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diff --git a/odb/odb/traversal/union-template.hxx b/odb/odb/traversal/union-template.hxx
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+++ b/odb/odb/traversal/union-template.hxx
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+// file      : odb/traversal/union-template.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_TRAVERSAL_UNION_TEMPLATE_HXX
+#define ODB_TRAVERSAL_UNION_TEMPLATE_HXX
+
+#include <odb/semantics/union-template.hxx>
+
+#include <odb/traversal/elements.hxx>
+#include <odb/traversal/union.hxx>
+
+namespace traversal
+{
+  struct union_template: scope_template<semantics::union_template> {};
+
+  struct union_instantiation: scope_template<semantics::union_instantiation>
+  {
+    virtual void
+    traverse (type&);
+
+    virtual void
+    instantiates (type&);
+
+    virtual void
+    instantiates (type&, edge_dispatcher&);
+  };
+}
+
+#endif // ODB_TRAVERSAL_UNION_TEMPLATE_HXX