houses; the SWRL language (in the bankruptcy on rules); OWL-S (on which the dialogue of net companies is now based). the recent ultimate bankruptcy considers the cutting-edge of the sector this day, captures ongoing discussions, and descriptions the main difficult matters dealing with the Semantic internet sooner or later. Supplementary fabrics, together with slides, on-line types of a few of the code fragments within the booklet, and hyperlinks to additional interpreting, are available at www.semanticwebprimer.org.
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Additional resources for A Semantic Web Primer,
A typical use of internal entities, and the one used in subsequent chapters of this book, is similar to constants in a programming language. For example, suppose that a document has several copyright notices that refer to the current year. ENTITY thisyear "2007"> Then, at each place the current year needs to be included, we can use the entity reference &thisyear; instead. That way, updating the year value to “2008” for the whole document will only mean changing the entity declaration. 3 Structuring 39 encoding (mime|binhex) "mime" file CDATA #REQUIRED> We go through some interesting parts of this DTD: • A head element contains a from element, at least one to element, zero or more cc elements, and a subject element, in that order.
6 Well-Formed XML Documents An XML document is well-formed if it is syntactically correct. The following are some syntactic rules: • There is only one outermost element in the document (called the root element). • Each element contains an opening and a corresponding closing tag. • Tags may not overlap, as in
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. Let us now consider another example, a famous law of physics.
A Semantic Web Primer, by Grigoris Antoniou, Frank van Harmelen