diff --git modules/rdf/rdf.module modules/rdf/rdf.module
index d6046cd..98d0236 100644
--- modules/rdf/rdf.module
+++ modules/rdf/rdf.module
@@ -81,10 +81,7 @@ function rdf_rdf_namespaces() {
     'dc'       => 'http://purl.org/dc/terms/',
     'foaf'     => 'http://xmlns.com/foaf/0.1/',
     'og'       => 'http://ogp.me/ns#',
-    'owl'      => 'http://www.w3.org/2002/07/owl#',
-    'rdf'      => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
     'rdfs'     => 'http://www.w3.org/2000/01/rdf-schema#',
-    'rss'      => 'http://purl.org/rss/1.0/',
     'sioc'     => 'http://rdfs.org/sioc/ns#',
     'sioct'    => 'http://rdfs.org/sioc/types#',
     'skos'     => 'http://www.w3.org/2004/02/skos/core#',