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-rw-r--r--src/namespaces.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/namespaces.h b/src/namespaces.h
index e98eb5e1..5e2aa8c7 100644
--- a/src/namespaces.h
+++ b/src/namespaces.h
@@ -17,7 +17,9 @@
#ifndef SERD_NAMESPACES_H
#define SERD_NAMESPACES_H
-#define NS_XSD "http://www.w3.org/2001/XMLSchema#"
+#define NS_OWL "http://www.w3.org/2002/07/owl#"
#define NS_RDF "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+#define NS_RDFS "http://www.w3.org/2000/01/rdf-schema#"
+#define NS_XSD "http://www.w3.org/2001/XMLSchema#"
#endif // SERD_NAMESPACES_H