Generics allow parameters to determine the type of the return value. This can be used to avoid a cast when returning objects from an internal map, by using the class of the object as a key.

The UMBC Semantic Web Reference Card is a handy "cheat sheet" for semantic web developers and programmers. It can be printed double sided on one sheet of paper and tri-folded. The card lists common RDF/RDFS/OWL classes and properties, popular namespaces and terms, XML datatypes, reserved terms, grammars and examples for encodings, etc.