Resources (Containers and NonRdfSourceDescriptions) in Fedora 4 have a number of RDF types that nominally describe characteristics of the resource. The "Types" link in the navigation bar takes you to a display of all the RDF types that have been registered within the repository.
Many of the types listed are constructs for a Java Content Repository on which Fedora 4 is built and need not be modified or even understood in order to use your Fedora 4 repository.
