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What references offer a good summary/tutorial for using RDF/OWL? There seem to be enough tools (Protege, Topbraid, Jena, etc.) that knowing the syntax of the markup languages is not necessary, but knowing the concepts is, of course, still critical.
I'm working through the w3c documents (particularly the RDF Primer) but I'd like to find other resources/techniques to use as well.
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RDF is also a vocabulary that along with the RDFS vocabulary provides a set of terms that can be used for creating general/abstract descriptions of resources. OWL is a vocabulary built with RDF and RDFS vocabularies that provide new terms for creating more detailed descriptions of resources.
RDF Schema (RDFS) is a language for writing ontologies. An ontology is a model of (a relevant part of) the world, listing the types of object, the relationships that connect them, and constraints on the ways that objects and relationships can be combined.
Although the RDF/XML format is still in use, other RDF serializations are now preferred by many RDF users, both because they are more human-friendly, and because some RDF graphs are not representable in RDF/XML due to restrictions on the syntax of XML QNames.
A very good introduction to the semantic web in comparison to object-oriented languages is this document from W3C: A Semantic Web Primer for Object-Oriented Software Developers. It helped me clarify a lot of things from the beginning.
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