Symbian3/SDK/Source/GUID-4C35C86A-D57F-503B-8E55-5D235E0D6DA0.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Wed, 31 Mar 2010 11:11:55 +0100
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-4C35C86A-D57F-503B-8E55-5D235E0D6DA0" xml:lang="en"><title>What
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is Versioning?</title><shortdesc>This topic describes the purpose and uses of versioning. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>Tools and applications use a set of classes to represent the data in the
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Comms Database. These classes are the container classes, which derive from <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>CMDBElement</apiname></xref> and <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>MMetaDatabase</apiname></xref>. </p>
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<p>The format of the data does not match the format of the data in the database.
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The implementation of the CommsDat API maps between the external format and
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the internal format. </p>
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<p>Future releases of Symbian platform can change the internal format. The
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map between the external format and the internal format maintains compatibility
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for tools and applications if the internal format changes. </p>
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<p>A new internal format is a new version of the interface. If a new version
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is created, the older version is deprecated, but Symbian platform maintains
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the compatibility for a managed period. </p>
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<p>You specify the version you need when you create a session with the Comms
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Database. </p>
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<p>A version is defined by an instance of the <xref href="GUID-1CDD0B97-8B00-3373-9908-512C9BC1CF51.dita"><apiname>TVersion</apiname></xref> class. </p>
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<p>In practice, changes to versions are extremely rare. The curent version
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is the same version used when the Comms Database was added to Symbian platform. </p>
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</conbody></concept>