diff -r 89d6a7a84779 -r 25a17d01db0c Symbian3/PDK/Source/GUID-C642BA79-0E9B-5C62-9DC7-C64759830CD4.dita
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/PDK/Source/GUID-C642BA79-0E9B-5C62-9DC7-C64759830CD4.dita	Fri Jan 22 18:26:19 2010 +0000
@@ -0,0 +1,26 @@
+<?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-C642BA79-0E9B-5C62-9DC7-C64759830CD4" xml:lang="en"><title>Dynamic
+buffers versus descriptors, arrays and heap cells</title><shortdesc>Explains the difference between various types of buffers.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The essential difference between dynamic buffers and more straightforward
+means of storing binary data is that C arrays and descriptors provide essentially
+non-extensible buffers. Any attempt to write beyond the end of a C array results
+in undefined (and usually disastrous) consequences. Any attempt to write beyond
+the end of a descriptor results in a panic.</p>
+<p>Heap cells may be extended, but not without limit; it may be impossible
+to extend a heap cell further, because the heap is exhausted, or too fragmented
+to permit the extension. In addition, if heap cell re-allocation results in
+movement of the cell, re-allocation can be unduly expensive. If re-allocation
+is undesirable, then a buffer could be extended by allocating a new segment
+in a new allocation cell. Segmented buffers have this behaviour: flat buffers
+use re-allocation alone.</p>
+</conbody></concept>
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