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+++ b/Symbian3/SDK/Source/GUID-2B7F7484-3A44-4A96-9B5D-79DF8A09115A.dita	Thu Jan 21 18:18:20 2010 +0000
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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-2B7F7484-3A44-4A96-9B5D-79DF8A09115A" xml:lang="en"><title>How resource
+files work</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>In the Symbian platform, <xref href="GUID-5F749184-C804-41FC-BA81-038783BDC967.dita">resource</xref> files
+are used to define UI components used in applications. The UI components consist
+of data structures that are defined in resource files, and then are loaded
+by the classes controlling the UI implementation. When UI component implementation
+is split into these two approaches, it means that resources can be recompiled,
+for example for new languages, without having to recompile the application
+code (unless you change the resource identifiers).</p>
+<p>The following resource files are typically used as source files in Symbian
+applications:</p>
+<ul>
+<li><p><codeph>.rss</codeph> – resource source files used for UI
+components in the application. For more information, see <xref href="GUID-EC49B54F-7724-433B-BD7F-201DE3B7DAA6.dita">Resource
+file structure</xref>, <xref href="GUID-23A60DE7-B72D-41BD-9F1E-882D31A7E3C7.dita">Required
+resource file statements</xref>, and <xref href="GUID-2C74E932-B1CA-434B-AF96-66D52D689620.dita">Optional
+resource file statements</xref>.</p>
+</li>
+<li><p><codeph>_reg.rss</codeph> – resource source file used for
+registration. For more information, see <xref href="GUID-BF1AAA0D-DF2F-4E1D-A0D2-F419BD32F97A.dita">Creating
+registration resource files</xref>.</p>
+</li>
+<li><p><codeph>.hrh</codeph> – resource header file used to define
+enumerated sets of values. For more information, see <xref href="GUID-D52E98C3-F5EE-4CE1-A4F5-2EF41A066B8A.dita">Creating
+resource header files</xref>.</p>
+</li>
+<li><p><codeph>.rls</codeph> – localisation files used as a source
+for UI texts strings in applications, and for managing these texts. For more
+information, see <xref href="GUID-E111C4E8-1342-4E87-ACB4-5B630AF1501C.dita">Internationalization
+and localization</xref>.</p>
+</li>
+</ul>
+<p>The structures and symbolic IDs of these files are used in various ways
+in your code.</p>
+<p> The resource files above are then compiled to yield the following files:</p>
+<ul>
+<li><p><codeph>.rsc</codeph> or <parmname>rNN</parmname>, where
+NN is a two number Symbian locale ID - compiled, machine-readable resource
+files used by the application</p>
+<itemgroup/>
+</li>
+<li><p><codeph>.rsg</codeph> - generated resource header file containing
+the symbolic IDs of the resources for inclusion into your code</p></li>
+<li><p><codeph> _reg.rsc</codeph> or <parmname>_reg.rNN</parmname>,
+where NN is a two number Symbian locale ID - compiled, machine-readable resource
+file used for registration </p></li>
+</ul>
+<p>The <parmname>rsc</parmname>, <parmname>rNN</parmname>, and <parmname>_reg.rsc</parmname> files
+need to be included in your <parmname>sis</parmname> <xref href="GUID-61EE2BE0-7B86-42CD-A03F-857DD8FAC246.dita">installation
+file</xref> so that they are placed in the device when the application is <xref href="GUID-3BB12D99-8CD7-47B0-A788-C85EF206806C.dita">installed</xref>.</p>
+<p>When the application framework launches an application, it loads the
+application resource file. The application framework compares the system locale
+language setting with the available resource files, and loads the resource
+file whose extension matches the locale language code. If there is no match,
+then the system loads the resource file with the extension <parmname>rsc</parmname>.</p>
+</conbody></concept>
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