My loose description of periodic (and push) notifications as ‘external’ or ‘decoupled’ is rooted in the observation that content delivered via periodic and push notifications is not typically initiated or provided by the Windows 8 application itself.
With periodic notifications, the Windows 8 application is a subscriber to content hosted at a URI that specifies the XML template for the tile or badge notification (toast is not supported for periodic notifications). Whatever content is at that URI at the regularly recurring time (from 30 minutes to daily) is what the Windows 8 application will use. It’s up to some 3rd party service or application to update that URI’s content at the appropriate interval - providing information on the daily special at a given restaurant, for example.
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