Learn to represent complex knowledge from the pizza tutorial

One of our goals is to explain how to document complex knowledge using Description Logic and OWL — a language used to represent complex knowledge.

To make abstract concepts more accessible, we use a simple example: pizza.

The pizza example illustrates OWL principles without getting bogged down in technical details.

It is easy to take a pizza menu and ask people to extract information necessary to build a pizza ontology. It also is easy to talk about classifications of toppings.

Our pizza example focuses on OWL principles, such as open world reasoning and Boolean algebra, by using the familiar context of pizza toppings and bases.

Chapter 1

Building OWL ontologies; using query tools; defining logical and data integrity constraints.

Chapter 2

Navigating Protégé user interface and views.

Chapter 3

Describing domain-specific concepts and logical relationships using ontologies and OWL.

Learn about OWL

Chapter 4

Using familiar concepts to build a Pizza ontology in OWL.

Chapter 5

Comparing datatype properties in OWL, UML and E/R models.

Defining data and relationships

Chapter 6

Using transitive properties to define spiciness, like isSpicierThan and isMilderThan.

Making data explicit

Chapter 7

Defining OWL names, IRIs, labels, and namespaces for unique and organized ontologies.

Organizing data

Chapter 8

Explaining T-Box and A-Box information, and providing resources for pre-populated Pizza ontology data.

Managing large ontologies

Chapter 9

Using Description Logic and SPARQL to query an ontology.

Implementing data queries

Chapter 10

Defining rules and inferences using Semantic Web Rule Language (SWRL).

Making logical connections

Chapter 11

Shaping data using Shapes Constraint Language (SHACL ) for handling real-world, messy data.

Insuring data quality