nsMgr.updatePrefix("skos", "http://www.w3.org/2004/02/skos/core#"); EditableNamespaceContext context = (EditableNamespaceContext) nsMgr.readAll(); context = (EditableNamespaceContext) nsMgr.readAll(); context = (EditableNamespaceContext) nsMgr.readAll(); assertTrue("Failed to delete all namespaces", context == null || context.size() == 0);