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diff --git a/include/yazpp/pdu-observer.h b/include/yazpp/pdu-observer.h
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+++ b/include/yazpp/pdu-observer.h
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+/*
+ * Copyright (c) 1998-2005, Index Data.
+ * See the file LICENSE for details.
+ * 
+ * $Id: pdu-observer.h,v 1.1 2006-03-29 13:14:15 adam Exp $
+ */
+
+#ifndef YAZ_PDU_OBSERVER_H
+#define YAZ_PDU_OBSERVER_H
+
+#include <yaz/yconfig.h>
+
+namespace yazpp_1 {
+
+class IPDU_Observer;
+
+/** Protocol Data Unit Observable.
+    This interface implements a Protocol Data Unit (PDU) network driver.
+    The PDU's is not encoded/decoded by this interface. They are simply
+    transmitted/received over the network. To use this interface the
+    IPDU_Observer interface must be implemented.
+ */
+class YAZ_EXPORT IPDU_Observable {
+ public:
+    /// Send encoded PDU buffer of specified length
+    virtual int send_PDU(const char *buf, int len) = 0;
+    /// Connect with server specified by addr.
+    virtual int connect(IPDU_Observer *observer, const char *addr) = 0;
+    /// Listen on address addr.
+    virtual int listen(IPDU_Observer *observer, const char *addr) = 0;
+    /// Close connection
+    virtual void close() = 0;
+    /// Make clone of this object using this interface
+    virtual IPDU_Observable *clone() = 0;
+    /// Destroy completely
+    virtual void destroy() = 0;
+    /// Set Idle Time
+    virtual void idleTime (int timeout) = 0;
+    /// Get peername
+    virtual const char *getpeername() = 0;
+
+    virtual ~IPDU_Observable();
+};
+
+/** Protocol Data Unit Observer.
+    This interface is used together with the IPDU_Observable interface
+    and acts as a callback interface for it.
+ */
+class YAZ_EXPORT IPDU_Observer {
+ public:
+    /// A PDU has been received
+    virtual void recv_PDU(const char *buf, int len) = 0;
+    /// Called when Iyaz_PDU_Observable::connect was successful.
+    virtual void connectNotify() = 0;
+    /// Called whenever the connection was closed
+    virtual void failNotify() = 0;
+    /// Called whenever there is a timeout
+    virtual void timeoutNotify() = 0;
+    /// Make clone of observer using IPDU_Observable interface
+    virtual IPDU_Observer *sessionNotify(
+        IPDU_Observable *the_PDU_Observable, int fd) = 0;
+
+    virtual ~IPDU_Observer();
+};
+};
+
+#endif
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+