| author | Eugene Ostroukhov <eugeneo@symbian.org> |
| Fri, 04 Jun 2010 09:44:40 -0700 | |
| changeset 345 | 7723a46fe224 |
| parent 229 | 716254ccbcc0 |
| permissions | -rw-r--r-- |
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<!DOCTYPE html |
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><meta name="copyright" content="(C) Copyright 2009"/><meta name="DC.rights.owner" content="(C) Copyright 2009"/><meta name="DC.Type" content="mobileconcept"/><meta name="DC.Title" content="Accessing and managing information about landmarks"/><meta name="DC.Relation" scheme="URI" content="GUID-4DDE31C7-EC0D-4EEC-BC3A-A0B0351154F8"/><meta name="DC.Relation" scheme="URI" content="GUID-662F2E2E-9538-42E5-9B5A-5664F1C11A9E"/><meta name="DC.Relation" scheme="URI" content="GUID-1EFD7043-E9B8-4B4E-9EA6-A20B3EECC14A"/><meta name="DC.Relation" scheme="URI" content="GUID-46EABDC1-37CB-412A-ACAD-1A1A9466BB68"/><meta name="DC.Format" content="XHTML"/><meta name="DC.Identifier" content="GUID-D581028C-06ED-422D-866E-AE6C93075084"/><title>Accessing |
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and managing information about landmarks </title><script type="text/javascript"> |
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function initPage() {}
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</script><link href="../PRODUCT_PLUGIN/book.css" rel="stylesheet" type="text/css"/><link href="css/s60/style.css" rel="stylesheet" type="text/css" media="all"/></head><body onload="initPage();"><div class="body"><div class="contentLeft prTxt"><h1 class="pageHeading" id="GUID-D581028C-06ED-422D-866E-AE6C93075084">Accessing |
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and managing information about landmarks</h1><div> |
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<p>The <a href="GUID-B8845FF1-D7F6-476A-8651-8B9C12D8789F.html#GUID-B8845FF1-D7F6-476A-8651-8B9C12D8789F">Landmarks |
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Service API</a> allows <span>widgets</span> to access and manage information |
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about landmarks and landmark categories. This information is stored in one |
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or more landmark databases on a device. You can use the Landmarks Service |
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to create <span>widgets</span> that:</p> |
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<ul> |
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<li><p>Retrieve information about landmarks, landmark categories, |
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and landmark databases</p></li> |
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<li><p>Create, edit, and delete landmarks and landmark categories</p> |
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</li> |
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<li><p>Import and export landmarks</p></li> |
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<li><p>Organize landmarks into landmark categories</p></li> |
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</ul> |
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<p>The Landmarks Service involves the following concepts:</p> |
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<ul> |
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<li><p><strong>Landmark</strong> is defined as a location with a name. The |
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location of a landmark is expressed as a set of geographical coordinates accompanied |
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by either coordinate measurement accuracy information or a textual description, |
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such as an address. A landmark can be used as Point of Interest (POI). Each |
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landmark has a unique ID that distinguishes it from other landmarks in the |
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same database. The ID is assigned when the landmark is added to the database.</p> |
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<p>For detailed information about landmark objects, see section <a href="GUID-2B3FD0AF-2552-46AB-83B5-F404506D16EE.html#GUID-2B3FD0AF-2552-46AB-83B5-F404506D16EE">Landmark</a>.</p> |
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</li> |
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<li><p><strong>Landmark category</strong> groups landmarks according to type |
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and interest. For example, a category can denote geographical or architectural |
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interest, or it can relate to a particular type of attraction or activity. |
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Each category has a unique name and ID that distinguish it from other categories |
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in the same database. The ID is assigned when the category is added to the |
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database.</p> |
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<p>Landmark categories are further classified as follows:</p> |
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<ul> |
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<li><p><strong>Local categories</strong> are created by the user for a specific |
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database. A local category is only valid for landmarks in the same database |
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for which the category was created.</p></li> |
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<li><p><strong>Global categories</strong> exist across all databases and have |
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unique global IDs associated with them. Global categories are valid for all |
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landmarks in all databases. Accommodation, Businesses, and Education, for |
