Namespaces
A Fedora repository includes a number of pre-defined namespace bindings (essentially, a mapping that connects a particular prefix to a URI, allowing for a more convenient and human-readable rendering of RDF). Predefined namespaces include DC, FOAF, Fedora, and LDP, among others. As additional namespaces are used in the course of depositing materials into the repository, each new namespace will automatically be bound to its own prefix the first time it is used. Once a URI is bound to a particular namespace prefix, it cannot be changed, except in certain cases through the use of a special tool for this purpose. A full list of the bound namespaces for a given Fedora repository at any given moment can be seen in the HTTP REST interface, as a list of pre-populated "PREFIX ..." bindings in the SPARQL update query text-box.
...