Download Explorer's Guide to the Semantic Web by Thomas B Passin PDF

By Thomas B Passin

As a structures engineer at a nonprofit company in Reston, Virginia, Passin grew to become serious about graphical how you can symbolize formal common sense statements in normal language and their relevance to the internet. He defines the semantic internet as an built-in suggestion of the way desktops, people, and the internet can interact; and introduces structures for representing information and metadata (e.g. subject maps), and the way they relate to net searches. those ideas are utilized in circumstances reports. dispensed within the US and Canada by means of self sufficient Publishers workforce.

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This approach has been wildly successful when the information is intended for people to read. With XML, you can describe the structure of the information in other ways, not just in terms of generic document units. You can choose the kind of structure that’s most suitable for the particular information and anticipated use. Thus, XML is seen as the foundation layer of the Semantic Web. The XML Schema layer provides the ability to specify structures and data types to be used by a particular XML document.

See chapter 3. TEAM LinG - Live, Informative, Non-cost and Genuine! Introducing RDF 25 The URI in question isn’t required to point to a document. The fact that it does is useful (in this case, the fragment identifier, or "#Statement", would cause the bold-faced portion to be displayed in a browser that understands XML). 3 Anonymous resources RDF doesn’t require that every resource in a statement be identified with a URI reference. ” As you’ll see, it would be awkward to model complex data sets with RDF ’s simple triples without the use of anonymous resources, because we’d be forced to invent unnecessary identifiers for them.

The facts in any well-designed set of tables can be rewritten in the form of RDF triples. We’d like to convert the primary key into a URI reference, in order for it to identify the subject in the RDF manner, although in some cases it might be feasible to use anonymous nodes to represent the rows. If this is the case—if RDF and relational tables are in some sense equivalent— then why bother with RDF? The database will probably have better performance if the data is perfectly regular, but with RDF, the data doesn’t have to be regular.

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