URI Mapping
Relying on URIs that include the full path to each page in your app can make your app brittle and difficult to change the physical location of individual pages. If a page is moved, all references to that file must be updated. This can lead to maintainability issues as the size of the project grows.
The URI mapping system of Windows Phone apps allows requests for a URI to be routed to a different URI, and uses a single configuration point for the management of page URIs. Mapped URIs can be made shorter and are, thus, less subject to typographical errors. They also allow the exclusion of technology specific information, such as the .xaml page file extension, making it easier to retarget business logic for different platforms.
To use ...
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