Declarations
The Declarations tab is the one with the most options. This is where you declare your app’s support for one or more contracts, if applicable. Contracts enable your app to cooperate with another app, or Windows itself, to complete a well-defined task. Every contract has a source that initiates the task and a target that completes it.
Your app can be the source for a contract without doing anything in the package manifest. (It just makes various API calls.) To be the target, however, your app must be activated in a special manner. This is what requires the declaration in the package manifest. Therefore, you can think of the list of available declarations as the list of available contract targets.
Unlike capabilities, contract target ...
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