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example, are global categories.</p></li> |
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</ul> |
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<p>For detailed information about landmark category objects, see section <a href="GUID-40EAD781-6B30-406E-B05F-0BE932EFE86A.html#GUID-40EAD781-6B30-406E-B05F-0BE932EFE86A">Landmark category</a>.</p> |
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</li> |
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<li><p><strong>Landmark database</strong> stores landmarks and landmark categories. |
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Each database has a unique URI that identifies the database.</p> |
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<p>Landmark databases are further classified as follows:</p> |
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<ul> |
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<li><p><strong>Local databases</strong> reside on the device or on some device |
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mapped to the device's file system. The default database is <code>file://c:eposlm.ldb</code>. |
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If the device does not contain the default database, it is created when it |
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is called for the first time by a service request.</p> |
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<p>The URI of a local landmark database consists of a protocol specifier |
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and the database location: <code>file://<location></code>. If no |
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protocol is specified, <code>file://</code> is used by default. The |
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location consists of the drive and the database file name, for example <code>c:landmarks.ldb</code>. |
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The path to the file cannot be specified. The extension of the database file |
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name must be <code>ldb</code>.</p> |
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</li> |
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<li><p><strong>Remote databases</strong> reside in third-party servers and |
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are accessed using a specific protocol. Creating or deleting remote databases |
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results in adding or removing a bookmark on the device, respectively.</p> |
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<div class="note"><p><strong class="note_title">Note: </strong>Remote databases and associated operations are not currently supported.</p> |
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</div> |
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</li> |
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</ul> |
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<p>For detailed information about landmark database objects, see section <a href="GUID-5A23A9AC-2BC4-4D05-82FF-980986CFF4F6.html#GUID-5A23A9AC-2BC4-4D05-82FF-980986CFF4F6">Landmark database</a>.</p> |
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</li> |
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</ul> |
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<div><h3>Accessing the API and supported methods</h3> |
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<p>To create a <a href="GUID-04095E9A-50E7-4E5F-BD6F-71DA281A0080.html#GUID-04095E9A-50E7-4E5F-BD6F-71DA281A0080">service |
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object</a> for the Landmarks Service API, use <code>Service.Landmarks</code> to |
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identify the service provider and <code>IDataSource</code> to identify |
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the supported interface:</p> |
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<pre class="codeblock" id="GUID-3B84DF19-5D49-49E6-9A22-A97066C3FF8C">var so = device.getServiceObject("Service.Landmarks", "IDataSource");</pre>
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<p/> |
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<p>The <code>IDataSource</code> interface provides the following |
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methods:</p> |
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<ul> |
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<li><p><a href="GUID-E138B464-2086-4E74-B356-ACF8687BBB5A.html#GUID-E138B464-2086-4E74-B356-ACF8687BBB5A"><code>New()</code></a></p> |
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<p>Use the <code>New()</code> method to create an empty landmark |
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or landmark category item. You can use this item as a template.</p> |
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</li> |
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<li><p><a href="GUID-55591BBC-49F8-407D-98F5-1D2FCD5DFB34.html#GUID-55591BBC-49F8-407D-98F5-1D2FCD5DFB34"><code>GetList()</code></a></p> |
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<p>Use the <code>GetList()</code> method to retrieve information |
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about landmarks, landmark categories, or landmark databases.</p> |
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</li> |
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<li><p><a href="GUID-D85C2567-F041-42A1-A2B5-650FCAAD60A9.html#GUID-D85C2567-F041-42A1-A2B5-650FCAAD60A9"><code>Add()</code></a></p> |
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<p>Use the <code>Add()</code> method to add a new landmark or landmark |
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category to a landmark database. You can also use this method to edit an existing |
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landmark or landmark category.</p> |
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</li> |
