November 2005
Intermediate to advanced
304 pages
6h 14m
English
Content preview from Wicked Cool Java
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Who's a What? Using RDF Hierarchies in Jena
Earlier we created a hierarchy of terms to use for our metadata. We used the word vocabulary to refer to this collection of terms, but it is often called an ontology if it defines relationships between the terms. According to the Wikipedia definition, an ontology (in the computer science sense) is a "data structure containing all the relevant entities and their relationships and rules (theorems, regulations) within a domain."
In Jena, there are built-in helper classes for working with commonly used ontologies . The RDF schema is one of these. Jena has a helper class called RDFS, which has a static ...
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