Java World

Peek inside a Java book that presents 101 exciting and cool code bits, open source projects, and project ideas

Chapter 3 is an exciting chapter to read, but Chapter 4′s discussion on crawling the Semantic Web is just awesome. The Semantic Web is a step up from the current Web in that the Semantic Web links concepts to concepts, not hypertext documents to other hypertext documents, via keywords. After introducing you to the Semantic Web, the Resource Description Framework (RDF) for specifying exactly how to relate entities to each other, and RDF Site Summary (RSS) feeds for appropriately tagging documents and syndicating their content, this chapter introduces the open source projects N3 and Jena. N3 is a notation for representing relationships and Jena is an API for working with RDF graphs and converting them to N3 and other kinds of documents.

Chapter 4 also introduces you to Lojban, an artificial spoken and written language based on predicate logic, and shows you how it fits with RDF; introduces Brian’s Jorne project that defines standards for combining Lojban with the Semantic Web; and introduces Informa for publishing, aggregating, polling, and filtering RSS feeds.

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