public Response deleteSinglePrefix(@PathParam("graphname") String graphName, @PathParam("prefix") String prefix) {
final RexsterApplicationGraph rag = this.getRexsterApplicationGraph(graphName);
try {
final SailGraph graph = ((SailGraph) rag.getUnwrappedGraph());
graph.removeNamespace(prefix);
rag.tryCommit();
this.resultObject.put(Tokens.QUERY_TIME, this.sh.stopWatch());