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 5. Modeling Knowledge in the Real World
"Welcome to the real world"
—Morpheus, The Matrix
Most of the discussion so far about RDF, OWL, and ontologies has been very abstract. To this point, you've learned what they are, but not as much about how to use them in practical applications and how to utilize the information they enable you to model.
This chapter is about using OWL ontologies in the real world. In it, you learn about:
How ontologies fit into practical applications
The concept of inference and how it is critical to the implementation of the semantics of OWL
Profiles of OWL, their purposes, and how they can be used to provide desirable computational characteristics to systems using OWL
Critical design principles for information-management applications
Exploring the Components of the Semantic Web
OWL ontologies allow you to describe things using explicit semantics. In Chapter 4, we often said that the semantics of various OWL constructs imply other information. For example, a statement asserting that two classes are related using rdfs:subClassOf implies that all members of the subclass are also members of the superclass. Returning to the example in Chapter 4, Daisy is a member of the class ex:Canine because it is explicitly stated in the following RDF excerpt:
@prefix ex: <http://example.org/>. ex:Mammal rdf:type owl:Class. # Canine is a subclass of Mammal ex:Canine rdf:type owl:Class; rdfs:subClassOf ex:Mammal. # Daisy is implicitly a member of the class Mammal ex:Daisy rdf:type ...
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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.