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diff --git a/qpid/cpp/src/qpid/messaging/MessageImpl.h b/qpid/cpp/src/qpid/messaging/MessageImpl.h
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+++ b/qpid/cpp/src/qpid/messaging/MessageImpl.h
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+#ifndef QPID_MESSAGING_MESSAGEIMPL_H
+#define QPID_MESSAGING_MESSAGEIMPL_H
+
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ *
+ */
+#include "qpid/messaging/Address.h"
+#include "qpid/types/Variant.h"
+#include "qpid/framing/SequenceNumber.h"
+
+namespace qpid {
+namespace messaging {
+
+struct MessageImpl
+{
+    Address replyTo;
+    std::string subject;
+    std::string contentType;
+    std::string messageId;
+    std::string userId;
+    std::string correlationId;
+    uint8_t priority;
+    uint64_t ttl;
+    bool durable;
+    bool redelivered;
+    qpid::types::Variant::Map headers;
+
+    std::string bytes;
+
+    qpid::framing::SequenceNumber internalId;
+
+    MessageImpl(const std::string& c);
+    MessageImpl(const char* chars, size_t count);
+
+    void setReplyTo(const Address& d);
+    const Address& getReplyTo() const;
+    
+    void setSubject(const std::string& s);
+    const std::string& getSubject() const;
+    
+    void setContentType(const std::string& s);
+    const std::string& getContentType() const;
+    
+    const qpid::types::Variant::Map& getHeaders() const;
+    qpid::types::Variant::Map& getHeaders();
+    void setHeader(const std::string& key, const qpid::types::Variant& val);
+    
+    void setBytes(const std::string& bytes);
+    void setBytes(const char* chars, size_t count);
+    const std::string& getBytes() const;
+    std::string& getBytes();
+
+    void setInternalId(qpid::framing::SequenceNumber id);
+    qpid::framing::SequenceNumber getInternalId();
+
+};
+
+class Message;
+
+/**
+ * Provides access to the internal MessageImpl for a message which is
+ * useful when accessing any message state not exposed directly
+ * through the public API.
+ */
+struct MessageImplAccess
+{
+    static MessageImpl& get(Message&);
+    static const MessageImpl& get(const Message&);
+};
+
+}} // namespace qpid::messaging
+
+#endif  /*!QPID_MESSAGING_MESSAGEIMPL_H*/