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See http://www.w3.org/TR/sparql11-update/ and https://wiki.duraspace.org/display/FF/Object+properties+and+SPARQL-UPDATE for more information.
Namespaces
In Fedora 4 all namespaces used should be registered, the Namespaces page lists all registered namespaces and allows the user to register new namespaces.
Search
This page can be reached by performing a search in the Navigation bar, properties about the search are listed first such as #searchTerms Below that in a separate box the results are displayed.