author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Fri, 22 Jan 2010 18:26:19 +0000 | |
changeset 1 | 25a17d01db0c |
child 3 | 46218c8b8afa |
permissions | -rw-r--r-- |
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Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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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-F7CC81CE-E823-5196-944A-5F7524411A08" xml:lang="en"><title>Registration |
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and Discovery</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>Server applications need to advertise what services they provide and clients |
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of server application services need to know what implementations of the services |
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exist. This happens through Apparc's application registration file system. </p> |
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<p>Application registration files have a table in which applications can list |
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the service UIDs that they implement. For each service UID listed, there is |
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an associated opaque (i.e. not interpreted by the framework) data field which |
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indicates how the service is implemented by that application. The opaque data |
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field is accessed through an <codeph>LLINK</codeph> into a resource elsewhere |
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in the application registration file group. The meaning of this opaque data |
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field is not known to the framework, it will vary according to the service. |
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For some services the opaque data field may be a name intended for user display, |
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for others it may be structured data that the service's client-side code can |
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interpret. </p> |
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<fig id="GUID-84072240-5DC6-5900-B767-FD13666A6639"> |
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<image href="GUID-7F7A449F-CC19-570C-A6C1-BC470256AA8C_d0e147711_href.png" placement="inline"/> |
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</fig> |
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<p>Clients of a service can discover which applications implement a particular |
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service by using <xref href="GUID-5EEE8745-F483-33C0-A5B1-AEB5544DE2BA.dita"><apiname>RApaLsSession</apiname></xref>. This has a number of APIs |
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for retrieving an application list, filtered to only include applications |
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that implement a particular service. <codeph>RApaLsSession</codeph> can also |
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return other information about server applications, including how the services |
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are implemented as described by the opaque data field. If a service uses the |
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opaque data field to store localised strings to describe implementations, |
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these can be shown to the user. If a service uses structured data, a resource |
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reader can be created over the opaque data field to extract the data. </p> |
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<p>Also see the 'Service list' section in <xref href="GUID-A6116E8B-9C4A-5B9E-AA8A-BE031408AA2F.dita">Defining |
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application icons, captions and properties</xref>. </p> |
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<section><title>See also</title><p><xref href="GUID-940F3F6E-BA9C-5E19-9AC5-D848B5E175FB.dita">Application |
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Architecture Overview</xref></p></section> |
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</conbody></concept> |