--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-6A37628A-C732-5765-9DC5-3AC691C2CD50.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-6A37628A-C732-5765-9DC5-3AC691C2CD50" xml:lang="en"><title>Supporting
+polymorphic interface DLLs with static interface DLLs</title><shortdesc>Explains how to support polymorphic interface DLLs with static
+interface DLLs.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>In the previous sections showing how to use polymorphic interface DLLs,
+the class declaration contains only pure virtual functions. In real applications,
+the implementation of some of these functions could be the same in all implementation
+DLLs, leading to duplication of code.</p>
+<p>An abstract base class, intended for derivation in a polymorphic interface
+DLL, can include functions declared as <codeph>IMPORT_C</codeph>. Such functions
+must be implemented in a static interface DLL.</p>
+<p>When a polymorphic interface DLL is loaded by <codeph>RLibrary::Load()</codeph>,
+any static interface DLLs required by the polymorphic interface DLL are also
+loaded.</p>
+<p>If this technique is used, one function that can be usefully implemented
+in the statically loaded DLL is an empty destructor.</p>
+</conbody></concept>
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