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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 xml:lang="en" id="GUID-053FFF2B-6FB1-5065-B9D1-047477F3DE01"><title>Introduction to dictionary stores</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>A dictionary store is a store where all streams are accessed through a UID, rather than directly by stream ID.</p> <p>A dictionary store contains streams in the usual way but, in addition, the root stream is a stream dictionary, i.e. the external representation of a <codeph>CStreamDictionary</codeph> object, a list of two-way associations between UIDs and stream ids.</p> <p>The following diagram illustrates the concept of the dictionary store.</p> <fig id="GUID-6EEADFD0-FFCD-513F-BC26-99B46B54D600"><title>Dictionary store</title> <image href="GUID-22699952-D032-5B69-B38A-43347A40A420_d0e335124_href.png" placement="inline"/></fig> <p>The interface to a dictionary store is provided by the <codeph>CDictionaryStore</codeph> abstract class. The classes for concrete dictionary stores are derived from this abstract class; for example, <codeph>CDictionaryFileStore</codeph> is a concrete dictionary store class which is implemented using a file store. </p> <p>Note that a dictionary store does not derive from <codeph>CStreamStore</codeph>, but owns a persistent store, a <codeph>CPersistentStore</codeph> type, and a stream dictionary, a <codeph>CStreamDictionary</codeph> type, as part of its implementation.</p> <p><b>See also</b> </p> <p><xref href="GUID-5592E9C1-D490-538F-9B11-5EFB72DEDBE2.dita">File based dictionary store</xref> </p> <p><xref href="GUID-F535B464-3125-549B-9130-E59B64C4B865.dita">Stream dictionaries</xref> </p> <p><xref href="GUID-A928E956-9800-5277-B0D3-34BBB2707AE1.dita">Stream ID</xref> </p> <p><xref href="GUID-95DF676F-F9BA-56E0-A4DE-E68B42C06932.dita">UID manipulation</xref> </p> </conbody></concept>
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