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diff --git a/odb/odb/traversal/relational/key.hxx b/odb/odb/traversal/relational/key.hxx
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+++ b/odb/odb/traversal/relational/key.hxx
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+// file      : odb/traversal/relational/key.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_TRAVERSAL_RELATIONAL_KEY_HXX
+#define ODB_TRAVERSAL_RELATIONAL_KEY_HXX
+
+#include <odb/semantics/relational/key.hxx>
+#include <odb/traversal/relational/elements.hxx>
+
+namespace traversal
+{
+  namespace relational
+  {
+    struct contains: edge<semantics::relational::contains>
+    {
+      contains () {}
+      contains (node_dispatcher& n) {node_traverser (n);}
+
+      virtual void
+      traverse (type&);
+    };
+
+    template <typename T>
+    struct key_template: node<T>
+    {
+    public:
+      virtual void
+      traverse (T& k)
+      {
+        contains (k);
+      }
+
+      virtual void
+      contains (T& k)
+      {
+        contains (k, *this);
+      }
+
+      virtual void
+      contains (T& k, edge_dispatcher& d)
+      {
+        this->iterate_and_dispatch (k.contains_begin (), k.contains_end (), d);
+      }
+    };
+
+    struct key: key_template<semantics::relational::key> {};
+  }
+}
+
+#endif // ODB_TRAVERSAL_RELATIONAL_KEY_HXX