References and Links
- Be sure to read Tim Berners-Lee’s Scientific American article on the semantic web.
- SemanticWeb.org is a useful community portal.
- If you’re building a web and thinking of adding semantic information, "Cool URIs Don’t Change" is a must-read.
Getting started with RDF:
- Check out Tim Bray’s commentary, "What Is RDF?"
- For details on RDFS, see the RDF Schema W3C Recommendation.
- RDF became a W3C Recommendation in February 1999. Since that time, a number of tools have been created. For an in-depth treatment of these tools, consult the W3C’s RDF home page. Additional RDF information is available at Dave Beckett’s RDF Resource Guide.
- The Dublin Core is one standard for a set of descriptors (such as the title, publisher, subjects, and so on) that are used to catalog a wide range of networked resources. It’s a good place to see what others are doing with respect to metadata.
- Definitely, read Tom Gruber’s article, "What Is an Ontology?"
- The W3C has the definitive OWL Ontology Language Guide.
- Interested in more history? OWL developed as a follow-on from RDF and RDFS, as well as earlier ontology language projects including OIL, DAML, and DAML+OIL.
- When we start talking about logic and inference, we run into Kurt Gödel’s Incompleteness Theorem, which shattered belief in the all-encompassing power of mathematics by proving that an axiomatic system could not both be consistent and uncover all truths at the same time. Gödel’s theorem puts limits on what we can expect from logical deductive systems, but it doesn’t stop folks from trying.