1 files changed, 8 insertions, 1 deletions

diff --git a/lib/owl.rb b/lib/owl.rb
index 245dcc7..a4c2e68 100644
--- a/lib/owl.rb
+++ b/lib/owl.rb
@@ -1,3 +1,10 @@
+# RDF namespaces
+RDF = Redland::Namespace.new 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
+OWL = Redland::Namespace.new 'http://www.w3.org/2002/07/owl#'
+DC = Redland::Namespace.new 'http://purl.org/dc/elements/1.1/'
+OT = Redland::Namespace.new 'http://www.opentox.org/api/1.1#'
+#OT = Redland::Namespace.new 'http://ortona.informatik.uni-freiburg.de/opentox.owl#'
+XML = Redland::Namespace.new 'http://www.w3.org/2001/XMLSchema#'
 
 # overriding literal to give nice access to datatype
 # and to access the stored value as correct ruby type
@@ -537,4 +544,4 @@ module OpenTox
       end
     end
   end
-end
\ No newline at end of file
+end