RDFS
We have looked at RDF, and the way in which it provides a vocabulary to express knowledge, which allows us to create a knowledge base (a collection of RDF documents that are linked together by their namespaces). The RDF Schema (RDFS) provides structure to this knowledge, allowing us to describe the relationships between data.
There are two main uses for RDFS:
- To define classes and class hierarchies
- To define properties and type restrictions
We can use one RDFS document to define classes and indicate their relationships. In another document, we can then define properties and state that they are to be used with the class.