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diff --git a/cpp/include/libaddressinput/supplier.h b/cpp/include/libaddressinput/supplier.h
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+++ b/cpp/include/libaddressinput/supplier.h
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+// Copyright (C) 2014 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef I18N_ADDRESSINPUT_SUPPLIER_H_
+#define I18N_ADDRESSINPUT_SUPPLIER_H_
+
+#include <libaddressinput/callback.h>
+#include <libaddressinput/util/basictypes.h>
+
+namespace i18n {
+namespace addressinput {
+
+class LookupKey;
+class Rule;
+
+// Interface for objects that are able to supply the AddressValidator with the
+// metadata needed to validate an address, as described by a LookupKey.
+class Supplier {
+ public:
+  struct RuleHierarchy;
+  typedef i18n::addressinput::Callback<const LookupKey&,
+                                       const RuleHierarchy&> Callback;
+
+  virtual ~Supplier() {}
+
+  // Aggregates the metadata needed for |lookup_key| into a RuleHierarchy
+  // object, then calls |supplied|. Implementations of this interface may
+  // either load the necessary data on demand, or fail if the necessary data
+  // hasn't already been loaded.
+  virtual void Supply(const LookupKey& lookup_key,
+                      const Callback& supplied) = 0;
+
+  // A RuleHierarchy object encapsulates the hierarchical list of Rule objects
+  // that corresponds to a particular LookupKey.
+  struct RuleHierarchy {
+    RuleHierarchy() : rule() {}
+    const Rule* rule[4];  // Cf. LookupKey::kHierarchy.
+  };
+};
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_SUPPLIER_H_