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<li><p><a href="GUID-2B13380C-37C8-473F-B0A7-564439312DA3.html#GUID-2B13380C-37C8-473F-B0A7-564439312DA3"><code>Delete()</code></a></p> |
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<p>Use the <code>Delete()</code> method to delete a landmark or |
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landmark category from a landmark database.</p> |
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<div class="note"><p><strong class="note_title">Note: </strong>You cannot delete landmark databases.</p> |
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</div> |
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</li> |
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<li><p><a href="GUID-4D4E5B3E-ABC4-43CA-A7E8-027C46BD1FE6.html#GUID-4D4E5B3E-ABC4-43CA-A7E8-027C46BD1FE6"><code>Import()</code></a></p> |
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<p>Use the <code>Import()</code> method to import landmarks to |
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a landmark database.</p> |
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</li> |
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<li><p><a href="GUID-A9024277-4FA2-429D-9C54-A155ED658B32.html#GUID-A9024277-4FA2-429D-9C54-A155ED658B32"><code>Export()</code></a></p> |
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<p>Use the <code>Export()</code> method to export landmarks from |
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a landmark database.</p> |
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</li> |
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<li><p><a href="GUID-B8869924-0E95-4543-954E-5A4246922CB4.html#GUID-B8869924-0E95-4543-954E-5A4246922CB4"><code>Organise()</code></a></p> |
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<p>Use the <code>Organise()</code> method to add landmarks to a |
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landmark category or to remove landmarks from a landmark category.</p> |
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</li> |
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<li><p><a href="GUID-6D7228E7-8E06-495D-85F7-A4B1716D4CDE.html#GUID-6D7228E7-8E06-495D-85F7-A4B1716D4CDE"><code>Cancel()</code></a></p> |
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<p>Use the <code>Cancel()</code> method to cancel an ongoing asynchronous |
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call. This method is valid for any asynchronous call made through the Landmarks |
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Service API.</p> |
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</li> |
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</ul> |
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</div> |
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<div><h3>Using the service in a widget</h3> |
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<p>To access and manage landmark information using the Landmarks Service |
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API:</p> |
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<ol> |
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<li id="GUID-E8ECDB2F-00C4-488F-A253-87FABDA66CA6-GENIDd0e7896"><a name="GUID-E8ECDB2F-00C4-488F-A253-87FABDA66CA6-GENIDd0e7896"><!----></a><p>Create a service |
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object for the API using <a href="GUID-04095E9A-50E7-4E5F-BD6F-71DA281A0080.html#GUID-04095E9A-50E7-4E5F-BD6F-71DA281A0080"><code>device.getServiceObject()</code></a>.</p> |
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</li> |
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<li id="GUID-0625B45D-A5C9-4ADA-BC21-07963F957A7C-GENIDd0e7905"><a name="GUID-0625B45D-A5C9-4ADA-BC21-07963F957A7C-GENIDd0e7905"><!----></a><p>Define the |
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tasks you want to perform and choose the correct methods for them.</p> |
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</li> |
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<li id="GUID-DBD9997B-CD51-45F9-9ED0-38A98AF08A12-GENIDd0e7910"><a name="GUID-DBD9997B-CD51-45F9-9ED0-38A98AF08A12-GENIDd0e7910"><!----></a><p>Optionally, |
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define how you want the results filtered.</p></li> |
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<li id="GUID-AAB5C193-F848-4B0A-AF03-6BA7425BD10B-GENIDd0e7914"><a name="GUID-AAB5C193-F848-4B0A-AF03-6BA7425BD10B-GENIDd0e7914"><!----></a><p>Define methods |
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to process the results.</p></li> |
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<li id="GUID-F0C3D20F-6F77-4C88-AF35-39DA70DE701B-GENIDd0e7918"><a name="GUID-F0C3D20F-6F77-4C88-AF35-39DA70DE701B-GENIDd0e7918"><!----></a><p>Retrieve the |
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results using the methods from step 2. Use asynchronous methods together with <a href="GUID-C7C3B541-8D28-4DC6-9003-ECF57F26C608.html#GUID-C7C3B541-8D28-4DC6-9003-ECF57F26C608"><code>callback()</code></a>.</p> |
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</li> |
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<li id="GUID-0ABE0CB0-D76C-444B-AE53-0D435B3C6E74-GENIDd0e7927"><a name="GUID-0ABE0CB0-D76C-444B-AE53-0D435B3C6E74-GENIDd0e7927"><!----></a><p>Process the |
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results using the methods defined in step 4.</p></li> |
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</ol> |
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<p>For the complete source of a sample widget that demonstrates how to |
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use this service, see <a href="GUID-11D59F76-EC4C-4297-B262-D5174E826B43.html#GUID-11D59F76-EC4C-4297-B262-D5174E826B43">the |
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full example</a>.</p> |
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</div> |
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</div></div></div><div class="footer"><hr/><div class="copy">© Nokia 2009.</div></div></body></html> |