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diff --git a/odb/odb/relational/validator.hxx b/odb/odb/relational/validator.hxx
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+// file      : odb/relational/validator.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_RELATIONAL_VALIDATOR_HXX
+#define ODB_RELATIONAL_VALIDATOR_HXX
+
+#include <odb/options.hxx>
+#include <odb/features.hxx>
+#include <odb/semantics/unit.hxx>
+
+namespace relational
+{
+  // The first pass is performed before processing. The second -- after.
+  // Throws operation_failed to signal a failure.
+  //
+  void
+  validate (options const&,
+            features&,
+            semantics::unit&,
+            semantics::path const&,
+            unsigned short pass);
+}
+
+#endif // ODB_RELATIONAL_VALIDATOR_HXX