April 2009
Intermediate to advanced
646 pages
15h 30m
English
book
Semantic Web Programming
by John Hebeler, Matthew Fisher, Ryan Blace, Andrew Perez-Lopez, Mike Dean
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Chapter 4. Incorporating Semantics
"Whatever we learn has a purpose and whatever we do affects everything and everyone else, if even in the tiniest way. Why, when a housefly flaps his wings, a breeze goes round the world; when a speck of dust falls to the ground, the entire planet weighs a little more; and when you stamp your foot, the earth moves slightly off its course... And it's much the same thing with knowledge, for whenever you learn something new, the whole world becomes that much richer."
—Norton Juster, The Phantom Tollbooth
In the previous chapter, you learned about the information model of the Semantic Web: the Resource Description Framework, or RDF. RDF provides a virtually limitless model for describing information. You can say anything you want about anything you want. The drawback of all the flexibility and expressiveness of RDF is that used alone, it lacks explicit support for specifying the meaning, or semantics, behind the descriptions.
Fortunately, the original vision for the Semantic Web considered the fact that developers and users need some way of specifying rich semantic descriptions of concepts and relationships to exchange information effectively. RDF Schema (RDFS) and the OWL Web Ontology Language provide these capabilities.
The purpose of this chapter is to provide you with the knowledge necessary to add semantics to your web of RDF data. Semantics are the key to incorporating domain knowledge into RDF data, making the descriptions richer and more meaningful. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.