The directions module contains classes for creating decorators that allow functions to match objects that were recieved from a specific source (e.g., from the iPhone).
The From_Guzzoni property is a decorator which can be used to allow functions to match objects that are received from the Guzzoni web server.
The From_iPhone property is a decorator which can be used to allow functions to match objects that are received from the iPhone.
Determine if the given direction is found in the list of directions for this function.