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The Device Display Object is responsible for acquiring the XML metadata for a device and using it to render that device in the Devices And Printers folder (and in the Device Stage UI if the device supports Device Stage) . The Device Display Object includes the Device Metadata
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706 CHapTER 17 Managing Devices and Services
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Retrieval Client (DMRC), which matches devices to Device Stage metadata packages . The Device Display Object is an internal feature of Windows 7 and is not configurable .
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DEVICE METaDaTa SYSTEM
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The Device Metadata System is new in Windows 7 and provides a process for defining and distributing metadata packages for devices that users connect to their computers . Device metadata is information that enriches the way that devices are displayed by and used with Windows; it consists of two types of metadata:
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Device Display XMl metadata This type of metadata is conceptually similar to sleeve art for music CDs and allows a photorealistic device icon to be displayed along with additional device information, such as manufacturer, model, and description fields . Figure 17-5 shows an example of how Device Display XML metadata can enhance how the device is displayed in the Devices And Printers folder . (The bottom portion of the Devices And Printers window in the figure has been enlarged by dragging its upper border upward .) Device Experience XMl metadata This type of metadata is conceptually similar to a simple Web page and is used by the Device Stage UI . For example, such metadata can enable branding by allowing background and overlay images to be displayed and can display a large, photorealistic image of the device, provide real-time device status information, display a vendor logo and marketing information, and describe what the user can do with the device . See Figure 17-3 earlier in this chapter for an example of how this metadata can be used to display a device that supports Device Stage .
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FIgURE 17-5 Device Display XML metadata can enhance how a device is displayed .
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Understanding Device Installation and Management CHapTER 17
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The device metadata system for Windows 7 delivers device metadata in the form of a package . This package consists of XML files, graphics files, and icon files and typically contains the following:
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PackageInfo.xml Contains the hardware IDs, model ID, timestamp, schemas, and index and locale information for the device DeviceInfo.xml device Contains additional device information with an icon file for the Contains additional information needed by Windows
WindowsInfo.xml
If the device supports Device Stage, the following additional metadata files are included in the device metadata package:
Behavior.xml Defines the layout of the Device Stage UI with any branding graphics included by the vendor Task.xml Defines the tasks that the user can perform with the device using the Device Stage interface with associated icons and commands for these tasks Resource.xml Contains any localized resources needed for the Device Stage interface
note
XML metadata can be associated with a device using either the hardware ID or
model ID of the device, with model ID being the preferred method.
IHVs that create metadata packages for their devices must submit this metadata to Windows Quality Online Services (Winqual) . This must be done to validate the quality of the metadata and digitally sign the package to guard against tampering . Once the package has been signed by Winqual, it can be distributed to users by the following methods:
n n n
Embedding the metadata in the hardware of the device Including the metadata in the vendor s software that is included with the device Installing the metadata on user's computers as an Original Equipment Manufacturer (OEM) add-on Making the metadata available for download from Windows Metadata and Internet Services (WMIS)
When a device is first connected to a Windows 7 computer, Windows acquires the metadata for the device by using the following process:
1. 2. 3.
The DMRC checks the computer's local metadata cache and metadata store for metadata that applies to the device . If no metadata is found for the device, the DMRC visits the WMIS Web site to determine whether any metadata is available for the device . If no metadata is available for the device from WMIS, a standard icon is displayed for the device and descriptive information found in the device's driver is displayed . The
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