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diff --git a/qpid/cpp/src/qpid/messaging/MessageImpl.h b/qpid/cpp/src/qpid/messaging/MessageImpl.h
new file mode 100644
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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/messaging/Codec.h"
+#include "qpid/messaging/MessageContent.h"
+#include "qpid/messaging/Variant.h"
+#include "qpid/framing/SequenceNumber.h"
+
+namespace qpid {
+namespace messaging {
+
+struct MessageImpl : MessageContent
+{
+    Address replyTo;
+    std::string subject;
+    std::string contentType;
+    Variant::Map headers;
+
+    std::string bytes;
+    Variant content;//used only for LIST and MAP
+    VariantType type;//if LIST, MAP content holds the value; if VOID bytes holds the value
+
+    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 Variant::Map& getHeaders() const;
+    Variant::Map& getHeaders();
+    
+    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();
+
+    bool isVoid() const;
+
+    const std::string& asString() const;
+    std::string& asString();
+
+    const char* asChars() const;
+    size_t size() const;
+
+    const Variant::Map& asMap() const;
+    Variant::Map& asMap();
+    bool isMap() const;
+
+    const Variant::List& asList() const;
+    Variant::List& asList();
+    bool isList() const;
+
+    void clear();
+
+    void getEncodedContent(Codec& codec, std::string&) const;
+    void encode(Codec& codec);
+    void decode(Codec& codec);
+
+    Variant& operator[](const std::string&);
+
+    std::ostream& print(std::ostream& out) const;
+
+    //operator<< for variety of types...
+    MessageContent& operator<<(const std::string&);
+    MessageContent& operator<<(const char*);
+    MessageContent& operator<<(bool);
+    MessageContent& operator<<(int8_t);
+    MessageContent& operator<<(int16_t);
+    MessageContent& operator<<(int32_t);
+    MessageContent& operator<<(int64_t);
+    MessageContent& operator<<(uint8_t);
+    MessageContent& operator<<(uint16_t);
+    MessageContent& operator<<(uint32_t);
+    MessageContent& operator<<(uint64_t);
+    MessageContent& operator<<(double);
+    MessageContent& operator<<(float);
+
+    //assignment from string, map and list
+    MessageContent& operator=(const std::string&);
+    MessageContent& operator=(const char*);
+    MessageContent& operator=(const Variant::Map&);
+    MessageContent& operator=(const Variant::List&);
+
+    template <class T> MessageContent& append(T& t);
+};
+
+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*/