--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-772DFFA1-4BBC-516F-909D-47CB773760F5.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,31 @@
+<?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-772DFFA1-4BBC-516F-909D-47CB773760F5" xml:lang="en"><title>Packages
+as type-safe descriptors</title><shortdesc>Describes the package function to transfer data in correct structure. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>Descriptors are often used as the basis of data transfer within Symbian
+platform. For example, inter-thread data transfer is specified in terms of
+transferring data from a descriptor valid in the context of one thread, to
+a descriptor valid in the context of another.</p>
+<p>Data to be transferred almost always has a well defined structure and it
+is important that the receiver of the data has some guarantee that the correct
+structure has been passed. This is type safety.</p>
+<p>A package <i>is</i> a descriptor and also acts as a wrapper around it.
+It allows objects and data structures to be represented by descriptors in
+a type safe way. Objects are either contained within a modifiable buffer descriptor
+or are represented by pointer descriptors.</p>
+<p>A package class is templated, the template parameter being the type of
+the object represented. The use of a template provides the required type safety.</p>
+</conbody><related-links>
+<link>
+<desc><xref href="GUID-79BAF19D-F003-5468-9C01-6E918B06C36D.dita">Descriptor concepts</xref></desc>
+</link>
+</related-links></concept>
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