--- a/Symbian3/SDK/Source/GUID-6482956D-C3A3-5B68-A37F-4250C85B0D82.dita	Fri Jul 16 17:23:46 2010 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,53 +0,0 @@
-<?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-6482956D-C3A3-5B68-A37F-4250C85B0D82" xml:lang="en"><title>Polymorphic
-interface DLLs</title><prolog><metadata><keywords/></metadata></prolog><conbody>
-<p>A polymorphic DLL contains an interface defined by a gate function and
-an abstract class with at least one virtual function. </p>
-<p>The polymorphic DLL exports the gate function at ordinal 1, which typically
-constructs a concrete class derived from the abstract interface. The virtual
-function is then called, and the functions of the class are available. </p>
-<p>Examples of polymorphic DLLs in Symbian platform include ECom plug-ins,
-device drivers, Front End Processors, and many more. </p>
-<p>Each type of interface should specify its own UID, which is used as <codeph>uid2</codeph> for
-the polymorphic DLL. </p>
-<p>The function responsible for loading a polymorphic DLL should check that
-its <codeph>uid2</codeph> corresponds with the expected interface type. </p>
-<p>For polymorphic DLLs, the interpretation of <codeph>uid3</codeph> depends
-on the interface type. <codeph>uid3</codeph> may not be required by all interfaces. </p>
-<p>The build process for a polymorphic DLL produces an import library, but
-it is not used. </p>
-<section><title>mmp project specification</title><p>The project
-file for a polymorphic DLL must specify the correct target type and UIDs:</p><ul>
-<li id="GUID-0E19AFC8-5242-561B-B9DC-085839CF8604"><p>Specify the <codeph>TARGETTYPE</codeph> line
-as: </p> <codeblock id="GUID-89A9AD1C-3A1D-5733-B8DD-BE40ECAC747C" xml:space="preserve">TARGETTYPE dll</codeblock> <p>This
-implicitly specifies <codeph>UID1</codeph> correctly. Note that some types
-of polymorphic DLLs, have particular support by the build tools, and have
-their own different target types. See <xref href="GUID-A27A05A2-B161-54D2-92E0-8620B01BFD44.dita">Polymorphic
-DLL targettype summary</xref>. </p> </li>
-<li id="GUID-778C0445-7C95-53F9-AA52-69C37416782C"><p>Specify the UID for
-the DLL in a <codeph>UID</codeph> line: </p> <codeblock id="GUID-CB104F6E-EB57-54EC-8403-B2D4F8BB35D6" xml:space="preserve">UID &lt;UID2&gt; &lt;UID3&gt;</codeblock> <p>The <varname>UID2</varname> value is defined by the interface which is being implemented.
-Some types of polymorphic DLL also require a third UID, but, if so, its meaning
-is defined by the DLL. </p> </li>
-</ul></section>
-<example><p>An example of a project file (<filepath>PolymorphicDLL1.mmp</filepath>)
-for a polymorphic DLL is given below.</p><codeblock id="GUID-85177FF3-7CEC-5DC5-9014-972E33D605C6" xml:space="preserve">TARGET        PolymorphicDLL1.dll
-TARGETTYPE    dll
-UID           0x10004262 0x10004264
-SOURCEPATH    .
-SOURCE        PolymorphicDLL1.cpp
-USERINCLUDE   .
-USERINCLUDE   ..\UsingDLLs
-SYSTEMINCLUDE \Epoc32\include
-LIBRARY       euser.lib
-EXPORTUNFROZEN</codeblock></example>
-</conbody></concept>
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