--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-13987218-9427-455E-AC77-ADE6B0E9CD7E.dita	Wed Mar 31 11:11:55 2010 +0100
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+<?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-13987218-9427-455E-AC77-ADE6B0E9CD7E" xml:lang="en"><title>Introduction
+to Symbian^3</title><shortdesc>The Symbian platform, is a comprehensive open-source software platform
+for Symbian-based devices. The platform is used by device manufactures to
+build devices, and by third-party developers to create after-market applications
+for installation onto devices.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<section id="GUID-1212158F-A8CF-41FE-A6B9-4461D90EA2A5"><title>Overview</title><p>The
+Symbian platform includes a customizable user interface, a rich set of applications,
+common user interface components (AVKON, UIKON) and development tools for
+implementing new applications. It also includes tools and documentation that
+enables device creators and application developers to create feature-rich
+devices and applications.</p><p>The Symbian platform architecture is divided
+into different layers:</p><ul>
+<li><p>The <b>Applications Layer</b> consists of application specific UI and
+engine components. It uses the services provided by Middleware and OS layers. </p></li>
+<li><p>The <b>Middleware Layer</b> consists of domains which provide services
+to the application layer; for example, Multimedia, Networking and Location
+services.</p></li>
+<li><p>The <b>Operating System (OS) Layer</b> provides all higher-level
+OS services across a full range of technology domains such as communications,
+networking, graphics, multimedia and so on. It also includes low-level OS
+services such as frameworks, libraries and utilities, which turn the abstracted
+hardware and OS mechanisms into a programmable interface. </p></li>
+<li><p>The <b>Adaptation layer</b> integrates the generic platform software
+with the phone’s cellular platform. It is implemented by the device creators
+though reference implementations are provided with the platform.</p><draft-comment time="2009-12-08T14:38" translate="no">Give link to the adaptation documentation.</draft-comment></li>
+<li><p>The <b>Cellular Platform</b> is the device-specific hardware and cellular
+software that performs the services required by the Symbian platform.</p></li>
+</ul><p>For more information about layers of the Symbian platform and the
+packages contained within it, see the <xref href="http://developer.symbian.org/downloads/system_models/foundationpkg_22-05-09.svg" scope="external">Package view of the current Symbian Foundation platform</xref>.</p><fig id="GUID-AD79AEF5-1DB3-47F7-9B42-FE5C7FE7C6A3">
+<title>Architecture of the Symbian platform</title>
+<image href="GUID-6913F58F-FDA1-4708-B03E-16AF6C545E5B_d0e1315_href.jpg" placement="inline"/>
+</fig><p>A layer can have packages from any <xref href="http://developer.symbian.org/main/source/technology_domains/index.php.dita">technology
+domain</xref>. Technology domains are a group of packages, each of which is
+a collection of components. To understand more about the architecture, what
+the platform offers, see <xref href="http://developer.symbian.org/wiki/index.php/Main_Page.dita">Introduction
+to Symbian Developer Community</xref>.</p></section>
+<section id="GUID-6D6715BB-B591-4C97-82BF-1AA68079B45C"><title>Platform UID</title><p>The
+platform UID for Symbian^3 is 0x20022E6D.</p></section>
+<section id="GUID-177B4AB9-E89E-4AF4-8BC9-503E9F747FE3"><title>Download</title><ul>
+<li><p>You can download the Application Development Toolkit and Product Development
+Toolkit from the <xref href="http://developer.symbian.org/main/tools_and_kits/index.php" scope="external">Symbian Developer</xref> Website.</p></li>
+
+</ul></section>
+</conbody><related-links>
+<linklist>
+<link href="GUID-6F1ED7D0-5F41-4587-89AA-8DDE7AEC916F.dita"><linktext>What's new
+in Symbian^3</linktext></link>
+<link href="GUID-AB69D251-7635-4325-BBCE-92F7AFC86DC2.dita"><linktext>New C++ APIs
+in Symbian^3</linktext></link>
+<link href="GUID-BA0A115B-068C-4257-9489-DF35DF633AD2.dita"><linktext>Porting applications
+to Symbian^3</linktext></link>
+</linklist>
+</related-links></concept>
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